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

reducing truss
One of a set of nailplate roof trusses that sit on the backs of other trusses to form valleys.

Also known as valley trusses and valley sets.

girder truss

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

The process is similar to building a scotch valley in standard framing. Also look at the explanation for a girder truss.

reducing trusses

Looking up through the inside of a roof in construction. The trusses can be seen sat on and clipped to the top chords of the trusses under them.

A point to note is the fact that these particular trusses are very simple with just vertical webs. There is not the same need for the angled webs as the trusses are well supported along their bottom chords.

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