While there are many variations of acceptable installation conditions and practices, FPIS is commonly applied to the exterior side of typical wood frame walls in accordance with the installation sequence shown in this animation, which also shows the use of wood structural panels underneath FPIS as one of many wall bracing options and the optional best-practice use of furring over the FPIS for cladding installation:
Step 1: Install FPIS to Wood-frame Wall
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Install wood structural panel bracing or other code-compliant bracing method in accordance with the building code and the bracing manufacturer’s instructions.
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Install and fasten FPIS panels to wood framing in accordance with the FPIS manufacturer's installation instructions.
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FPIS panels should be butted against each other to minimize gaps between panels.
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Typical FPIS fastener “interior spacing” is 16 inches on center and “edge spacing” is 12 inches on center.
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All FPIS panel edges must be supported on nail-base sheathing or directly on framing members.
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Typical fasteners include roofing nails, plastic cap nails, staples, and washered screws.
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Construction adhesives suitable for use with wood and foam plastic materials may be used in combination with sufficient fastening to bed the FPIS panel in adhesive and maintain a plane and straight surface. Refer to adhesive and FPIS manufacturer instructions for guidance on use of adhesives.
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Do not over- or under-drive fasteners.
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Fastener heads or washer should be flush with the surface of the FPIS panel which is bearing firmly against the wall substrate.
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