Traditional Cut Timber Roof

This reflects the weatherproofing requirements of older roofing materials like thatch and peg tiles.

Traditional cut timber roof. The rafters distribute the load of the roof covering and structure to the external walls. 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. It has a timber purlin on each slope built into the gable ends.

Roof trusses use much lighter weight timber than traditional cut roofs and are held together by metal plates. Not only is the volume large enough to convert into living space but the structure can generally be easily. A timber roof truss is a structural framework of timbers designed to bridge the space above a room and to provide support for a roof trusses usually occur at regular intervals linked by longitudinal timbers such as purlins the space between each truss is known as a bay. On the downside timber is subject to rot or warp.

The overall construction of a traditional cut roof is to ensure that the load of the roof is evenly transmitted to the walls below. A truss uses 40 percent less timber than traditional pitched roof construction methods according to mitek truss fabricators. A traditional method of cutting timber on site and building up the roof using rafters joists purlins ridge boards etc. Pitched roof construction.

The finished structure is readily adaptable. Types of pitched roof. Traditional cut timber pitched roof structures were in common use up until the 1970s. Traditional or cut roof.

In the left hand image you can see the overall layout of the roof. There are also a number of other framed constructions such as portal frame roofs. The traditional option is steeply pitched rarely less than 35. This roof shown on a previous page is a good example of a traditional cut roof with dormers.

The timbers used to construct a truss are smaller in dimension and span greater distances. They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles. Timber roof trusses are used for 95 of new build roof structures. Timber roof trusses provide an environmentally friendly alternative.

In larger roofs lateral restraint typically in the form of collars spanning between the rafters prevents the structure from spreading outwards. Prefabricated trusses which are delivered to site and erected. There are two basic methods of pitched roof construction.