Traditional Rafter And Purlin Roof Construction

The term plate means a major horizontal supporting timber.

Traditional rafter and purlin roof construction.

By supporting the rafters they allow longer spans than the rafters alone. This is the right way to fix truss clips connecting the rafter and wall plate. Exposed rafters are a feature of some traditional roof styles. Purlin plates in wooden construction.

11 some examples of older traditional roofs. A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin. Building control guidance note purlin and rafter roofs timber sizes and construction details. 9 complex purlin roofs.

8 simple purlin roofs. Pitched roof construction. Purlin plates are beams which support the mid span of rafters and are supported by posts. A common arrangement is a rafter and purlin system which combines purlins and rafters.

Parts of a traditional queen post roof truss. There are three types of purlins in wood construction. Sizes used in traditional roofing construction. The longitudinal horizontal beam that is sitting on a post or the principal rafter of a truss and used to support common rafters.

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. The rafters are the main load bearing elements of the roof. 10 complex new roofs. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction.

The overall construction of a traditional cut roof is to ensure that the load of the roof is evenly transmitted to the walls below. They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles. There are two basic methods of pitched roof construction. All the figures are based on roofing tiles or slates laid on.

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. Purlin plates under purlin principal purlins and common purlins. 7 simple traditional roofs.