It may be necessary to inspect flats roofs more frequently, if the internal use is moisture critical e.g. This inspection should include the rainwater goods, valley gutters and rainwater outlets. Surveys should also be carried out after storms. ![]() Therefore, it is advisable that a flat roof be inspected twice a year, preferably in the spring and autumn, to arrange the clearance of leaves, debris and dirt that may prevent proper drainage or cause deterioration, and to identify at an early stage any signs of failure. However, all too often poor maintenance or lack of additional treatments such as gravel or solar reflective paint, as well as movement within the roof structure itself, can lead to premature failure. Felt roofs of this age can continue to perform well, especially if the owner continues to maintain and protect them. Many homes have substantial flat-roofed extensions, with this there is a common misconception that the felt coverings have a life span of 10 to 15 years. However, jump to the present day, and while flat roofs have grown in size, this has not always been matched by improvements in quality In Victorian houses, flat roofs played a fairly minor role. Typically, this is not a DIY job.īe sure to find an installer who stands behind their work and can help you make the best decisions for selecting and maintaining your roof.The pros and cons of what to consider if you are looking to buy, or already own, a home with a flat roof. However, since water drains more slowly from a flat roof, you want to make sure it’s installed correctly. It’s essential to hire experienced and reputable roofing professionals.Īll roofs can leak. So, research options to decide which approach works best for your application and budget. There are pros and cons to each flat roofing system, including differences in costs and maintenance. Unfortunately, it’s relatively easy to puncture a membrane roof, but repairs are pretty simple. This is typically the lightest weight option. Sheets of a flexible, waterproof membrane (often rubber) are rolled out. When the sheets are unrolled, a torch is used to heat the underside, which helps the material adhere to the base layer. Modified bitumen (MBR)Ī lighter-weight alternative to BUR, modified bitumen is an asphalt-based material with a mineral coating, similar to asphalt shingles. But it’s also the heaviest and may require extra structural support. This is the traditional method of finishing a flat roof. The most common systems are: Built-up roofing (BUR)Īlternating layers of roofing felt and hot asphalt (or tar) are built up, and the top asphalt layer is covered with gravel to reflect the sun and protect the lower layers. ![]() In contrast, low-slope roofs require a continuous waterproof surface so standing water can slowly drain or evaporate. ![]() Overlapping shingles work well on pitched roofs since gravity readily pulls water downward. Three types of flat roof systems are most common. Flat roof systems typically include a layer of insulation below the roofing material, but the lack of an attic limits your ability to add insulation later. Homes with flat roofs don’t have attics, so there’s less storage space. Of course, you’ll also need to factor in the weight of any rooftop features, like a deck-plus snow accumulation, if applicable, in the winter. ![]() There are drawbacks to flat roofs, too.įlat roofs often weigh more than pitched roofs and may require additional structural support, especially if the roofing material is heavy. You’ll also have more options for installing an array of solar panels. You might be able to use the roof for outdoor living space or additional storage. Walking on flat roofs is easier and safer than on pitched roofs, making installing, inspecting, and maintaining a flat roof simpler. However, there are significant differences in the cost of materials used to finish the roof. Since a flat roof is constructed without trusses, it may cost less to build one. Scuppers are another option-large square openings in the roofline with downspouts directly below the scuppers to carry the water away. Since a flat roof isn’t actually flat, some prefer calling them “low-slope” roofs.Ī house with a flat roof is often higher in the center and uses gutters and downspouts to collect roof water and divert it away from the home. With a flat roof, however, the pitch may be as little as 1/4- to 1/2 inch per linear foot. Flat roofs aren’t flat.Įvery roof must slope, to some degree, for water to drain. What should you know about flat roofs if you’re new to them? 1. Would you like to buy a home with a flat roof? Do you already own one? Even though flat roofs are more common in commercial buildings, they’re also popular for many single- and multiple-family residences.
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