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CertainTeed Vinyl Siding Installation Guide
24
Section 5 — Estimating
Siding
Use the illustrations and formulas below and enter totals on
the estimating form on page 27. These formulas apply for both
horizontal and vertical installations.
NOTE: When estimating for a large project, you may want to
add a waste allowance of 10 percent to the totals for siding,
soffit and accessories.
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.
_____________ x _____________ = _____________
(height) (1/2 width) (surface area)
Repeat for remaining gables.
NOTE: Lower pitch roofs will produce more waste
than higher pitch roofs.