Widely used for a range of building types trussed rafters are an economical versatile and straightforward solution to providing a roof to a building.
Trada roof trusses.
The most common pattern is the fink or w truss designed for symmetrical double pitch roofs although there are a variety of shapes suitable for most roof designs.
Trussed rafters are individually designed prefabricated structural components made from strength graded timber members of the same thickness joined together with punched metal plate connectors.
Surveyors span tables for designing roof rafters.
They have been popular since the 1960s.
The trada truss was relatively short lived most modern roofs are constructed from trussed rafters.
The tda trusses were built on site using toothed plate connectors and were based on standard designs that were published by the timber development association tda the forerunner of the timber research and development association trada.
Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.
With roof trusses large spans and challenging roof contours are no barrier to creating innovative eye catching design solutions.