Craftsman CTS205 User Manual

Page of 149
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.