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Building Material Calculation Formulas

By Warren Goodrich
Building Material Calculation Formulas

The following are formulas to calculate the amount of material you'll need for a variety of building projects.

Concrete
Width x Length x Height, divided by 27 = number of yards of concrete needed

Foundation Masonry Block
8" high / 16" long / 3/8" mortar normal joint height.

Roofing
Width x length, divided by 100 = number of squares of shingles needed

Siding
Width x Height, divided by 100 Square Feet = number of squares of siding needed

Carpet
Width of room x length of room, divided by 9 = number of square feet needed for room.

Wood Siding
Width of board minus distance of lapping = coverage of wood siding per board

Width of area to be sided x height of area to be sided, divided by coverage calculated above = lineal feet of siding you need.

Brick
7 bricks = one square feet of coverage

Width of area to be covered x height of area to be covered, divided by 7 = number of bricks needed.

Elevation Conversion
Elevation measured in 10ths per foot. 1 of elevation = one foot or 12" equals one foot.

Normal measurement 12 inches per foot.

Convert Elevation to Inches
One Foot of Elevation measurement equals 1.2 inches of normal measurements.

Common Terms Used
Board feet = (thickness (in inches) x width (in inches) x length (in inches)) divided by 12 Lineal feet = length only of board.

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