Graphical Construction Glossary >> Roofs and roofing. >> Roof Trusses >> girder truss

Girder truss
A nailplate roof truss that acts a truss, but at the same time is built stronger than a standard truss of the same span to carry extra loads imposed on it.
Used in nailplate truss construction. Sometimes consists of two or more standard trusses fixed together.

girder truss

Above is a sketch of how nailplate trusses handle the creation of a "T: shaped roof.

The key to the process is the Girder which spans the gap where there are no walls. The truss itself in hard to pick from a standard one that spans the same distance. IT has the same shape, but is built out of stronger members.

a nailplate roof

Above is a shot looking at the real thing. This is just a single truss, but you can see a deeper section to the bottom chord at least.

a scotch valley

Above is a sketch of a traditional scotch valley which also spans across a 'Tee' or 'L' junction. The girder truss takes the place of the support beam

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