Transcript 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.

Estimating the Cost for the
Concrete Pad
Concrete Estimating
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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
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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 (yd3).
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)
16ft 18ft .333ft   96ft 3
• Convert ft3 to yd3(27 ft
3
96 ft 
1 yd3
27 ft 3
3
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1 yd )3
 3.55 yd3 say 4.0 cu. yd
Estimating the Cost of a Pad
Concrete is typically sold in increments of ½ yd3
$98/ yard3 x 4.0 yards3 = $392
Estimating the Cost of the Pad
• 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.
Rebar
Estimating the Cost of the Pad
Rebar
3 in. edge dist.
(19) 10 ft bars
(9) 8 ft bars
(10) 6 ft bars
How many 10 ft pieces of
rebar are needed?
38
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
Total
+$181.64
$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
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Quantity take-off
Material costs
Labor rates and costs
Equipment costs
− Subcontractor quotes
− Indirect costs
− Profit margin
• 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
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Owner
Project manager
Construction Contractor
Design professional
• May be discipline specific (electrical, structural, etc.)
Concrete Estimating
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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