I-Beam Specifiers & Constructors Guide - Lumberworx

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I-Beam
Specifiers &
Constructors
Guide
Issue 6 – 07/11

2

INDEX





PRODUCT DESCRIPTION & QUALITY ASSURANCE P 3


FLOORING APPLICATIONS P 4
FLOOR JOIST SPAN TABLES P 5—P8
- [Tables 1a & 1b — 1.5kPa Floor Loads] P5
- [Tables 2a & 2b — 2.0kPa Floor Loads] P6
- [Tables 3a & 3b — 3.0kPa Floor Loads] P7
- [Tables 4a & 4b — 5.0kPa Floor Loads] P8



FLOOR DETAILS P 9 — P13
- Floor Layout Example P9
- Fixing Details P10 — 13




FLOOR CANTILEVER DETAILS P 14 — P15
- Balcony Detail P14
- Load Bearing Detail P14
- [Table 5a Load Bearing Cantilever Joists [1.0kPa Snow load]] P15
- [Table 5b Load Bearing Cantilever Joists [2.0kPa Snow load]] P15




WEB HOLE DETAILS - FLOOR JOISTS P 16
- Web Hole Detail P16
- [Tables 6a & 6b —Web Holes] P16




ROOF APPLICATIONS P 17 — 21
- Design Criteria and Rafter Application Diagram P17
- [Table 7 — Rafter Spans] P18
- Rafter Details P19—21



WEB STIFFENERS P 22

HANDLING & STORAGE DETAILS P 22

CHARACTERISTIC I-BEAM PROPERTIES P23
-[Table 8 Properties] P23
-[Beam Profiles] P23







Lumberworx Ltd - PO Box 36723, Merivale, Christchurch 8146
Call Free 0508 - 423 267 (0508 IBEAMS)
Phone 03 349 0515 Fax 03 349 0535
E
-Mail mail@lumberworx.co.nz
Web www.lumberworx.co.nz





I-Beam Specifiers & Constructors Guide Issue 6-07/11

3
Quality Assurance

The purpose of the quality system is to ensure the
o
bjectives of Clause B1 and B2 of the Building Code of
New Zealand are being met in the manufacture of
LumberworX I-beams, being;

B1 Structure
- “To safeguard people from injury”; “To
safeguard people from loss of amenity”; “To protect
other property from physical damage”; (each) caused
by structural failure, and

B2 Durability -
“To ensure that a building will through-
out its life continue to satisfy the other objectives of
the Building Code”. Under B2.3.1 (Performance) of the
Building Code, I-Beams will be required to perform “for
the life of the building, being not less than 50 years”.

The quality system includes:

⇒ Certified Suppliers
⇒ Approved Material Recording
⇒ Pre and Post Assembly Dimensional Checks
⇒ Beam Identification and Traceability
⇒ Complaints & Rectification Procedure
⇒ In-house Structural Shear Testing
⇒ In-house Structural Tension Testing
⇒ Annual Test Equipment Calibration
⇒ Annual Audit



P
roduct Description

The LumberworX I-beam (LIB) is an engineered ‘I’ shaped
wood structural member for use in residential and light
commercial construction.

This guide emphasizes flooring and roofing applications and
review by a design professional is required for uses beyond the
scope of this guide. (See table 8 — p23 for design properties)

The LIB is prefabricated using structural laminated veneer lumber
(LVL) 13.1 flanges to AS/NZS 4357:2005 standard and structural
plywood webs to AS/NZS 2269:2004 standard. These members
are bonded with Resorcinol type structural adhesive to category C
(fully exposed) in 3606:1987.

LumberworX I-beams are identified by their depth and width in
millimeters and are manufactured to achieve a consistent, uniform
product.

⇒ Flanges are the top and bottom timber members being
structural LVL 13.1 to AS/NZS 4357:2005 standard. Both
top and bottom flanges are of the same type and grade.
There are 2 flange widths 63 & 88mm, both being 39mm
thick. Nomenclature for the 2 beam sizes are 65 & 90

⇒ Webs are the vertical element of the LIB and are 9mm
structural plywood to AS/NZS 2269:2004 and F8 grade or
better.

⇒ Adhesive used in all LIB joints is Resorcinol type struc-
tural adhesive to category C (fully exposed) in NZS
3606:1987.

⇒ Four Depths of LIB joists are available. 200mm, 240mm,
300mm & 360mm.

⇒ Beam Lengths are available from 3.0 metres to 9.6 me-
tres in 600mm increments.

⇒ Joist Hangers are a metal shoe fixed to a wall or beam
into which an I-beam sits.

⇒ Rim boards are attached continuously to the ends and
sides of LIB ‘s around the perimeter of a building.

⇒ Web stiffeners are plywood blocks added to the sides of
an LIB web for additional support under concentrated or
bearing loads.

⇒ Squash Blocks are timber members fixed on both sides
at the end of an LIB at the location of concentrated loads
from walls above. Squash blocks are field cut.

⇒ Packing Blocks are packers that fit between the flanges
of an LIB from the web to the flange edge for fixing other
timber members or connectors. For LIB 65 series the
correct measurement is 27mm and for LIB 90 series the
measurement is 39½mm. Packing blocks are field cut.

⇒ Treatment is available to meet the external framing,
ground floor and roof member durability requirements in
NZS 3602:2003. All treated members supplied by Lum-
berworx are treated at a facility approved for the applica-
ble treatment. After cutting or drilling through an LOSP
treated LIB the cut should be repaired with a product such
as Metalex or Osmose “Reseal”.

⇒ Appearance may show adhesive runs or stains

⇒ Nail references in this publication refer to power
driven nails; see NZS 3604:2011 for hand driven al-
ternatives.

Beam Design & BRANZ Appraised

T
he Lumberworx I-Beam has been BRANZ ap-
praised after type testing against The American
Society of Testing and Materials ASTM 5055-02
“Standard Specification for Establishing and
Monitoring Structural capabilities of Prefabri-
cated Wood I-Joists”.












Structural design meets the requirements of the
New Zealand Building Code and the load condi-
tions and deflection recommendations of AS/
NZS 1170 Structural design actions.

I-Beam Specifiers & Constructors Guide Issue 6-07/11

4
Flooring Applications

Recommended Floor Spans
The recommended span for uniformly loaded floor construction has been pre-engineered for each
LumberworX I-beam at various spacings in accord with NZS3604:2011Timber Framed Buildings. The
specific LIB needed for each application is easily determined by selecting the span required and
choosing the LIB that meets the span, dynamic, spacing, and loading criteria.

The spans in the following 4 tables define the recommended span range in metres with a maximum limit
at various joist spacing and under various load conditions.

Provision is made in the spans for the following:

R
ecommended Range
The tables are designed to present the designer with options and flexibility.

Selecting a joist span at the lower end of the range will provide a stiffer floor system with superior
dynamic performance at the range threshold.

Selecting a joist span toward the higher end will provide a satisfactory floor system for all New Zealand
conditions that exceeds the requirements & recommendations of NZS 1170.0. These spans are based on
Span/300 but are limited to 15mm maximum deflection.

Both I-Beam series (65 & 90mm) can be incorporated into one floor system to achieve maximum
flexibility and economy.

Floor Dynamics
The entire span range meets the suggested serviceability limit state criteria contained in NZS1170.0 for
floor dynamics of between 1 & 2mm deflection under a 1kN point load.

It is important to note that floor vibration is a matter of personal perception and the spans within this
document have been determined with typical flooring sheets to meet the suggested NZS 1170.0 criteria.
Other flooring materials may change the floor dynamics, such as AAC (lightweight concrete) type
flooring. It is recognized that increased floor mass reduces the vibration frequency making the vibration
more noticeable, while increased stiffness increases the vibration frequency making it less noticeable.

For this reason joist spacing of 360mm maximum is recommended for AAC type flooring panels .

Spacing
Spans for joist spacing at 300, 360, 400, 450, 480 & 600mm are provided.
Use 300, 400, 480 & 600mm spacing for flooring panels of 2.4m length
Use 300, 360, 450, & 600mm spacing for flooring panels of 3.6m length
Lumberworx recommends the joining of flooring panels over a joist irrespective of the panel type, size
or butting method

Live Loads
Up to 1.5kPa, 2.0kPa , 3kPa & 5.0kPa uniformly distributed loads are provided for.

Typical floor load applications are
1
.5kPa; Domestic dwellings
2.0kPa; Balconies, landings & multi-unit dwellings
3.0kPa; Offices
5.0kPa; Storage (at 4.5kN concentrated Load)

Continuous Spans: The LIB floor joist must span at least two adjacent spans to be continuous. The
minor span must be 60% or more of the major span. The major or longer span is then determined from
the continuous span table. For continuous spans that do not meet this criteria, use the single span table.

Dead Loads
Flooring Loads: the tables provide for both standard timber flooring materials to 40kg/m² [0.40kPa]
and heavier overlay materials, such as a mortar bed with a tiled or slate floor up to 70 kg/m
2
[0.70kPa].
Dead Loads includes LIB joist self weight.

Deflection Limits
The permanent dead load deflection is Span/300 with a maximum deflection of 15mm.

C
oncentrated Loads: No allowance has been made in the following tables for concentrated loads from
load bearing walls above without a corresponding wall aligned underneath. Where there is no wall
aligned underneath a load bearing wall above specific engineering design will be required.





I-Beam Specifiers & Constructors Guide Issue 6-07/11

5
Table 1a
Floor Joist
Single Span Tables

1.5 kPa

Floor Joist Single Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 4.55 — 4.95 4.35 — 4.75 4.20 — 4.60 4.15 — 4.45 4.00 — 4.40 3.55 — 3.95
0.70
4.35 — 4.65
4.10 — 4.40
3.90 — 4.20
3.70 — 4.00
3.60 — 3.90
3.25 — 3.55

LIB 200.90
0.40 4.90 — 5.30 4.65 — 5.05 4.50 — 4.90 4.35 — 4.75 4.25 — 4.65 3.95 — 4.35
0.70
4.65 — 4.95
4.40 — 4.70
4.25 — 4.55
4.10 — 4.40
3.95 — 4.25
3.60 — 3.90

LIB 240.65
0.40 5.15 — 5.55 4.90 — 5.30 4.75 — 5.15 4.60 — 5.00 4.50 — 4.90 4.20 — 4.60
0.70
4.80 — 5.15
4.65 — 4.95
4.50 — 4.80
4.35 — 4.65
4.25 — 4.55
3.90 — 4.20

LIB 240.90
0.40 5.50 — 5.90 5.25 — 5.65 5.10 — 5.50 4.90 — 5.30 4.80 — 5.20 4.50 — 4.90
0.70
5.20 — 5.50
4.95 — 5.25
4.80 — 5.10
4.65 — 4.95
4.55 — 4.85
4.25 — 4.55

LIB 300.65
0.40 5.90 — 6.30 5.60 — 6.00 5.45 — 5.85 5.25 — 5.65 5.10 — 5.50 4.85 — 5.25
0.70
5.55 — 5.85
5.30 — 5.60
5.15 — 5.45
4.95 — 5.25
5.85 — 5.15
4.55 — 4.85

LIB 300.90
0.40 6.30 — 6.70 6.10 — 6.40 5.85 — 6.25 5.65 — 6.05 5.55 — 5.95 5.20 — 5.60
0.70
5.95 — 6.25
5.70 — 6.00
5.50 — 5.80
5.30 — 5.60
5.20 — 5.50
4.90 — 5.20

LIB 360.65
0.40 6.60 — 7.00 6.20 — 6.60 6.05 — 6.45 5.85 — 6.25 5.75 — 6.15 5.40 — 5.80
0.70
6.20 — 6.50
5.90 — 6.20
5.70 — 6.00
5.50 — 5.80
5.40 — 5.70
5.05 — 5.35

LIB 360.90
0.40 7.00 — 7.40 6.70 — 7.10 6.50 — 6.90 6.30 — 6.70 6.15 — 6.55 5.80 — 6.20
0.70
6.65 — 6.95
6.30 — 6.60
6.15 — 6.45
5.90 — 6.20
5.90 — 6.10
5.45 — 5.75

Single Span Two Supports
Continuous Span More than 2 Supports

Minor span must be 60% or more of major span
to use continuous span table for major span
Table 1b
Floor Joist
Continuous Span Tables

1.5 kPa

Floor Joist Continuous Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 5.00 — 5.45 4.80 — 5.25 4.65 — 5.05 4.55 — 4.90 4.40 — 4.80 3.90 — 4.35
0.70
4.80 — 5.10
4.50— 4.85
4.30 — 4.60
4.10 — 4.40
4.00 — 4.30
3.60 — 3.90

LIB 200.90
0.40 5.20 — 5.80 5.15 — 5.55 5.10 — 5.40 4.85 — 5.25 4.75 — 5.15 4.20 — 4.80
0.70
5.15 — 5.45
4.75 — 5.15
4.70 — 5.00
4.55 — 4.85
4.40 — 4.70
4.00 — 4.30

LIB 240.65
0.40 5.70 — 6.10 5.45 — 5.85 5.25 — 5.65 5.10 — 5.50 5.00 — 5.40 4.65 — 5.05
0.70
5.35 — 5.65
5.15 — 5.45
4.95 — 5.25
4.80 — 5.10
4.70 — 5.00
4.35 — 4.65

LIB 240.90
0.40 6.10 — 6.50 5.90 — 6.20 5.65 — 6.05 5.50 — 5.80 5.45 — 5.75 5.05 — 5.35
0.70
5.75 — 6.05
5.45 — 5.75
5.30 — 5.60
5.15 — 5.45
5.00 — 5.30
4.70 — 5.00

LIB 300.65
0.40 6.55 — 6.95 6.20 — 6.60 6.00 — 6.40 5.80 — 6.20 5.65 — 6.05 5.35 — 5.75
0.70
6.10 — 6.45
5.85 — 6.15
5.70 — 6.00
5.45 — 5.75
5.35 — 5.65
5.00 — 5.30

LIB 300.90
0.40 6.95 — 7.40 6.65 — 7.05 6.45 — 6.85 6.25 — 6.65 6.15 — 6.55 5.75 — 6.15
0.70
6.55 — 6.85
6.30 — 6.60
6.05 — 6.35
5.85 — 6.15
5.75 — 6.05
5.40 — 5.70

LIB 360.65
0.40 7.25 — 7.65 6.85 — 7.25 6.70 — 7.10 6.45 — 6.85 6.35 — 6.75 5.95 — 6.35
0.70
6.85 — 7.15
6.50 — 6.80
6.30— 6.60
6.05 — 6.35
5.95 — 6.25
5.55 — 5.85

LIB 360.90
0.40 7.75 — 8.15 7.40 — 7.80 7.20 — 7.60 6.95 — 7.35 6.80 — 7.20 6.45 — 6.85
0.70
7.35 — 7.65
6.95 — 7.25
6.80 — 7.10
6.50 — 6.80
6.50 — 6.70
6.00 — 6.30

I-Beam Specifiers & Constructors Guide Issue 6-07/11

6
Table 2a
Floor Joist
Single Span Tables

2.0 kPa

Floor Joist Single Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 4.35 — 4.75 4.10 — 4.50 4.00 — 4.40 3.75 — 4.15 3.65 — 4.05 3.25 — 3.65
0.70
4.15 — 4.45
3.85 — 4.15
3.65 — 3.95
3.50 — 3.80
3.40 — 3.70
3.00 — 3.35

LIB 200.90
0.40 4.65 — 5.05 4.40 — 4.80 4.25 — 4.65 4.10 — 4.50 4.00 — 4.40 3.60 — 4.00
0.70
4.45 — 4.75
4.20 — 4.50
4.05 — 4.35
3.85 — 4.15
3.75 — 4.00
3.35 — 3.65

LIB 240.65
0.40 4.90 — 5.30 4.65 — 5.05 4.50 — 4.90 4.30 — 4.75 4.25 — 4.65 4.00 — 4.40
0.70
4.75 — 5.00
4.45 — 4.75
4.30 — 4.60
4.15 — 4.45
4.00 — 4.30
3.65 — 3.95

LIB 240.90
0.40 5.25 — 5.65 4.95 — 5.35 4.80 — 5.20 4.65 — 5.05 4.55 — 4.95 4.15 — 4.65
0.70
5.00 — 5.30
4.75 — 5.05
4.60 — 4.90
4.45 — 4.75
4.35 — 4.65
4.00 — 4.30

LIB 300.65
0.40 5.60 — 6.00 5.30 — 5.70 5.15 — 5.55 5.00 — 5.40 4.90 — 5.30 4.55 — 4.95
0.70
5.35— 5.65
5.10 — 5.40
4.95 — 5.25
4.75 — 5.05
4.65 — 4.95
4.35 — 4.65

LIB 300.90
0.40 6.00 — 6.40 5.70 — 6.10 5.55 — 5.95 5.35 — 5.75 5.25 — 5.65 4.90 — 5.30
0.70
5.75 — 6.05
5.40 — 5.75
5.20 — 5.60
5.10 — 5.40
5.00 — 5.30
4.65 — 4.95

LIB 360.65
0.40 6.20 — 6.60 5.90 — 6.30 5.70 — 6.15 5.50 — 5.95 5.40 — 5.85 5.05 — 5.50
0.70
5.95 — 6.25
5.65 — 5.95
5.50 — 5.80
5.30 — 5.60
5.20 — 5.50
4.85 — 5.15

LIB 360.90
0.40 6.70 — 7.10 6.35 — 6.75 6.15 — 6.55 5.90 — 6.35 5.80 — 6.25 5.40 — 5.85
0.70
6.40 — 6.70
6.00 — 6.35
5.90 — 6.20
5.70 — 6.00
5.55 — 5.85
5.20 — 5.50

Single Span Two Supports

Continuous Span More than 2 Supports

Minor span must be 60% or more of major span
to use continuous span table for major span
Table 2b
Floor Joist
Continuous Span Tables

2.0 kPa

Floor Joist Continuous Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 4.80 — 5.20 4.55 — 4.95 4.35 — 4.75 4.15 — 4.55 4.05 — 4.45 3.60 — 4.00
0.70
4.60 — 4.90
4.25 — 4.55
4.05 — 4.35
3.85 — 4.15
3.75 — 4.05
3.35 — 3.70

LIB 200.90
0.40 5.15 — 5.55 4.90 — 5.30 4.70 — 5.10 4.55 — 4.95 4.45 — 4.85 4.00 — 4.40
0.70
4.95 — 5.25
4.65 — 4.95
4.50 — 4.80
4.25 — 4.55
4.10 — 4.40
3.70 — 4.00

LIB 240.65
0.40 5.40 — 5.80 5.10 — 5.55 5.00 — 5.40 4.85 — 5.25 4.70 — 5.10 4.40 — 4.85
0.70
5.20 — 5.50
4.95 — 5.20
4.75 — 5.05
4.60 — 4.90
4.40 — 4.70
4.05 — 4.35

LIB 240.90
0.40 5.80 — 6.20 5.45 — 5.85 5.30 — 5.70 5.15 — 5.55 5.05 — 5.45 4.70 — 5.10
0.70
5.50 — 5.85
5.25 — 5.55
5.10 — 5.40
4.90 — 5.20
4.70 — 5.10
4.40 — 4.70

LIB 300.65
0.40 6.20 — 6.60 5.85 — 6.25 5.70 — 6.10 5.50 — 5.90 5.40 — 5.80 5.00 — 5.45
0.70
5.90 — 6.20
5.65 — 5.95
5.45 — 5.75
5.25 — 5.55
5.15 — 5.45
4.80 — 5.10

LIB 300.90
0.40 6.60 — 7.05 6.30 — 6.70 6.15 — 6.55 5.90 — 6.30 5.80 — 6.20 5.40 — 5.80
0.70
6.35 — 6.65
6.00 — 6.30
5.85 — 6.15
5.60 — 5.95
5.50 — 5.80
5.15 — 5.45

LIB 360.65
0.40 6.85 — 7.25 6.50 — 6.90 6.35 — 6.75 6.15 — 6.55 6.05 — 6.45 5.65 — 6.05
0.70
6.55 — 6.90
6.25 — 6.55
6.05 — 6.35
5.85 — 6.15
5.75 — 6.05
5.35 — 5.65

LIB 360.90
0.40 7.40 — 7.80 7.00 — 7.40 6.80 — 7.20 6.60 — 7.00 6.45 — 6.85 6.00 — 6.40
0.70
7.05 — 7.40
6.70 — 7.00
6.50 — 6.80
6.30 — 6.60
6.15 — 6.45
5.75 — 6.05

I-Beam Specifiers & Constructors Guide Issue 6-07/11

7
Table 3a
Floor Joist
Single Span Tables

3.0 kPa

Floor Joist Single Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 3.90 — 4.30 3.60 — 4.00 3.45 — 3.85 3.20 — 3.65 3.20 — 3.60 2.80 — 3.20
0.70
3.75 — 4.05
3.45 — 3.75
3.20 — 3.60
3.10 — 3.40
3.00 — 3.30
2.75 — 3.00

LIB 200.90
0.40 4.20 — 4.65 3.95 — 4.40 3.80 — 4.20 3.60 — 4.00 3.50 — 3.90 3.10 — 3.50
0.70
4.15 — 4.45
3.80 — 4.10
3.65 — 3.95
3.45 — 3.75
3.35 — 3.65
2.95 — 3.25

LIB 240.65
0.40 4.35 — 4.90 4.15 — 4.65 4.00 — 4.50 3.85 — 4.30 3.80 — 4.20 3.40 — 3.80
0.70
4.35 — 4.65
4.10 — 4.40
3.90 — 4.20
3.70 — 4.00
3.60 — 3.90
3.25 — 3.55

LIB 240.90
0.40 4.70 — 5.20 4.40 — 4.95 4.30 — 4.80 4.15 — 4.65 4.05 — 4.55 3.75 — 4.15
0.70
4.65 — 4.95
4.40 — 4.70
4.30 — 4.60
4.10 — 4.40
3.95 — 4.25
3.55 — 3.85

LIB 300.65
0.40 5.00 — 5.50 4.70 — 5.30 4.55 — 5.15 4.40 — 4.95 4.30 — 4.90 4.05 — 4.55
0.70
5.00 — 5.30
4.70 — 5.05
4.55 — 4.90
4.40 — 4.75
4.30 — 4.65
4.00 — 4.25

LIB 300.90
0.40 5.35 — 5.95 5.05 — 5.65 4.90 — 5.50 4.70 — 5.30 4.60 — 5.20 4.30 — 4.85
0.70
5.35 — 5.65
5.05 — 5.40
4.90 — 5.20
4.70 — 5.05
4.60 — 4.95
4.30 — 4.60

LIB 360.65
0.40 5.50 — 6.15 5.25 — 5.85 5.05 — 5.70 4.85 — 5.50 4.80 — 5.40 4.45 — 5.05
0.70
5.50 — 5.85
5.25 — 5.55
5.05 — 5.40
4.85 — 5.25
4.80 — 5.15
4.45 — 4.80

LIB 360.90
0.40 5.95 — 6.55 5.60 — 6.25 5.40 — 6.05 5.20 — 5.85 5.10 — 5.75 4.75 — 5.40
0.70
5.95 — 6.25
5.60 — 5.95
5.40 — 5.75
5.20 — 5.60
5.10 — 5.50
4.75 — 5.10

Single Span Two Supports
Continuous Span More than 2 Supports

Minor span must be 60% or more of major span
to use continuous span table for major span
Table 3b
Floor Joist
Continuous Span Tables

3.0 kPa

Floor Joist Single Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

480
[mm]

600
[mm]

LIB 200.65
0.40 4.35 — 4.75 4.00 — 4.40 3.85 — 4.25 3.60 — 4.00 3.55 — 3.95 3.10 — 3.50
0.70
4.15 — 4.45
3.80 — 4.10
3.65 — 3.95
3.45 — 3.75
3.35 — 3.65
3.00 — 3.30

LIB 200.90
0.40 4.70 — 5.10 4.45 — 4.85 4.20 — 4.60 4.00 — 4.40 3.90 — 4.30 3.45 — 3.85
0.70
4.60 — 4.90
4.20 — 4.50
4.05 — 4.35
3.80 — 4.10
3.70 — 4.00
3.25 — 3.55

LIB 240.65
0.40 4.80 — 5.35 4.60 — 5.10 4.40 — 4.95 4.20 — 4.70 4.15 — 4.60 3.75 — 4.20
0.70
4.75 — 5.10
4.50 — 4.80
4.30 — 4.60
4.10 — 4.40
4.00 — 4.30
3.60 — 3.90

LIB 240.90
0.40 5.15 — 5.70 4.85 — 5.45 4.70 — 5.25 4.55 — 5.10 4.45 — 5.00 4.10 — 4.55
0.70
5.15 — 5.45
4.80 — 4.15
4.70 — 5.05
4.50 — 4.80
4.35 — 4.65
3.90 — 4.25

LIB 300.65
0.40 5.50 — 6.05 5.15 — 5.80 5.00 — 5.65 4.85 — 5.45 4.75 — 5.35 4.45 — 5.05
0.70
5.50 — 5.80
5.15 — 5.55
5.00 — 5.35
4.80 — 5.20
4.70 — 5.10
4.35 — 4.65

LIB 300.90
0.40 5.85 — 6.50 5.55 — 6.20 5.35 — 6.05 5.15 — 5.80 5.05 — 5.70 4.70 — 5.35
0.70
5.85 — 6.20
5.55 — 5.95
5.40 — 5.70
5.15 — 5.55
5.05 — 5.45
4.70 — 5.05

LIB 360.65
0.40 6.05 — 6.75 5.75 — 6.40 5.55 — 6.25 5.30 — 6.05 5.25 — 5.95 4.90 — 5.55
0.70
6.05 — 6.40
5.75 — 6.10
5.55 — 5.95
5.30 — 5.75
5.25 — 5.65
4.90 — 5.30

LIB 360.90
0.40 6.55 — 7.20 6.15 — 6.85 5.90 — 6.65 5.70 — 6.40 5.60 — 6.30 5.20 — 5.95
0.70
6.55 — 6.85
6.15 — 6.55
5.90 — 6.30
5.70 — 6.15
5.60 — 6.05
5.20 — 5.60

I-Beam Specifiers & Constructors Guide Issue 6-07/11

8
Table 4a
Floor Joist
Single Span Tables


5.0 kPa [4.5kN]

Floor Joist Single Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

LIB 200.65
0.40 3.25 — 3.65 3.00 — 3.40 2.80 — 3.20 2.75 — 3.05
0.70
3.20 — 3.50
2.95 — 3.25
2.80 — 3.10
2.60 — 2.90

LIB 200.90
0.40 3.55 — 4.00 3.30 — 3.70 3.10 — 3.50 3.00 — 3.35
0.70
3.50 — 3.80
3.20 — 3.50
3.05 — 3.35
2.85 — 3.15

LIB 240.65
0.40 3.75 — 4.30 3.55 — 4.00 3.40 — 3.80 3.20 — 3.60
0.70
3.75 — 4.10
3.55 — 3.80
3.35 — 3.65
3.15 — 3.45

LIB 240.90
0.40 4.00 — 4.65 3.75 — 4.35 3.65 — 4.15 3.50 — 3.95
0.70
4.00 — 4.50
3.75 — 4.15
3.65 — 3.95
3.45 — 3.75

LIB 300.65
0.40 4.25 — 4.95 4.05 — 4.70 3.90 — 4.55 3.75 — 4.40
0.70
4.25 — 4.80
4.05 — 4.55
3.90 — 4.40
3.75 — 4.15

LIB 300.90
0.40 4.55 — 5.30 4.30 — 5.00 4.15 — 4.85 4.00 — 4.70
0.70
4.55 — 5.10
4.30 — 4.85
4.15 — 4.70
4.00 — 4.55

LIB 360.65
0.40 4.75 — 5.50 4.45 — 5.20 4.30 — 5.05 4.15 — 4.90
0.70
4.75 — 5.30
4.45 — 5.05
4.30 — 4.90
4.15 — 4.70

LIB 360.90
0.40 5.05 — 5.85 4.75 — 5.55 4.60 — 5.40 4.40 — 5.20
0.70
5.05 — 5.65
4.75 — 5.35
4.60 — 5.20
4.40 — 5.00








Lumberworx recommends
that floors designed to
carry 5.0kPa loads are
supported by joists with
spacings no greater than
450mm centres.

It is also recommended
that plywood to a mini-
mum thickness of 18mm is
used as the flooring mate-
rial on floors designed for
a 5.0kPa loading.
Single Span Two Supports
Continuous Span More than 2 Supports

Minor span must be 60% or more of major span
to use continuous span table for major span

Table 4b
Floor Joist
Continuous Span Tables


5.0 kPa [4.5kN]

Floor Joist Continuous Spans in Metres at Spacing of:

Beam
Size
Flooring
Load
kPa

300
[mm]

360
[mm]

400
[mm]

450
[mm]

LIB 200.65
0.40 3.60 — 4.00 3.35 — 3.75 3.10 — 3.50 2.95 — 3.35
0.70
3.55 — 3.85
3.25 — 3.55
3.10 — 3.40
2.90 — 3.20

LIB 200.90
0.40 4.00 — 4.40 3.65 — 4.05 3.45 — 3.85 3.25 — 3.65
0.70
3.85 — 4.15
3.55 — 3.85
3.35 — 3.65
3.15 — 3.45

LIB 240.65
0.40 4.20 — 4.70 3.90 — 4.40 3.70 — 4.15 3.55 — 3.95
0.70
4.10 — 4.50
3.85 — 4.15
3.70 — 4.00
3.50 — 3.80

LIB 240.90
0.40 4.40 — 5.10 4.10 — 4.75 4.00 — 4.55 3.85 — 4.35
0.70
4.40 — 4.95
4.10 — 4.55
4.00— 4.35
3.80 — 4.10

LIB 300.65
0.40 4.65 — 5.45 4.45 — 5.15 4.25 — 5.00 4.10 — 4.75
0.70
4.65 — 5.25
4.45 — 5.00
4.25 — 4.80
4.10 — 4.55

LIB 300.90
0.40 5.00 — 5.80 4.70 — 5.50 4.55 — 5.30 4.40 — 5.15
0.70
5.00 — 5.60
4.70 — 5.30
4.55 — 5.15
4.40 — 5.00

LIB 360.65
0.40 5.20 — 6.05 4.90 — 5.70 4.70 — 5.55 4.55 — 5.35
0.70
5.20 — 5.80
4.90 — 5.55
4.70 — 5.35
4.55 — 5.15

LIB 360.90
0.40 5.55 — 6.40 5.20 — 6.10 5.05 — 5.90 4.80 — 5.70
0.70
5.55 — 6.20
5.20 — 5.85
5.05 — 5.70
4.80 — 5.50








Lumberworx recommends
that floors designed to
carry 5.0kPa loads are
supported by joists with
spacings no greater than
450mm centres.

It is also recommended
that plywood to a mini-
mum thickness of 18mm is
used as the flooring mate-
rial on floors designed for
a 5.0kPa loading.
I-Beam Specifiers & Constructors Guide Issue 6-07/11

9
General Installation Notes

1. A typical layout of LIB joists is shown above.

2
. Except for cutting to length, LIB flanges must never
be cut, drilled or notched when being used as floor
joists.

3. LIB joists must be protected from the weather prior to
installation

4. Do not use LIB joists in situations where they will be
permanently exposed to weather. They must not be
installed where they remain in direct contact with
concrete or masonry.

5. End bearing length must be at least 45mm. For con-
tinuous span LIB joists intermediate bearing must be
a minimum of 63mm (see conditions detail 4F page
11).

6. LIB joists installed beneath bearing walls perpendicu-
lar to the joist shall have equal depth LIB blocking
panels or squash blocks to transfer gravity loads from
above the floor system to the wall or foundation be-
low.

7. Care must be taken when placing LIB joists as part of
a flooring system in a wet area such as a bathroom.
If adequate moisture protection is not provided by the
flooring material to the joist below, preservative
treatment of the joist may be required.

8. All fasteners used to fix LIB joists must be selected to
ensure they meet the durability requirements of the
NZ Building Code.

9. To avoid splitting the LIB flange, nails shall not be
spaced closer than 100mm using 90 x 3.15 power
driven nails.




10. Ends of LIB joists must be restrained to prevent roll-over. A
suitable Engineered Wood Product is preferred for this pur-
pose. The use of dimensional lumber is not recommended
due to the greater shrinkage likely with dimensional lumber
causing height differences.

LIB blocking panels may also be used as restraints—see
detail F1

11. The top and bottom flange must be restrained at each bear-
ing support. Design is based on continuous lateral support
being provided to the top flange by the floor material.

12. Selected ceiling linings (NZS 3604:2011—Section 13) may
be installed directly to the underside of LIB joists without
the need for ceiling battens.

13. When using metal joist hangers fit in accordance with
manufacturers instructions.

14. Midspan blocking is not required with LIB floor joists.

15. Openings in floors are best framed or trimmed out with
LVL. LVL is compatible with LIB’s and suitably designed joist
hangars. All LVL beams must be specified by an engineer,
or selected and installed in accordance with an LVL manu-
facturers design guide or approved design software.

16. Follow the flooring manufacturers recommendations when
fixing the floor, or alternatively, fix in accordance with NZS
3604:2011.The use of adhesive with screwing is recom-
mended for sheet flooring. With strip flooring it is recom-
mended that nails are driven in a staggered formation
along the length of the I-beam to minimize the risk of split-
ting the flange.



I-Beam Specifiers & Constructors Guide Issue 6-07/11

Holes may be cut for services
See Page 19
Load bearing wall over
Detail F4A
Joist Hangers—Detail F6
Balcony Cantilever
Detail F8
Squash blocks— Detail F2
Some framing details
omitted for clarity
Rimboard—Detail F1
Load Bearing Cantilever
Detail F9

10
Detail F1:
End Restraints

A boundary joist or rim board is attached con-
t
inuously to the ends of LIB joists to prevent
roll-over (NZS 3604:2011). The boundary joist
must match the depth of the LIB to function
correctly.

Dimensional lumber is not compatible with the
new generation of I-beams used in floor con-
struction and should be avoided.

A suitable Engineered Wood Product to AS/
NZS 2269:2004 or AS/NZS 4357:2005 is rec-
ommended as the boundary joist or rim board
material with LIB joists. Join rimboards on an I-
beam or use an internal splice.

Blocking (below) is another approved method
of restraint and is generally applicable where
durability treatment is not required (unless all
members are treated)









I-Beam Specifiers & Constructors Guide Issue 6-07/11
Detail F2:
Squash Blocks to I-Beam Ends

Squash blocks are timber members nailed to each side of the
ends of an LIB at the location of concentrated loads from walls
above. The number of squash blocks is to match the number of
studs in the walls above and below.

If standard dimensional lumber is used, the squash block is to be
cut 1.5mm oversize to ensure the load is carried around the LIB
to the support.
Fix rimboard to top plate
One 90x3.15 nail to each side
of bottom flange at bearing
One 90x3.15 nail to top and
bottom flange
Rimboard (A suitable engineered
wood product is recommended)
LIB blocking or 2/70x35 nogs
60x2.8 nails at
150mm centres
LIB Blocking
Install squash blocks to sides of
LIB under concentrated loads
from above.
The number of blocks to match
the studs above & below
+1.5mm for
squash blocks cut
from standard
timber
Squash blocks can be
field cut from 45mm
timber. Ensure squash
blocks and rim board
cover the top plate

11
I-Beam Specifiers & Constructors Guide Issue 6-07/11
Detail F4:
Intermediate Bearing

The intermediate bearing surface
i
s to be a minimum of 63mm.
(See final paragraph below for
conditions).

At intermediate bearing points
blocking is required between LIB
joists if a load bearing wall is
stacking over a wall below (see
left A). Due to possible differ-
ences in depth and shrinkage,
common framing timber set on
edge is not acceptable as block-
ing.


At points of intermediate bearing
where there is no load bearing
wall above blocking between
joists is not required (see left B).
However the joists must be fas-
tened to the bearing surface at
these points by simple nailing.

Joists joining on a bearer must
bear 45mm and be joined with
strap nail both sides of the top
flange; the flooring sheet must
cover joins in the LIB joist.

With joist centres greater than
450mm web stiffeners are re-
quired on both sides of the LIB at
the bearing location if the bearing
surface is less than 90mm
whether there is a load bearing
wall above or not (see bearing
stiffeners page 25).
Detail F3:
Web Stiffeners to I-Beams
P
arallel Under Walls Above

Web Stiffeners are to be fixed to the sides
o
f an LIB web at the location of concen-
trated loads from walls above.

Where there is a 35mm thick (or thicker)
rimboard parallel to the LIB the web stiffen-
ers need only be fitted to the inside of the
LIB.

Where there is no rimboard or the rimboard
is less than 35mm in thickness, web stiffen-
ers must be fitted to both sides of the LIB
web at the location of any concentrated
load from above.

Detail F4 B
Web stiffener
Rimboard
LIB
Blocking is required
between LIBs under
load bearing walls.
Detail F4 A
90x3.15mm nails at
100mm centres
A load bearing wall above
shall align vertically with the
wall below. Other conditions
such as offset walls are not
covered by this detail
Continuous over
Intermediate wall
Joined on
intermediate wall
Strap nail
One 90x3.15 nail
through each side of the
flange into the support-
ing member

Minimum 45mm bearing
required at joins
Fit web stiffeners
both sides if bearing
surface is less than
90mm and joists
are greater than
450mm apart.

12

Examples are:


⇒ With wide flanged steel UBs shot
fasten or bolt packers to the steel
web and fix blocks to the packers
inside the steel flange as specified
by an Engineer.
Connect LIB with a face
hanger to blocks.




⇒ With narrow flanged UB’s and
channel section bolt a timber
stringer to the steel member.
Engineer to determine number
and size of bolts to match floor
loading and span.
Connect LIB with a face mount
hanger
I-Beam Specifiers & Constructors Guide Issue 6-07/11

⇒ With UB and channel a 45mm a
plate can be top fixed as specified
by an Engineer for use with a top
mount hanger.






⇒ With UBs a LIB can be direct fixed
to the steel flanges, or can be direct
fixed to a packer fitted to the bot-
tom steel flange.

With the latter, fix the packer to the
bottom flange of the steel beam and
nail the bottom LIB flange to the
packer. Drill through the steel
beam flange and restrain the top of
the LIB with two screws.

Without a packer drill and fix with 2
screws per flange direct through the
steel flanges.

An engineer must specify all fixings
which will depend on floor loading
and span.
Detail F5:
Fixing to Steel Beams

There are many variations for connecting LIBs to steel beams.
The size and type of supporting beam and the fixing of any timber to support the LIB
must be specified by an Engineer to match floor loading and span.
Steel Beam
Face mounted I-Joist
hanger. Fix in accordance
with manufacturers instruc-
tions. Web stiffeners only
required for partial hangers
Timber packers
bolted or shot
fastened to steel
web
Fixing blocks cut between
steel flange and fixed to
packers.
Bolt timber to steel beam in
accordance with engineers
specifications. Fix I-joist hanger
to timber in accordance with
manufacturers instructions
LIB
Top mount
hanger to suit
Steel Beam
45mm timber
top plate
Maximum 12mm
cut out of LIB top
flange only
Timber packer
if required

13
Detail F6—Joist Hangers

Joist Hangers are metal shoes fixed to
a wall or beam into which an LIB sits
and come in three typical categories;
face mount, top mount and partial face
mount.

Some special hangers are available for
double LIB’s and skew fixing

Web stiffeners must be used on both
sides of the I-Beam web when partial
face mount hangers are employed (i.e.
when the top flange of the I-Beam is not
restrained by the joist hanger).

When connecting an LIB to a perpen-
dicular LIB a packing block must fill the
space between flange edge and web and
extend 100mm each side of the joist
hanger. Fix block with 6/60x2.8 nails.



I-Beam Specifiers & Constructors Guide Issue 6-07/11
Detail F7—Non Load Bearing Walls Above LIB
Joists

(A) Parallel to Joists


D
wang with minimum 70x35 timber between joists at
600mm centres and nail the bottom plate to the dwangs.
Installation of joist hangers must be in accordance with the manufacturers instructions using the fixings supplied
or recommended. See Mitek or Pryda literature for details.
(C) Blocking for Bracing Wall Support

B
locking may be used to tie down non-load
bearing bracing walls to LIB joists. Fit web stiff-
eners or packing blocks both sides of the I-
Beam and fix blocking with 4 multigrips.

Tie down to blocking in accordance with wall-
board manufacturers instructions.


(B) Perpendicular to Joists


S
imply nail bottom plate to each joist
Top or face mount
hanger
Packing block
Special skew hanger
70x35 dwangs at
600mm centres
Bottom plate of wall
framing nailed to each
dwang


Bottom plate of wall
framing nailed to
each joist
Multigrip fully
nailed both sides
LVL or timber
blocking full depth
Web stiffener or
packing block both
sides of joist
Face mount hanger
Top
mount
hanger


Web stiffener


Partial hanger



14

Detail F8—Balcony Cantilevers
To achieve a step down from dwelling to balcony,
o
utriggers fixed to Lumberworx I-beams can be
used to create balcony platforms.

Fit 90mm wide packing blocks with 5/60x2.8
nails to the LIB web to outer edge of flange
(27mm for 65 series & 39.5mm for 90 series) at
900mm centres from supports.

Select required outrigger material from
NZS3604:2011 and fix to each packing block
with 3/90x3.15 nails. Also nail along bottom I–
beam flange at 300mm centres.

The Lumberworx I-beam span must be a
minimum of 3 x cantilever distance.

The cantilever back span must be a mini-
mum of 1.5 x the cantilever distance.






Detail F9—Load Bearing Cantilevers
(
Supporting Roof and Wall Loads)

LIB’s may be used in cantilever applications sup-
p
orting a concentrated load applied to the end of
the cantilever such as a vertical building offset.

Tables 5a—5d (following pages) are maximum
spans for LIB’s used in this way with the roof
spans and snow loads shown. Other applications
will require further engineering with reinforcing
of the LIB; consult an engineer in these circum-
stances.

The Roof Span is described as the total distance
from outside wall to outside wall of the building
where the cantilever is situated.

The LIB Cantilever spans have been calculated to
accommodate buildings with a flat roof and all
pitched roof types illustrated (A - G) in NZS
3604:2011 (figure 10.3). The calculations pro-
v
ide for an eaves overhang to 600mm maximum.
Consult an Engineer for other roof types.

Note: Governing factors for the Load Bearing
Cantilever tables are:

1. The Cantilever Span must not exceed
33% of the adjacent floor span.
2. Blocking with LIB blocking panels is re-
quired at the cantilever support as
shown.
3. An end trimmer to cantilevered joists is
required as shown
4. Height of wall above the cantilever is
2.4m (maximum)
5. Wall weight above the cantilever is
0.80kPa (maximum)
6. The superimposed dead load is 0.4kPa
maximum
7. Only one story above the cantilever sup-
ported wall is permitted
8. The maximum length of roof eaves is
600mm.
I-Beam Specifiers & Constructors Guide Issue 6-07/11
Packing blocks between LIB web and
outrigger joist fixed with 5/60x2.8
nails. Fix outrigger joist to packing
block with 3/90x3.15 nails. Nail along
bottom LIB flange at 300mm centers
with 90x3.15 nails
Nail end trimmer to each
LIB with 1/90x3.15 nail
into each LIB flange
Solid blocking be-
tween joists over
lower frame
LIB
Outrigger joists and
end trimmers from
NZS 3604
Cross section showing
LIB, packing block and
outrigger on top plate.
Roof Span
Cantilever
Span
Rafter Span
Adjacent
Span
Blocking required
at supports

15
I-Beam Specifiers & Constructors Guide Issue 6-07/11
Maximum cantilever length of floor joist supporting
Wall and a Floor Load of up to 2kPa

LIB
Joist Size

Joist
Spacing
Light Roof with up to 1kPa snow load
and a roof span of:
Heavy Roof with up to 1kPa snow load
and a roof span of:
4.0m 8.0m 12.0m 4.0m 8.0m 12.0m
mm mm mm mm mm mm mm mm
LIB200x65
300
400
450
710
580
510
480
320
70
280
-
-
490
360
260
210
-
-
-
-
-
LIB200x90 300
400
450
800
640
560
540
330
80
310
-
-
550
380
290
220
-
-
-
-
-
LIB240x65
300
400
450

940
790
730
690
510
440
490
300
-
670
540
490
400
130
-
-
-
-
LIB240x90 300
400
450
1070
880
810
800
580
480
560
320
-
770
600
530
460
130
-
110
-
-
LIB300x65
300
400
450
1290
1090
1020
1000
820
730
780
570
480
970
790
730
630
480
390
420
110
-
LIB300x90 300
400
450
1490
1230
1140
1150
930
830
910
650
540
1120
900
820
730
540
430
480
110
-
LIB360x65
300
400
450
1650
1400
1320
1310
1090
1010
1060
860
750
1280
1060
980
880
690
630
620
440
340
Table 5a
Load Bearing
Cantilevered Joists
LIB360x90 300
400
450
1900
1600
1480
1520
1240
1140
1240
980
860
1490
1210
1110
1020
790
700
720
490
370
Maximum cantilever length of floor joist supporting
Wall and a Floor Load of up to 2kPa

LIB
Joist Size

Joist
Spacing
Light Roof with up to 2kPa snow load
and a roof span of:
Heavy Roof with up to 2kPa snow load
and a roof span of:
4.0m 8.0m 12.0m 4.0m 8.0m 12.0m
mm mm mm mm mm mm mm mm
LIB200x65
300
400
450
610
440
380
310
-
-
-
-
-
410
200
-
-
-
-
-
-
-
LIB200x90 300
400
450
700
480
400
340
-
-
-
-
-
460
220
-
-
-
-
-
-
-
LIB240x65
300
400
450

870
660
580
520
330
200
280
-
-
640
440
370
270
-
-
-
-
-
LIB240x90 300
400
450
1020
740
650
600
360
220
310
-
-
750
490
400
300
-
-
-
-
-
LIB300x65
300
400
450
1280
1000
900
850
610
520
560
340
250
970
740
650
550
330
180
270
-
-
LIB300x90 300
400
450
1490
1150
1030
1010
690
580
660
370
270
1120
860
740
640
360
200
290
-
-
LIB360x65
300
400
450
1650
1350
1230
1200
900
790
860
590
490
1280
1060
940
840
570
470
500
270
-
Table 5b
Load Bearing
Cantilevered Joists
LIB360x90 300
400
450
1900
1560
1410
1420
1040
900
1020
670
540
1490
1210
1080
1000
650
530
590
280
-
See Governing Factors Page 14

16
Web Hole Specifications - Floor Joists

One benefit of using LIB’s in residential floor construction is that holes may be cut in the
beam webs to accommodate electrical wiring, plumbing lines and other utilities.

Rules for cutting holes in LumberworX I-beams

⇒ NEVER cut notch or bore through LIB flanges except for docking to length.

⇒ NEVER cut holes larger than 40mm in a cantilever span.

⇒ NEVER cut any holes within 150mm of the edge of a support.

⇒ All holes should be centered on the centerline of the beam. In any event the
edge of a hole must be no less than 10 mm from the flange.

⇒ All holes shall be cut in a tradesman like manner and not over cut.
TABLE 6a - ROUND HOLES

I-Beam
Size

Both 65 & 90
Series
Min. distance from edge of hole to inside face of nearest
support
Round Hole Size (mm)
40 60 80 110 125 150 175 200 250
200 Deep 150 300 750 1300 NA NA NA NA NA
240 Deep 150 300 600 750 1300 1650 NA NA NA
300 Deep 150 300 575 850 1050 1350 1800 2300 NA
360 Deep 150 300 300 450 650 900 1200 1450 2000
TABLE 6b - SQUARE OR RECTANGULAR HOLES

I- Beam
Size

Both 65 & 90
Series
Min. distance from edge of hole to inside face of nearest
support
Square or Rectangular* Hole Size (mm)
35 50 70 100 110 130 150 175 220
200 Deep 150 300 750 1300 NA NA NA NA NA
240 Deep 150 300 600 750 1300 NA NA NA NA
300 Deep 150 300 575 850 1050 1350 1800 2300 NA
360 Deep 150 300 300 450 650 900 1200 1450 2000

How to Use These Tables

1. Identify the column that meets or
e
xceeds the required hole size.

2. Identify the LIB joist being used.

3. Scan horizontally until you intersect
the column that contains the hole
size required. This value is the re-
quired minimum distance from the
edge of the hole to the inside face of
the nearest support.

4. Multiple holes require spacing of
twice the length/diameter of the
largest hole.

5. A MAXIMUM of three holes per span
except diametres 60mm or less, or
squares 50mm or less.

6. Data applies for joists not supporting
offset load bearing and with a maxi-
mum of 1.8kN concentrated live load

7. Distances based on maximum loads
the joist can support.

8. Tables 6a & 6b can be used for both
65 & 90 series LIBs at spacings of
600mm or less.




* Rectangular holes are based on the measurement of the longest side.
Allowable Web Holes
I-Beam Specifiers & Constructors Guide Issue 6-07/11

17
Design Criteria


D
ead Load

Two loadings are provided at:
Light Roof and ceiling @ 40 kg/m²
Heavy Roof and ceiling @ 90 kg/m²

Design Deflection Limits

Permanent Load - Span/300 or 20mm whichever is
less

Snow Loads

The following Snow Loads are provided for:
Up to 1.5kPa snow load
Up to 2.0kPa snow load
Snow loads mean ground snow loads
(NZS3604:2011 15.2.1)
Refer to NZS3604:2011 for snow zones and
altitudes to determine loading.




Wind Zones

All wind zones from Light to Extra High from
NZS 3604:2011 are provided for (excluding lee
zones, escarpments etc).

Roof Pitch

Table 7 applies to roofs with pitches up to 40º

Overhang Limits

Overhang is limited to 33% of adjacent rafter
span or 600mm whichever is less.

Ceiling Requirement

A ceiling or soffit must be either direct fixed to
the underside of the rafters, or to battens
which are direct fixed on the underside of the
rafters.

Durability

Timber treatment is available to meet roof
framing durability requirements of NZS
3602:2003.


Roof Applications

LIB’s are well suited for rafter applications for flat and pitched roofs.

The spans in Table 7 have been calculated for flat roof applications (less than 10º pitch) and are suitable
for pitched roof applications
I-Beam Specifiers & Constructors Guide Issue 6-07/11
Hip connection details
90x45 attached
outrigger detail

Detail R5
Rafter Fixing/Tie
Down.
Detail R1
Rafter to ridge beam or
roof beam connection

Detail R3
Ridge over detail

Detail R4
Rafter flush detail

Detail R4
Some framing
details omitted
for clarity
Gable end rafter
detail

Detail R2

18
[*]Wind Zones Exclude Lee Zones, Escarpments etc

⇒ The above spans may be increased by 10% for light roof, up to 1.5kPa snow loads and all wind zones up to high.
⇒ The above spans may be increased by 5% for light roof, up to 1.5kPa snow loads and very high wind zone.
⇒ The above spans cannot be increased for heavy roof loads to take account of lower wind zones.
⇒ The above spans cannot be increased for 2.0kPa snow load to take account of lower wind zones.
⇒ The above spans [including those arrived at by the multipliers stated] can be increased by 10% for rafters continuous over
2 or more spans. No minor/major proportions apply to continuous rafters.
I-Beam Specifiers & Constructors Guide Issue 6-07/11

Table 7
S
ingle Rafter Spans
Maximum [Single] Rafter Spans in metres
a
t spacings shown below

Up to 1.5kPa Snow load

Up to 2kPa Snow load
Roof
Weight
Wind Zone
[*]
I-Beam Size 450
[mm]
600
[mm]
900
[mm]
1200
[mm]
450
[mm]
600
[mm]
900
[mm]
1200
[mm]


Light


All
200x65
5.4
4.8
4.1
3.6
5.4
4.8
4.1
3.6
200x90 6.0 5.3 4.53 3.9 6.0 5.3 4.5 3.9


Light


All
240x65
6.2
5.7
4.8
4.3
6.2
5.7
4.8
4.3
240x90 6.7 6.2 5.3 4.7 6.7 6.2 5.3 4.7


Light


All
300x65
7.1
6.6
5.8
5.2
7.1
6.6
5.8
5.1
300x90 7.7 7.1 6.3 5.7 7.7 7.1 6.3 5.7


Light


All
360x65
8.0
7.3
6.5
6.0
8.0
7.3
6.5
5.7
360x90 8.5 7.9 7.0 6.4 8.5 7.9 7.0 6.4


Heavy


All
200x65
4.7
4.1
3.5
3.0
4.7
4.1
3.5
3.0
200x90 5.1 4.6 3.8 3.3 5.1 4.6 3.8 3.3


Heavy


All
240x65
5.5
4.9
4.1
3.6
5.5
4.9
4.1
3.6
240x90 6.0 5.4 4.5 3.9 6.0 5.4 4.5 3.9


Heavy


All

300x65
6.4
5.9
5.0
4.4
6.4
5.9
5.0
4.4
300x90 6.9 6.3 5.5 4.8 6.9 6.3 5.5 4.8


Heavy


All
360x65
7.2
6.6
5.8
5.2
7.2
6.6
5.7
4.8
360x90 7.7 7.1 6.3 5.6 7.7 7.1 6.3 5.3

19
Roof Fixing Details

Detail R1
—Rafter Fixing/Tiedowns

Fixing Rafters to top plate.
Pre drill and screw down with
75mm 14gauge type 17 screw each
side, or, strap over with mild steel
strap as shown with 6/30x3.15 nails
to each end of strap.









Detail R2
—Gable end details.

Fixing outriggers to LIB rafters.
Fix Web stiffeners to each side of
LIB and fix outriggers per NZS3604













Detail R3
—Rafter to Ridge/Roof
Beam Connection Details

Fixing LIB rafters to ridge beam,
roof beam or stringer.
Fit web stiffener to both sides of LIB
and connect LIB to supporting
member with a suitable connector .
Strap over with steel strap or cy-
clone tie as wind uplift restraint per
Detail R1.














I-Beam Specifiers & Constructors Guide Issue 6-07/11
2/90x3.15 nails
One each side
27x0.6 or 25x0.8 mild steel
galvanized strap, cyclone ties,
looped over rafter and nailed to
supports using 6/30x3.15 nails
to each end

Predrill LIB rafter flange 6.0mm
to prevent splitting and fix to
bearing plate with 2/14 gauge
x75 type 17 screws - one each
side.

Pitching plate must be fixed down
to top plate using a similar or
equivalent hold down.

Minimum bearing to be 45mm
Fascia connection
See detail R7
Note: Similar connections
may be used for high/
opposite ends

Outriggers to suit roof load and
wind criteria from NZS3604
Fly rafter
Some framing
omitted for clarity
LIB
Packing Block fixed to
LIB with 5/75x3.06
nails.
Fix outriggers to LIB in
accordance with
NZS3604
Gable end wall frame
Load bearing wall frame
Beveled web stiffeners
both sides of web
Ridge or roof beam
Connector and tiedowns to suit roof
load, wind zone, snow load and rafter
spacing. Refer to Pryda or Mitek
literature or consult an engineer.
Depending on circumstances multi-
grips, concealed purlin cleats, nail on
angles, diagonal cleats are possible
options

20




Detail R4
—Rafter to Rafter Join
Over Wall Details

Fixing ends of LIB rafters that join
on intermediate walls.
Fit 300x25mm strap with
6/30x3.15 nails to each side of
join.
Ensure bevelled plate is used for
correct bearing of LIB




I-Beam Specifiers & Constructors Guide Issue 6-07/11
Detail R5
—Outrigger details.

Fixing Outriggers to LIB rafters.
Pack the LIB web flush with the flange
edge at 600mm centres maximum. Fit
the 90x45 outrigger with a maximum
overhang of 600mm and with backspan
1½ times overhang. Fit squash block
under outrigger for support.
Detail R6
—Flush Rafter Detail

Finishing LIB rafters flush with the outer wall.

Plumb cut the rafter and fit a (minimum) 25 mm
plywood block bevel cut 200mm back on the
rafter, both sides.
Note: Same fixing
applies to skillion
rafters joined on
intermediate wall
300x25mm strap
with 6/30x3.15
nails to each
rafter
Attach beveled plate to
framing with
1/90x3.15 nail at
400mm centres
Fix rafter to supports
in accordance with
Detail R1
600mm
maximum
Packing Blocks at
600mm maximum
fixed with 5/60x2.8
nails
90x45 outrigger fixed
with 90x3.15 nails at
100mm centres along LIB
flange and into packing
blocks. Backspan to be
1½ x overhang.
90x45 squash block
under outrigger

Pitching plate
or wedge
25mm plywood cut to
suit bevel end of
rafter.
Attach each side with
6/60x2.8 nails
200mm
600mm maximum

21


Detail R7
—Rafter Overhang Details

LIB rafters can be finished with an
horizontal or sloping soffit.

In both cases the rafter must bear
fully on the LIB bottom flange. Use
pitching plate or wedge. Do not
birds mouth LIB rafters.

With the horizontal soffit, cut the
bottom of the LIB to desired fascia
depth and support the bottom of the
LIB with (minimum) 25mm plywood
cut to (minimum) 70mm wide on
both sides of the web

With the sloping soffit fit web stiff-
eners to fix the fascia






I-Beam Specifiers & Constructors Guide Issue 6-07/11
Detail R8
—Hip Detail

Fitting LIB rafters to a hip rafter or
beam.

Fit 25mm plywood for 200mm from the
connecting end on both sides of the LIB
rafter.

Connect with a nail-on plate with a
minimum of 8/30x3.15 nails to each
member










Detail R9
—Joist Hanger Detail

LIB rafters can be supported by pro-
p
rietary I-joist hangers in flat roof
situations.

When using hangers with rafters, tie
downs must be used as wind uplift
restraints. Proprietary I-joist hangers
are designed for gravity loads and do
not cater for uplift forces.

Nail down with 6/30x3.15 nails to each
end of strap or cyclone tie.
Fix 70x25 plywood cleats
(one each side) using two
rows of 60x2.8 nails at
100mm centres each side
See fixing detail R1
600mm maximum
Fix fascia in
accordance with
NZS3604
600mm maximum
Fix fascia in
accordance with
NZS3604
Fix 70x25mm plywood
cleats (one each side)
using two rows of 60x2.8
nails at 100mm centres
each side to fix fascia
See fixing detail R1
Pitching plate
Pitching plate
LIB
Hip Beam
Fix LIB to hip beam with nail
on plate and a minimum of 8
nails per member
Fix 200mm of 25mm ply-
wood each side with a
group of 6/60x2.8 nails
27x0.6 or 25x0.8 mild steel
galvanized strap or cyclone ties,
looped over rafter and nailed to
supports using 6/30x3.15 nails
to each end
Joist Hanger

22

Storage and Handling Details

⇒ Always store LumberworX I-beams vertically, level and in bundles
preferably on bearers at no greater than 3m centers.

⇒ Always protect LumberworX I-beams from the weather.

⇒ Always keep bundled units intact until time of installation.

⇒ Always take care not to damage Lumberworx I-beams with fork-
lifts or cranes.

⇒ NEVER stack LumberworX I-beams on their side! Always stack
and handle beams in the upright position.

⇒ NEVER store LumberworX I-beams in direct contact with the
ground.

⇒ NEVER USE OR FIELD REPAIR A DAMAGED LumberworX I-
beam
Web Stiffeners

W
eb stiffeners are blocks of plywood added to
the sides of an LIB web for additional support
under concentrated or bearing loads.

LIB’s used in accordance with the span tables in
this guide do not require stiffeners unless:

(1) The sides of joist hangers (eg partial face
hangers) do not support the top flange of
the I-beam to prevent torsional buckling, or
(2) Connections through the web area are nec-
essary, or
(3) There are concentrated loads from girder
trusses or lintels above.



Stiffeners are placed between the flanges and against the web.
When used at end bearings the stiffener should be installed tight
against the bottom (or ‘bearing’) flange of the I-beam, but with a
3-6mm gap between the top of the stiffener and the bottom of
the top flange.

When used to stiffen the web under a concentrated load, the
stiffener is installed tight under the top (or ‘load’) flange, with a
3-6mm gap between the bottom of the stiffener and the top of
the bottom flange.

Stiffeners can be supplied with LIB joists or field cut on the job.
The minimum web stiffener size for all LIB’s is 21mm thick x
90mm minimum width.


Concentrated Load
Bearing Stiffeners
I-Beam Specifiers & Constructors Guide Issue 6-07/11
3—6mm gap
Tight joint
No gap
3—6mm gap
3—6mm gap
Fix web stiffeners with
5/60x2.8 nails fully
penetrating the three
members (2 stiffeners
plus LIB web), or
longer nails to com-
pletely penetrate the
3 members if thicker
web stiffeners are
employed.

Alternatively use
5/60x28 nails from
each side with thicker
web stiffeners.

23

Table 8
Properties

CHARACTERISTIC PROPERTIES
39mm LVL E13.1 Flange & 9mm F8 Ply Web

LumberworX
I-Beam

Joist
Depth
(mm)
Flange
Width
(mm)
Joist
Weight
(kg/m)
øM
x
(kNm)
øV
x

(kN)
EIx
(kNm²)

G
w
A
w
/F
N x 10
6


LIB 200.65
200
63
3.4
8.1
13.18
438
0.886
LIB 200.90 200 88 4.5 11.3 13.18 606 0.906
LIB 240.65
240
63
3.6
10.6
12.24
687
1.167
LIB 240.90 240 88 4.7 14.7 12.24 949 1.197
LIB 300.65
300
63
3.9
14.6
16.07
1179
1.598
LIB 300.90 300 88 5.0 20.0 16.07 1617 1.643
LIB 360.65
360
63
4.2
18.8
15.18
1819
2.035
LIB 360.90 360 88 5.3 25.6 15.18 2481 2.097

Symbols

øM
x
Design Bending strength of section for bending about
the x-axis.

øV
x
Design Shear strength of section for shear force in the
y direction.

EI
x
Rigidity in bending about the x-x axis.

G
w
A
w
Shear rigidity of section for shear force in the y direction.

F Form Factor
Materials and Tolerances

Materials
⇒ 63 x 39mm LVL E13.1 Flange to AS/NZS 4357:2005
⇒ 88 x 39mm LVL E13.1 Flange to AS/NZS 4357:2005
⇒ 9mm F8 Structural Plywood Web to AS/NZS 2269:2004
⇒ Resorcinol type structural adhesive to category C
NZS 3606:1987.
Deflection
(Bending Deflection + Shear Deflection)

F
or a uniformly distributed load w, over a span L:

Y=k
2
(5wL
4
/ 384EI
x
+ wL
2
/ 8G
w
A
w
/F)

For long duration loads k
2
= 2
(Ref. NZS 3603:1993)

Capacity Reduction Factors

T
he capacity reduction factor ø= 0.9
(Ref. NZS 3603)

Manufacturing Tolerances
Camber Maximum 1mm per meter
Depth +2mm, -0mm
63
88
63
63
63
88
88
88
39
122
200
39
162
240
39
222
300
39
282
360
9
9
9
9
9
9
9
9
LIB200.65 LIB200.90 LIB240.65 LIB240.90 LIB300.65 LIB300.90 LIB360.65 LIB360.90
I-Beam Specifiers & Constructors Guide Issue 6-07/11