It’s also more vulnerable to punctures than other choices.Even the black version, though, costs more than BUR or modified bitumen. The standard black material absorbs heat, and light-colored coatings (recommended in warm climates) add 30% or more to the cost.The material’s relatively light yet highly resistant to scuffs and tears.EPDM can be mechanically anchored with fasteners, ballasted with stone, or glued. The durable single-ply membrane material resembles an inner tube, but it’s engineered to resist damage from sunlight. So, a flat roof is an ideal choice for you if you love to have more natural light in your home. Unlike pitched roofs, flat roofs don’t have angled overhangs that often obstruct light rays from entering your home. It’s not as scuff- or tear-resistant as rubber-membrane roofs (see the next item).ĮPDM (short for ethylene propylene diene monomer) is a true rubber. The absence of angled overhangs in flat roofs enables better access to more natural light in your home.Torch-down application is a fire hazard, and not recommended for occupied buildings.Its price is in the middle of the pack.Its light-colored mineral surface reflects heat and cuts energy bills.Peel-and-stick material can be installed by homeowners.Newer peel-and-stick systems are safer and easier. Torch-down systems involve heating the adhesive as the material is unrolled. It’s not a DIY installation job, and it is hard to find the source of leaks.Ī single-ply rolled roof similar to ice-and-water shield, but impregnated with a mineral-based wear surface.Installation is not recommended for occupied homes. ![]() Joists sometimes have to be strengthened.It’s the cheapest of the four roof varieties.Attractive for windows and decks that overlook the roof.Once made of tar paper, these types of roofs gradually are using more-advanced materials such as fiberglass membranes. The traditional hot-tar-and-gravel roof is built from three or more plies of waterproof material alternated with hot tar and ballasted by a layer of smooth river stone. Flat roofs usually come with a 10- to 20-year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules. Pros and Cons for Flat Roof MaterialsĪll three types of flat roofing cost $250 to $350 per “square” (100 square feet), but prices vary according to region and size of the roof. What are the different types of flat roofs? Built-up roof (BUR), modified bitumen roof (MBR), and rubber membrane roof (EPDM). However, in countries where flat roofs are not illegal by the government or any local powers that be, most residents will still prefer them to the sloped roofs.Homeowners can choose among three kinds of flat roofs, says Bruce O’Neal, vice president of Matthews Roofing, which has been keeping Chicago’s many flat roofs dry since 1934. As a result, the size of the structural members for flat slabs are bigger than those of sloped roofs. The dead load for a flat slab is also relatively higher than that of a sloped roof. This means that more workforce is needed, more money has to be spent and a lot of materials are used up in the process. Lastly, flat slabs require more construction time. The repeated expansions and contractions result to cracked joints, flashing become detached and the seams begin to tear loose. Temperature fluctuations can cause these roofs to form cracks. One cannot repair a roof and they cannot see any cracks, leakage or fault. This means that repairing the roof is also difficult. It is very difficult to find out any leakage on the roof. Sometimes, one may need help to clean the roof and that brings in unnecessary expenses. A homeowner whose roof is flat, will clean his roof a lot more often. The flat roof collect a lot of debris and dirt than the sloped roof. ![]() They also lack history that would help one predict how long they will last. The materials that can be installed in combination with them e.g. ![]() ![]() Despite the fact that materials like rolled roofing, rubber and Bitumen are available and inexpensive, they have a limited lifespan of ten to fifteen years. Thirdly, there is lack of roofing materials. The initial cost for installing a flat roof is also relatively higher than the sloped roof. This means more building materials and an increase in the expenses. The weight of the roof has to be compensated for on the interior. This makes them less stable compared to the sloped roofs. Flat roofs cannot endure the weight of snow buildup and heavy rains and eventually breakdown or leak along the seams.įlat roofs cover a large area. Standing water can collapse a flat roof posing dangerous risks to the occupants of the house. These roofs do not let water or rain build up on them. While building residential houses, most roofing companies encourage owners to use sloped roofs. A roof is the uppermost part of a building that provides protection from animals and weather conditions like rain, snow, sunlight, heat etc.
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