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CertainTeed Vinyl Siding Installation Guide
28
SECTION 6 — Preparing for Horizontal Siding
Preparing Wall Surfaces
Sheathings
In new construction, apply sheathing first, then nail accessories
over it.
The application method you choose determines the width of the
recess opening required. For example, use:
• 1/2" opening when applying accessories over sheathing and
installing siding with a panel projection of 1/2" or less.
• 3/4" opening when applying accessories over sheathing and
installing siding with a panel projection of 3/4" or less.
• 1-1/4" opening when applying accessories first and using
sheathing that’s less than 3/4" thick for sidings with a panel
projection of 1/2" or less. For sidings with a panel projection of
5/8" or 3/4", use a sheathing that is 1/2" thick or less.
New construction
Make sure all studs are straight and true. Correct any
bowed studs.
NOTE: Vinyl siding must be applied over a rigid sheathing that
provides a smooth, flat surface or an underlayment (such as
wood, wood composition, rigid foam or fiber sheathing) that is
no more than 1" thick. Vinyl siding cannot be applied directly
to studs. See the instructions on page 29 for installation over
continuous insulation systems thicker than 1".
If you’re planning to use a conventional house wrap or building
felt, apply according to the manufacturer’s recommendations.
In all cases, however, install the products so they are secured
firmly to the substrate so that they provide a smooth, even
surface for the final siding installation. Make sure sheathing is
fastened securely to studs.
Vinyl siding is an exterior cladding; it is not a complete weather
resistant barrier. Before applying siding, make certain the substrate
is watertight. In order to be protected from precipitation, the
substrate may need to be properly flashed around areas such as
windows, doors, other openings and corners so as to shed water
to the exterior. See page 45 for proper flashing around windows.
The siding alone is not meant to be a watertight barrier.
Vinyl siding cannot be installed on a radius wall.