Installation Instructions

CertainTeed Vinyl Siding Installation Guide

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.