Collar beam

by Anon


In roofing terms, what is a collar beam and where does it go?


(This person wished to remain anonymous)

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Apr 28, 2011
Definition of a collar in roofing terms
by: Gary

When a roof is constructed collar beams are the horizontal roof members that are installed to stop the roof from spreading.

Together with two common rafters they create a strong trianglular shape that also adds strength to the walls.

A seat cut is needed at each end and they are usually bolted to the rafters.

In a normal loft conversion for example, the collars are also the joists that the plasterboard is screwed to in order to form the ceiling.

More info and a picture on the gable roofing page here

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