Flat Roof vs Pitched Roof: Which is Better?
In short any roof covering that can make a flat roof waterproof in one layer, unlike roofing felt with its 3 layer system for instance. This can include EPDM rubber and fibreglass talked about above, but commonly, especially in the trade, and in this article it refers to PVC, TPO, TPE and PIB.
What Pitch is a Flat Roof? If flat roofs are to work well, they have to have a slope, known as a fall, to shed rainwater. The fall should never be less than 1:80 and preferably about 1:40. There are several methods of building in a fall: One is to set the cross walls at different heights.
UV rays - The covering of a flat roof will spend many years exposed to ultra violet light from the sun, this can lead to oxidisation of the roof surface causing the plasticisers leak out and the surface to become brittle. This can significantly affect the performance and durability of the roof.
WARM AND COLD ROOFS Householder’s Guide to Flat Roofing In a flat roof, the waterproofing is always supported by a structural roof deck. This is usually a timber boarding of some type, which in turn is supported on joists. The ceiling, if any, is usually fixed directly to the underside of the joists.
Felt flat roof. Built up felt roofing consists of two to three layers of bitumen sheet that have been bonded together using either hot bitumen or adhesive. With an average life expectancy of 15 to 30 years, flat felt roofing is economical but has a tendency to crack as it ages and the temperature changes.
Going back about 120 years, the grandfather of flat roofs is the built-up roof or BUR. Built-up roofs have solved the low pitch roof problem for ages, a challenge that asphalt shingles could never handle. Built-up roofs are installed using several layers of a special type of roofing felt that has been asphalt impregnated and embedded in bitumen applied with a hot mop.
Flat roof coverings The two materials most widely used to cover flat roofs are traditional Bitumen-based roof felt and a tough Butyl rubber based material, which is more flexible than roof felt and will not degrade following long exposure to sunlight. Another advantage Butyl rubber has over felt is that it can be laid over an old felt roof.
One of the most common places to find asbestos is on flat roofs. If you think you have an asbestos roof, it will need to be removed or encapsulated by a professional before a new roof covering can be installed. Below is our guide to asbestos removal prices in the UK: Asbestos removal cost guide.
Looking for flat roof insurance? If your roof is less than 30% flat you might not have any trouble sourcing cover. If it is more than 30% flat you might find that it is difficult to find cover, however HomeProtect provide flat roof cover online - get a quote here.
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View our article on Flat Roof Product Comparison here. Cold-Applied roof coverings. Bitumen is a traditional roof covering material for flat roofs and has a long lifespan, when installed correctly. Modern roof coverings promise even longer lifespans as well as more efficient performance.
Flat Roof Systems Comparison Chart Duranite Polymeric vs GRP Fiberglass vs EPDM Rubber vs Felt As experts in both the Duranite Polymeric and GRP Fiberglass systems, Falcon Roofline continues to offer the superior solution for any application.
A flat roof also creates more space inside the structure compared to pitched roofing. This makes the most out of the dimensions of any sized building. Cost: Fewer materials are generally used in the construction of a flat roof making it a considerably cheaper option compared to a pitched alternative.
