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Products must be certified and labeled to show they conform to their established ASTM standard:
CLADDING — IRC R703 provides prescriptive and performance installation requirements:
SOFFIT — IRC Section R704 provides specific requirements for the installation of vinyl soffit panels:
IRC R703.14.2 limits the use of polypropylene siding on walls that are closer than 5' to the property line (separation distance) and on walls 10' or closer to walls of other buildings on another lot unless a certification of flame spread index is provided in accordance with R703.14.3. Note, this provision does not apply to walls that are perpendicular to the line used to determine the separation distance (example: front and rear elevations of townhouse construction).