Self Build: Everything you need to know about roofs
30th April 2007
Fitting a roof
The roof covering composition has several roles:
- To provide a rainproof cover and guide water away sensibly
- To stop wind penetration
- To insulate the building
- 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:
- Roof tile.
- Underfelt.
- Ventilation path from eave to ridge.
- 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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