Roofs that are energy efficient are available in a variety of materials to fit any home. Your final choice of the right new roof for your home will depend, to a large degree, on where you live, the architectural style of your home, and local preferences, just as it does with conventional roofing materials. Most discussions of residential roofing choices, on the other hand, seem to concentrate on the materials that are most widely used on pitched roofs. If you have a flat roof, the requirements would be slightly different. There are a range of energy-efficient flat roof options to consider. look at this site it offers excellent info on this.
In the San Francisco Bay Area and the desert Southwest, flat roofs are very common. Flat roofs or portions of roofs are used in many architectural styles in the Deep South. Low-pitched roofs may also make excellent use of the same energy-saving materials.
Flat roofs face many challenges: • They are far more complex to build • They are extremely difficult to maintain • There are few long-term solutions available • They have persistent drainage issues
• Insufficient insulation
There are energy-efficient roofing materials available for flat and low-pitched roofs that have many of the same advantages as other steeply pitched roof materials. Some of these materials are widely used in commercial buildings and have proven to be very reliable. You, like many other homeowners across the United States, may be considering repairing your roof while taking advantage of federal tax credits and other available incentives.
New energy-efficient roofing systems offer lower cooling costs, a longer roof life with less maintenance, improved wind resistance (up to 110 mph), better seals and less leakage from wind-driven water, and better insulation to prevent heat transfer.
Foam sprays and membranes are the most energy-efficient roofing systems for flat and low-pitched roofs. For a flat roof, there are three main styles of materials to choose from.
Seamless Spray Roofing Membrane or Sprayed Polyurethane Foam are two types of spray roofing (SPF).
A chemical reaction occurs when two liquids are combined at the spray nozzle, causing the foam to expand twenty or thirty times, creating a strong, unbroken roof system that adheres over the entire roof. The water resistance and thermal insulating properties of these spray roofing materials are exceptional. They can save up to 500 times more energy than conventional tar and gravel methods. It is not appropriate to remove the old roofing materials because the sprays stick to almost everything. A protective “elastomeric” coating is then applied to the foam. To put it another way, the coating covers the foam and spreads with it in hot and cold temperatures. It has been shown to save up to 58 percent on energy costs and can pay for itself in as little as four and a half years in some areas. Spray roofing will last 50 years or shift if properly washed, primed, and recoated every ten to fifteen years.
Polyolefin or Thermoplastic Olefin (TPO).
A single-ply roof membrane is created with this material. It’s made of ethylene propylene rubber, which means it’ll last a long time while still being flexible enough to react to building movement. It’s immune to ozone and algae, as well as punctures and tears from impacts. Seams are welded in such a way that manufacturers can argue they are nearly one piece. Ballast is used to hold the membrane in place around the periphery and at all penetrations.
Monomer of ethylene propylene diene (EPDM).
Since the 1960s, this single-ply membrane has been used in the United States. It is a common flat roof roofing material because it is less costly than other alternatives and relatively simple to instal. EPDM is a rubber-based material that is pliable enough to withstand building movement. Depending on the weather, it can be mounted in three different ways (particularly wind). It can be entirely adhered around the entire roof, mechanically fastened to the substrate, or loosely laid and held in place with a ballast (often river rock). Special splicing tapes are used to seal the seams.