Calabash Roofing: Article About Roof Ratings
Choosing a new roof can be tough, especially considering all of the style, material, and cost options available. While some decisions are purely driven by personal aesthetics, others can significantly affect the roof's durability and safety. Luckily, most roofs are labeled with a variety of helpful ratings that aid homeowners in picking the right roofs.
Potential hurricanes, tornadoes, and other harrowing storms are a real concern for area homeowners. To withstand the hefty wind gusts, prolonged battering, and damaging uplift that come with these storms, local roofs need extra strong wind resistance. Roofs are tested to hold fast during these events, and their wind worthiness is expressed in class rankings. A trusted Calabash roofing contractor can help homeowners select roofs with the appropriate wind resistance, but homeowners should also understand the ratings.
Asphalt shingle roofs that can stay secure in the highest sustained 110 mph winds are rated Class F roofs by ASTM D3161 testing standards. Class D roofs are slightly less hardy, resisting winds at 90 mph. Class A roofs are at the lowest level of 60 mph wind resistance.
Shingles are tested separately for their ability to maintain their integrity in wind uplift and to prevent blow offs. Class H roofs provide the greatest wind uplift protection at 150 mph.
Have a question regarding commercial roofing or storm damage? Please ask a roofing contractor from The Roof Maker of Calabash NC.
Class G roofs are secure in winds up to 120 mph, and Class D roofs can take 90 mph wind gusts.
Wind isn't the only threat to local roofs, however. Hailstorms aren't frequent in the area, but when they occur, they can cause significant damage. United Laboratories and FM Global each provide methods for testing a roof's hail and impact resistance. While testing methods differ, their ratings are the same. A Class 4 impact resistant roof supplies the best hail safety, holding strong when hammered with hailstones that are 2 inches in diameter. Class 3 roofs can withstand 1.75-inch hail pellets, and Class 2 roofs remain intact with hailstones in the 1.5-inch range. Class 1 roofs are secure even when pelted with 1-inch hailstones.
Nearly 85 percent of all fire deaths occur in home fires, so it's also important that residential roofs offer as much fire protection as possible. A roof's fire resistance is tested and rated according to its material. Clay tile and metal roofs are naturally fire-resistant, but today's asphalt shingle roofs also provide excellent fire protection. Roofs with Class A fire resistance ratings provide the greatest safety while Class D roofs offer the least resistance.