Installation Instructions
Allura Fiber Cement Siding Installaon Manual
37
1. Strip off the old siding and level the wall. If there is felt under the old siding, either
nail it securely to the wall or strip it off completely. If there is no solid sheathing
under the siding, you will have to install it.
OR
2. Apply rigid sheathing over the old siding. Nail it securely and evenly, taking care to
bridge the low spots.
OR
3. Nail vertical furring on top of the old siding. Apply rigid sheathing to the furring.
Stucco
If you are applying siding to stucco, you will have to create an even, solid surface to
attach the siding to.
1. Carefully chip the high spots off the stucco. Be careful not to crack the stucco.
2. Fasten 1” x 4” furring strips, 16” on center, over the stucco.
Use ring-shanked nails or screws, and attach the fasteners to the studs according to
local code requirements.
Concrete Block (CMU) and Poured Concrete Walls
Fiber Cement Lap siding may be installed over concrete masonry or poured concrete
walls. When you install fiber cement over concrete walls, you must first install 1” x 3”
furring strips. The suitability and methods of attaching exterior cladding products must
comply with all applicable national, state, and local building codes. Always check with
your local building inspector for the applicable codes.
Recommended Fastening Methods for Installing Fiber Cement Lap Siding
over Concrete Block (CMU) or Poured Concrete Walls
Spacing Fastener Fastening Method
2
Allowable
Wind Load
1
12” o.c.
rooing nail
double HD galvanized
it ead
Blind nailed into furring 20.0 psf, 90 mph
8” o.c.
rooing nail
double HD galvanized
it ead
Blind nailed into furring 39.0 psf, 125 mph
1
Based on “B” exposures up to 30’ in accordance with 2009 IBC/IRC, Wall Zone 5, Effective
Wind Area 10, Importance Factor 1.0.
2
Selection of furring and attachment to the CMU or concrete wall must be in accordance with
applicable building codes and be able to resist all loads transferred from the siding.