Craftsman CTS205 manual Drop-in foam backer boards, Home improvement projects

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.

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