These formulas apply for both horizontal and vertical installations.
NOTE: When estimating for a large project, you may want to add a waster allowance of 10 percent to the totals for siding, soffit and accessories.
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Rectangular wall surfaces
Measure height (excluding gables). Measure width
(including doors and windows).
_____________ x _____________ = _____________
(height) (width) (surface area)
Repeat for remaining walls.
Triangular gable end surfaces
Measure height at center (add 1' to allow for waste).
Measure width and divide by half.
(height) (1/2 width) (surface area)
Repeat for remaining gables.
NOTE: Lower pitch roofs will produce more waste than higher pitch roofs.
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Upper wall of gambrel house
Divide the upper wall of a gambrel house as shown in the illustration. Then use the following formulas:
1/2 (B + C) x H = ___________
1/2 C x D = ____________
Add these figures to get total area: ____________
Repeat for remaining gambrel surfaces.
Dormer sides
Measure height of dormer (add 1' to allow for waste).
Use the following formula:
_____________ x _____________ = ____________________
(1/2 height) (1/2 width) (surface area, 1 side)
____________________ x 2 = _________________________
(surface area, 1 side) (total dormer surface area)
Repeat for all dormers.
Soffit
Measure width of eave to be covered. Measure length of eave.
_____________ x _____________ = _____________
(width) (length) (surface area)
Repeat for remaining eaves.
Porch Ceiling
Measure length of porch area to be covered and width of porch.
_____________ x _____________ = _____________
(length) (width) (surface area)
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