TABLE OF CONTENTS The roof of a brick-built house is normally an aitched (sloping) roof comprising rafters fixed to a ridge board, braced by purlins, struts and ties and fixed to wall plates bedded on top of the walls. They are then usually clad with slates or tiles to keep the rain out.
Timber-framed houses usually have trussed roofs prefabricated triangulated frames that combine the rafters and ceiling joists which are lifted into place and supported by the ails. The trusses are joined together with horizontal and diagonal ties. A ridge board is not fitted, nor are purlins required. Roofing felt battens and tiling are applied in the usual way.
The building shall be constructed so that the combined dead, imposed and wind loads are sustained and transmitted by it to the ground.
(Approved Document A1)
As a fire precaution, all materials used for internal linings of a building should have a low rate of surface flame spread and (in some cases) a low rate of heat release.
(Approved Document B2)
The roof of the building shall be resistant to the penetration of moisture from rain or snow to the inside of the building.
All floors next to the ground, walls and roof shall not be damaged by moisture from the ground, rain or snow and shall not carry that moisture to any part of the building which it would damage.
(Approved Document C2)
Rainwater from roofs shall be carried away from the surface either by...
