Traditional Rafter And Purlin Roof Construction

A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin.

Traditional rafter and purlin roof construction.

11 some examples of older traditional roofs. Purlin plates under purlin principal purlins and common purlins. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles.

The term plate means a major horizontal supporting timber. A common arrangement is a rafter and purlin system which combines purlins and rafters. 9 complex purlin roofs. The rafters are the main load bearing elements of the roof.

The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters. These are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. This is the right way to fix truss clips connecting the rafter and wall plate. There are three types of purlins in wood construction.

Parts of a traditional queen post roof truss. 8 simple purlin roofs. Pitched roof construction. All the figures are based on roofing tiles or slates laid on.

7 simple traditional roofs. 10 complex new roofs. The overall construction of a traditional cut roof is to ensure that the load of the roof is evenly transmitted to the walls below. Purlin plates in wooden construction.

The roof support system is a ridgepole and either rafters which run perpendicular from the top of the walls to the ridge or purlins which run parallel to the ridge. There are two basic methods of pitched roof construction. Purlin plates are beams which support the mid span of rafters and are supported by posts. Traditional or cut roofs usually comprise a series of sloping timbers rafters fixed to a wall plate at their feet and a ridge board or possibly a wall plate at their head.

By supporting the rafters they allow longer spans than the rafters alone. A cut roof this is the traditional method of cutting the timber on site and building up the roof using rafters ridge boards joists and purlins etc the exact details being determined by the size of roof size of timbers etc. Building control guidance note purlin and rafter roofs timber sizes and construction details.