Traditional Timber Cut Roof Design

Dormer windows require their own mini roofs and great care must be given to their detailing and construction.

Traditional timber cut roof design. They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles. Also different architectural styles will use the same type of roof. Types of pitched roof. Traditional timber framed buildings in suffolk invariably have pitched roof structures originally covered either with thatch clay tiles or later with slates imported from other parts of the country.

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. Intricate roofs have many parts that incorporate several of the basic roof designs such as a gable roof sitting atop a gambrel or variations of the gable valley roof design using one or a variety of different types of roof trusses also see our very detailed diagrams showing the different parts of a roof truss. A traditional method of cutting timber on site and building up the roof using rafters joists purlins ridge boards etc. The timbers are often 400mm or so centres and vary in size according to span.

There are two basic methods of pitched roof construction. The space between each truss is known as a bay. Trusses usually occur at regular intervals linked by longitudinal timbers such as purlins. The roof can be cut in the traditional way or fabricated from mono trusses.

The rafters are the main load bearing elements of the roof. This reflects the weatherproofing requirements of older roofing materials like thatch and peg tiles. 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. The quality of the design of dormers varies considerably from single skin walls clad with upvc sheeting to double skin designs with superior insulation properties.

Prefabricated trusses which are delivered to site and erected. 50mm wide by 75mm 100mm or 125mm deep are all. The overall construction of a traditional cut roof is to ensure that the load of the roof is evenly transmitted to the walls below. There are also a number of other framed constructions such as portal frame roofs.

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.