Flat, continuous sheets are the standard installation method for these roof coverings. Pavement and wood are the two most used materials for flat roofs. There is a common use for bituminous felt, asphalt, and other materials that are applied on-site.
A concrete slab flat roof typically has a structural layer of smooth, screed-polished concrete and a waterproof membrane or other covering on top. Common roofing practices include insulation and a vapor control layer to avoid material condensation.
On the other hand, timber flat roofs use plywood or any comparable sheet material to cover structural joists.
Roof covering and the needed rate of rainwater discharge dictate the pitch. There are several possible methods of creating a fall (slope), the loadings and span of the flat roof will determine the spacing and sizes of the joists required.
A membrane or sheet material like lead will cover a timber construction to make it watertight, just like a concrete flat roof. Insulation and vapor control will avoid interstitial condensation on the roof.
To comply with Building Regulations, most roofs above the habitable part of the house will need to be insulated. One aspect to consider about flat roofs is that they are prone to weakness where they are bent; for example at parapets and verges, where they are penetrated by ducts, flues, and so on, and at joints or seams.
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