Affordable Metal Roofing in San Antonio FAQ
Affordable Metal Roofing in San Antonio Surfaces Reflect Heat
Metal reflects radiant heat from the sun, minimizing midday heat gain. This reflective characteristic means you save energy needed for air conditioning during the day. In fact, federal rebates are offered for metal roofing that has appropriate pigmented coatings that meet EnergyStar requirements. You can get a 10% tax credit up to $500 (not including labor).
Regarding the insulation value of metal roofing in both heat and cold: Though the material itself is low in insulation R-value, metal roofing can be applied over foam insulation that has very high R-values. In addition, many systems utilize a dead-air space between the metal surface and roof deck beneath it to minimize heat transfer, increasing energy efficiency.
Affordable Metal Roofing in San Antonio Doesn’t Catch Fire
Because metal roof materials are noncombustible, they typically have a Class A fire rating (the most fire-resistant rating). Flying sparks and embers will not set them on fire.
Just be aware that part of a roof’s overall classification depends on materials beneath the surface that could ignite in intense heat, too. Most metal roofs applied over a combustible material such as wood shingles have a lower, Class C rating for this reason. (See notes under “Metal Roofing Drawbacks” regarding problems in the event of a house fire.)
Most major metal roof manufacturers back their products for 20 to 50 years. Products with painted finishes typically have a 30-year limited warranty. Materials finished with extremely durable resin-based polyvinylidene fluoride (PVDF) coatings have 50-year warranties. (Kynar® is the trade name of one very popular PVDF coating.)
Affordable san Antonio Metal Roofing Is Lightweight
Metal roofing weighs from 1 to 3 pounds per square foot, depending upon the thickness and profile of the material. It is one of the lightest of all roofing materials. By comparison, here are typical weights of other roofing materials:
Conventional asphalt shingles — from 2 to 3.5 pounds per square foot
Textured (architectural) asphalt shingles— from 3.5 to 5 pounds per square foot
Wood shingles and shakes—from 3.5 to 4.5 pounds per square foot
Clay or concrete tile—5.5 to 10 pounds per square foot
Because metal roofing is lightweight, you can save on the engineering and building of the supporting structure. In fact, if you’re building a new house or a new addition, you can often downsize or reduce the number of roof support members because of metal roofing’s light weight.
Can Metal Roofing Go Over Existing Shingles?
As long as the existing roof surface and the decking beneath it are sound, flat, and free of rot, metal roofing can usually be applied over the top of one old layer of asphalt shingles. Check local codes and the manufacturer’s specifications before doing this.
Of course, tearing off the old roof so you can start with flat, sound sheathing certainly gives you a much cleaner starting point. But leaving the old roof in place also has advantages. For example, it:
Decreases labor and haul-off expense of stripping the old roof
Leaves an extra insulation barrier for increased energy efficiency
Minimizes the debris and disruption to your home and yard during the project
Adds additional sound insulation for rain and hail
A Metal Roof Installs Fast
Metal roofing materials are sold as large “standing-seam” sheets or in multiple-shingle sections that are 12 to 36 inches wide. Standing seam sheets are typically 3 feet wide by 6, 8, 10, 12, 14, and 16 feet long. You can also get custom sizes.