Self Build: Everything you need to know about roofs
Self Build: Everything you need to know about roofs
30th April 2007
Fitting a roof
The roof covering composition has several roles:
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To provide a rainproof cover and guide water away sensibly
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To stop wind penetration
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To insulate the building
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To stop condensation forming
The components of a roof structure are shown in the diagrams that follow:
Generally the layers of the roof (progressing from the outside) are:
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Roof tile.
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Underfelt.
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Ventilation path from eave to ridge.
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Insulation.
The insulation may be over, between or indeed under the main supports (rafters or trusses).
The ventilation path may be over the top of the underfelt if a breather felt is used (it should be these days).
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