Fiber-cement shingles and clapboards, made from a mix of portland cement, sand, and wood, usually carry a Class A fire rating, which means they can withstand 2 to 4 hours of high heat before your home's structure starts to fail. Note that most fiber-cement sidings require a gypsum-board underlayment to reach their maximum efficacy. Also, keep in mind that cladding your home in fire-resistant siding won't matter if embers find their way in through cracks or other flammable surfaces, so be sure to enclose eaves, soffits, and fascias with complementary fire-retardant trim. Some fiber-cement products, like Certainteed's
Weatherboards, are now molded to look like real wood. About $7 to $8.50 per square foot.