Installation Instructions
Allura Fiber Cement Siding Installaon Manual
39
Secon 9: Trim
For best results with Allura Fiber Cement Siding, we recommend you install Fiber
Cement Trim.
Other trims may also be used in conjunction with Allura Fiber Cement Siding. Refer to
the trim manufacturer for compatibility and installation instructions.
NOTE: Allura recommends 4/4” (5/4” nominal) trim for all lap and Shapes Allura Fiber
Cement Siding, and 3/4” (4/4” nominal) trim for vertical siding and veneers.
Before You Begin
Before you install the trim, review and comply with all local building codes and
regulations regarding wall construction, including the proper use of framing, weather-
resistant barriers, flashing, and other building materials and systems. Also, review
the general cutting, fastening, and wall preparation instructions in this guide. Some
important reminders:
Store trim up off the ground on a clean, flat surface in a garage or other
protected area.
Use corner protectors when banding fiber cement trim.
Do not install wet trim.
Lift and carry trim on the edges.
Keep the fiber cement trim at least 6” above the finished grade and 1” above
surfaces where water may collect (roofs, steps, decks, walks, and hard-surface
driveways).
Cutting
Use a circular saw equipped with a carbide tipped blade. DO NOT use a
polycrystalline diamond tip blade.
Cut fiber cement in a well ventilated area, and use cutting tools equipped with a
dust collector.
Wear safety glasses and appropriate dust protection equipment.
NOTE: Seal all field-cut edges with 100% acrylic latex paint.
Caulk
Caulk must comply with ASTM C920 (grade NS, class 25).
Use a high performance, paintable low-modulus elastomeric sealant applied in
accordance with the caulk manufacturer’s instructions.
Fastening
Nails: Corrosion resistant or stainless steel, 16 ga. finish nails. Nail length must
allow penetration of at least 1” into solid wood.
Screws: Corrosion resistant or stainless steel.