Installation Instructions
Allura Fiber Cement Siding Installaon Manual
66
Before You Begin
Review the general cutting, fastening, and wall preparation instructions in the Cutting,
Fastening, and Wall Preparation sections (page 23-38).
Remember:
Cut fiber cement soffit face down with mechanical shears or a circular saw. Cover
the saw table with carpet or another soft material to avoid marring the surface of
the soffit.
Prime or paint all field-cut edges of fiber cement soffit. Do not prime or paint the
back of the soffit panel.
Refer to instructions on butt joints and trim locations for specific requirements.
Be sure to install all soffit with the proper textured, sealed, or painted surface
facing out.
Do not over drive the fasteners. When a fastener is driven below the surface of the
soffit, its holding power is reduced.
Irregularities in framing may be visible in the finished application. To minimize the
effect of uneven walls, shim the wall as necessary.
If you are hand nailing, it may be necessary to predrill to help prevent the corners
from breaking.
Ventilation
Proper attic ventilation is important for any home. The 2009 International Building Code
(IBC) Section 1203 Ventilation furnishes a basic guide for determining proper ventilation
for any home. The information provided here may under certain circumstances not
result in enough ventilation. Therefore, the calculation provided should be used only
as a guide.
The IBC guideline requires that any attic or space between the top floor, ceiling, and
roof must be ventilated. It requires one square foot of ventilation area for every 300
square feet of attic space, provided at least 50% of the required ventilating area has
already been provided by gable and vents or ridge vents.