Installation Instructions
Allura Fiber Cement Siding Installaon Manual
29
Fastening Requirements for Atypical Walls
Non-vertical Walls
Fiber Cement can be installed on non-vertical walls when the walls are no more than
30° off the vertical, or no less than a 60° angle, measured from the plane of the ground,
and the wall is not a functional roof above occupied space. The top of the wall cannot
be higher than 30’ above grade. Because of different wind-load requirements, your local
building code may stipulate a lower height. Use the lesser of the two heights.
1. Install an underlayment of #15 (minimum) felt or waterproofing membrane.
2. Cap the uppermost edge of the top siding course to prevent the water from
getting behind the siding.
3. Flash all accessories to shed water away from the substrate.
Alternative Wall Systems
Allura Fiber Cement Siding may be applied over alternative wall systems such as
Structural Insulated Panels (SIP), Insulated Concrete Forms (ICF), and Rainscreen
Systems. Fastening requirements for the siding depend on the specific wall system
design. Fastening fiber cement onto alternative wall systems must be in accordance
with local building codes. Refer to the specific wall system manufacturer for cladding
recommendations.
Structural Insulated Panels
Structural Insulated Panels (SIP) are a manufactured wall system, so follow the
manufacturer’s instructions for the application of the SIP and cladding.
The siding attachment methods and their allowable wind load capacities below are
based on testing in accordance with ASTM E330 (wind load) and ASTM D1037
(fastener withdrawal and pull through). The SIP system must be capable of supporting
the imposed loads from the siding, including dead load and wind loads.