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Roof trusses

Girder truss

A girder truss is a strengthened, often multi-ply truss that carries the load of other trusses or of a point load.

Also known as girder truss, truss girder, multi-ply truss, carrying truss, double truss

Where trusses cannot bear on a wall, for example around a large opening, at a hip or where two roofs meet, they are hung from a girder truss instead. The girder is usually two or three trusses fixed together side by side, with heavier members and plates.

The supported trusses are connected with truss hangers, and the girder passes the combined load to its own supports.

Related terms
Hip trussHip trusses are a set of trusses of decreasing height that together form the sloping end of a hipped roof. Span (truss span)The span of a truss is the distance it covers between its supports, normally measured from the outside of one bearing wall to the outside of the other. Truss typesRoof trusses come in many shapes, such as fink, mono, attic, scissor and girder trusses, each suited to a different roof form, span or use of the roof space.
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