Estimating the Cost for the

Estimating the Cost for the
Concrete Pad

Concrete Estimating

•
Common Uses of Concrete

•
Reinforcing Bar

•
How Much Will the Concrete Cost?

•
Estimating the Cost of a Pad

•
Cost Estimate

•
Cost Estimator

Common Uses of Concrete

•
Foundations and footings

•
Driveways and sidewalks

•
Floors

•
Retaining walls

•
Piers

•
Columns

Reinforcing Bar

Concrete has high compression strength, yet poor
tensile strength. Rebar is added to increase the
tensile strength.



Reinforcing Bar

Rebar is also used to pin one structural element to
an adjacent element.

How Much Will the Concrete Cost?

Concrete is sold by volume and measured in cubic
yards


(yd
3
).

Estimating the Cost of a Pad


Pad size = 16 ft x 18 ft floor




4 in. thick

•
Convert all units to ft

16 ft, 18 ft, .333 ft

•
Calculate volume (L x W x
t
)


•
Convert ft
3

to yd
3







ft ft.ft ft

3
16 18 333 96


3 3
(27 ft 1yd )
 
yd
ft. yd say 4.0 cu. yd
ft
3
3 3
3
1
96 3 55
27
Estimating the Cost of a Pad

Concrete is typically sold in increments of ½ yd
3


$98/ yard
3

x 4.0 yards
3

= $392


Estimating the Cost of the Pad

Rebar

•
Placed every two feet
(max.) on a grid

•
Sold in 10 ft lengths

•
Must be lapped 6 in. to
maintain strength

•
Maintain a 3 in. edge
distance


6 in. lap

3 in. edge dist.

Estimating the Cost of the Pad

Rebar





(19) 10 ft bars

How many 10 ft pieces of
rebar are needed?

(9) 8 ft bars
(10) 6 ft bars
38

3 in. edge dist.

6 in. lap

Estimating the Cost of the Pad

Rebar

•
Each piece of #4 rebar
costs $4.78.

38 x $4.78 = $181.64


Concrete $392.00
Rebar +$181.64
Total $573.64
Other associated costs
include material for forms,
gravel, and labor.

Cost Estimate

•
A forecast of the cost of a future project

•
Prepared at different levels of a project

–
Conceptual Design

–
Construction Documents

–
Bid Phase


•
Includes

–
Quantity take
-
off


− Subcontractor quotes

–
Material costs



− Indirect costs

–
Labor rates and costs

− Profit margin

–
Equipment costs

•
Completed with cost estimating software

Cost Estimator

•
Specialize in developing cost information for
building projects

•
Most employed in construction industry

•
Most have gained experience through working in
building construction industry

•
Employed by

–
Owner

–
Project manager

–
Construction Contractor

–
Design professional

•
May be discipline specific (electrical, structural, etc.)



Concrete Estimating

•
Common Uses of Concrete

•
Reinforcing Bar

•
How Much Will the Concrete Cost?

•
Estimating the Cost of a Pad

•
Cost Estimate

•
Cost Estimator

Image Resources

Microsoft, Inc. (n.d.).
Clip art
. Retrieved March 18, 2009, from
http://office.microsoft.com/en
-
us/clipart/default.aspx