Roof Rafter And Beams

Collar ties rafter ties tension beams structural ridge beams.

Roof rafter and beams.

This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. You will need a roof beam as a nailing surface to support the rafters. The table below shows built up beams for 31 3 psf of snow loading. Sample maximum roof beam span table feet inches.

Some of these can support the roof and prevent ridge sagging and wall spreading. Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide.

Once again you will need to look at your local charts and use your local snow load factor to determine the maximum span for a given wood rafter size. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. In home construction rafters are normally made of wood. A rafter is one of a series of sloped structural members such as wooden beams that extend from the ridge or hip to the wall plate downslope perimeter or eave and that are designed to support the roof deck and its associated loads.

A pair of rafters is called a couple.