A key factor of insulation system performance is the installation.
Cedar-shake shingles prohibited in Hailey, Idaho, to stop spread of wildfires
Ban based on concern about fire retardant wearing off of shingles
Hailey, Idaho, has banned cedar-shake shingles in conjunction with the 2012 International Fire Code, which includes the Wildland Urban Interface Code. The code allows the shingles if they are treated with fire retardant, but the city banned them completely after a wildfire last year. The retardant can wear off the shingles and embers can set them on fire, said the city's fire marshal.
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