Download - Estimating the Cost for the Concrete Pad
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Estimating the Cost for the Concrete Pad
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Concrete Estimating
• Common Uses of Concrete
• Reinforcing Bar
• How Much Will the Concrete Cost?
• Estimating the Cost of a Pad
• Cost Estimate
• Cost Estimator
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Common Uses of Concrete
• Foundations and footings
• Driveways and sidewalks
• Floors
• Retaining walls
• Piers
• Columns
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Reinforcing Bar
Concrete has high compression strength, yet poor tensile strength. Rebar is added to increase the tensile strength.
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Reinforcing Bar
Rebar is also used to pin one structural element to an adjacent element.
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How Much Will the Concrete Cost?
Concrete is sold by volume and measured in cubic yards (yd3).
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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 ft3 to yd3
ft ft . ft ft 316 18 333 96
3 3( 27 ft 1yd )
yd
ft . yd say 4.0 cu. yd ft
33 3
3
196 3 55
27
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Estimating the Cost of a Pad
Concrete is typically sold in increments of ½ yd3
$98/ yard3 x 4.0 yards3 = $392
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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
. ed
ge d
ist.
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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
. ed
ge d
ist.
6 in. lap
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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.
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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
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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.)
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Concrete Estimating
• Common Uses of Concrete
• Reinforcing Bar
• How Much Will the Concrete Cost?
• Estimating the Cost of a Pad
• Cost Estimate
• Cost Estimator
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Image Resources
Microsoft, Inc. (n.d.). Clip art. Retrieved March 18, 2009, from http://office.microsoft.com/en-us/clipart/default.aspx