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.

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.

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.

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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Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900