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CertainTeed Vinyl Siding Installation Guide
25
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. Measure width
of porch.
_____________ x _____________ = _____________
(length) (width) (surface area)