In the U.S., all roofing systems are required to meet insurance and building code standards. This includes resistance to fire under roof fire ratings. As it is necessary to be familiar with regulations, here’s a guide you can review to understand these ratings and to keep your property safe.
Roofs are rated as manufacturers submit samples of their roofing products to a certified testing laboratory for certification. These undergo test conditions that determine a roof’s fire resistance. The fire rates are the following:
Class A roofing is the preferred choice for any home. However, this type of roofing is especially vital if you live in an area that is prone to wildfires. To achieve a Class A rating, the roof must be effective against severe fire exposure. This is proven if it can experience the maximum flame spread of 6 feet and resist 15 cycles of a gas flame turned on and off. It should be able to withstand a burning brand measuring 12 by 12 inches and weighing 2000 grams and last one hour before ignition.
Class B roofing is effective against moderate fire exposures. The maximum flame spread should be 8 feet. It should be able to withstand a burning brand measuring 6 by 6 inches and weighing 1.1 pounds, last one hour before ignition, and can resist eight cycles of a gas flame being turned on and off.
Class C roofing provides light fire protection. This normally applies to untreated wood shakes and shingles, plywood, or OSB. The maximum flame spread should be 13 feet. It should be able to withstand a burning brand measuring 1.5 by 1.5 inches and weighs 0.009 ounces, last 20 minutes before ignition, and can resist 3 gas flame cycles.
Unrated Roofing means it could not pass even the requirements for Class C roofing materials. This type of roofing provides little, if any, fire resistance and should be avoided. Understand that most building codes will not accommodate any type of unrated roofing material. Contact a professional to have yours checked or for a roof repair.
Take note of these ratings to help you determine how secure you and your family are at home. Depending on the requirements of your area’s building code, these can also distinguish whether a particular roofing material is even a viable option. Hence, getting the right roofing is essential.
If you’re looking for fast and accurate services, Universal Roofing & Exteriors offers drone roof inspections. Contact us for all your roofing needs at (317) 376-1212 or request a quote. We serve clients in Indianapolis, including Fishers and Zionsville, IN.