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