IRC Section R314.5.11 is amended to read as follows:
R314.5.11 Sill plate and headers. Foam plastic shall be permitted to be spray-applied to a sill plate and header (rim joist) without thermal barrier subject to all of the following:
1. The maximum thickness of the foam plastic shall not exceed 5-1/2 inches (139.5 mm).
2. The foam plastic shall have a flame spread index of 25 or less and an accompanying smoke developed index of 450 or less when tested in accordance with ASTM E 84.
February 23, 2009
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