Traditional Cut Roof

The rafters are the main load bearing elements of the roof.

Traditional cut roof.

The flexibility of roof trusses is undoubtedly what sets them apart from other methods of construction in this area. Prefabricated trussed rafters also have distinct advantages over traditional cut roofs by being able to clear greater spans without the need for additional supports. Our modern design software allows the roof trusses to be designed for virtually any roof shape. 50mm wide by 75mm 100mm or 125mm deep are all.

The roof can be cut in the traditional way or fabricated from mono trusses. As we have briefly mentioned above the birdsmouth joint is mainly used in forming traditional cut roofs to ensure that the rafters or joists that form the roof sit securely on top of the supporting wall plate. 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 finished structure is readily adaptable.

The timbers are often 400mm or so centres and vary in size according to span. They span from the wallplate to the ridge board providing a platform for the underlay battens and tiles. The overall construction of a traditional cut roof is to ensure that the load of the roof is evenly transmitted to the walls below. Birdsmouth joint as used in the construction of traditional roofs close up of a birdsmouth joint.

Dormer windows require their own mini roofs and great care must be given to their detailing and construction. A truss roof using factory made trusses which are delivered to site complete and just erected.