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A pitched roof is a roof which slopes downwards. In most cases this slope is in two parts and an angle from a central ridge. Sometimes a pitched roof is in just one part going from one edge to another. The pitch of a roof is calculated by dividing the vertical rise of the roof by the horizontal span of the roof. This also gives the steepness of the roof.
A pitched roof is any roof with a slope of 10 degrees or more. Whereas a flat roof is any roof with a slope less than 10 degrees (Flat Roofs are not perfectly flat as they need a gradient so water can drain away). In practice, flat roofs are much shallower than 10 degrees. The typical gradient of a flat roof is anywhere between 1:40 and 1:80.
A pitched roof construction is made up of a system of rafters, joists and purlins. The bottom of the rafters’ rest against the wall plates and the tops of the rafters are connected to the common ridge piece.
For a pitched roof with slate tiles the gradient of the roof is at least 20 degrees and for a pitched roof with standard tiles the gradient is between 40 and 60 degrees.
It is important that the slope of a pitched roof is not so steep it is dangerous for roofing contractors to work on when roof maintenance and repairs are needed.
If you need any advice on a pitched roof whether it is a new roof construction, repairs or maintenance and are in the Woking or Guildford area, Raynes Roofing would be delighted to help you. With over 45 years’ experience we will be able to advise you on the best material for your replacement flat roof just get in touch today or call us on 01483 475141.