Installation Instructions

CertainTeed Vinyl Siding Installation Guide

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.