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CertainTeed Vinyl Siding Installation Guide
31
Drop-in foam backer boards
Some drop-in foam backers can restrict the movement of vinyl
siding. Therefore, CertainTeed vinyl siding may not be applied
over any drop-in foam backer other than a contoured drop-in
foam backer designed specifically for each profile.
IMPORTANT: CertainTeed will not accept any responsibility
or liability in the event the drop-in foam backer restricts the
movement of the vinyl. The use, fit, and performance of the
siding backer board is the responsibility of the installer and the
backer board manufacturer.
NOTE: Contoured drop-in foam backer boards are not a
substitute for rigid foam sheathing.
Home improvement projects
You can prepare your current siding surface to receive vinyl siding
in one of three ways:
Strip off old siding and level the wall. If felt paper covers the wall,
you have two alternatives: either strip it off completely or staple
or nail it to create a smooth surface. If there is no solid sheathing
under the old siding, you must apply it as described in the
instructions for New Construction.
Apply rigid sheathing to existing siding to provide a smooth
surface. Nail securely to old siding. Nail evenly to bridge low spots.
NOTE: Failure to establish a smooth, solid surface constitutes
misapplication under the terms of the warranty.
Apply vertical furring to old siding to straighten noticeable surface
unevenness. (See “Tips for applying wood furring.”) Then apply
rigid sheathing, following the instructions presented under New
Construction.
NOTE: For information on installing siding over asbestos and
for historic applications, see page 142.
Tips for applying wood furring
If you are working on an older home with noticeably uneven walls,
you must correct this condition before proceeding. If not corrected
during preparation, this uneven surface will produce a wavy
appearance in siding applied over it.
For best results, space horizontal furring strips 12" on center.
Do not exceed 16". To correct an uneven wall, use furring strips
(and wood shims if necessary) to eliminate low spots.
NOTE: You must apply rigid sheathing over furring.