Installation Guide
17
preparing the wall
Furring strips
Residing Existing 
Structures
Step 1
Nail down any loose boards on 
existing siding, and replace any rotten 
wood as needed. DO NOT INSTALL 
VINYL SIDING OVER ROTTEN 
WOOD. (See Fig. 1)
Step 2
Scrape off loose caulk and any other 
buildup that may interfere with the 
siding installation. Remove all items 
such as gutters, downspouts, and light 
fixtures as needed.
Step 3
Install suitable sheathing, as needed, 
to provide a smooth, flat, and stable 
surface for the installation of the vinyl 
siding. See information previously 
given in this segment for additional 
instructions on subwall protection and 
flashing.
Step 4
Install furring in areas needing 
straightening and leveling. Apply 
rigid sheathing to cover and level the 
furring strips. Do not apply vinyl 
siding directly to furring strips with-
out sheathing, because the siding may 
conform around the furred areas 
causing an uneven appearance. 
(See Fig 2)
Step 5
Window and door casings may need 
additional attention or preparation. 
Depending on vinyl siding moldings 
being used, a window/door casing 
generally needs to extend out from the 
finished subwall sufficiently, to allow 
a J-Channel or similar molding to butt 
to it. In some situations, building out 
the casings, or using special purpose 
moldings such as Window and Door 
Surround may be necessary.
Fig. 1
Fig. 2










