Math Formulas Flashcards by Orel Contracting

Q

Square Feet

A

L x W

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Q

Brick

A

SF x 7

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Q

Block

A

SF x 1.125

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Q

Square Yard

A

(L x W) / 9

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Q

Cubic Yard

A

(L x W x D) / 27

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Q

Rebar Quantity

A

= form - cover / O.C. spacing + 1

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Q

Quantity stud

A

= L / O.C. spacing + 1

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Q

Linear Feet

A

= end to end measurement

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Q

Rough Opening

A

= Door size + 2 1/2”

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Q

Header

A

= Door size + 5 1/2”

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Q

Run

A

= half of the span

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Q

Gable Ht

A

= Rise x Run / 12

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Q

Common Rafter

A

= (Run O.H.) x Factor

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Q

Roof Area

A

= (L+O.H) x (W + O.H.) x (factor)

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