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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 115.
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 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.
When covering over masonry or bricks, it’s better to use
1"x 3" furring. For best thermal performance, install a
minimum of 1/4" foam over furring strips.
Furring and/or foam is also used below eaves and windowsills
to maintain correct slope angles when siding panels must be
cut to a narrower dimension to fit.
Similarly, when panels are cut to fit over doors or
windows, furring and/or foam is used to establish the
correct slope angle.
22
Wolverine Fit and Finish Installation Guide
sill
undersill trim
J-channel
siding
siding
undersill trim
J-channel
sill
furring strip
furring strip