Squash Blocks & Blocking Panels
Blocking & Backer Blocks
Four-by-two wood floor trusses are made up of small members (usually 2x4s) that are connected so that they act like a single large member. The parallel top and bottom chords and the webs are made of lumber held together at the intersections with toothed metal plates.
The open web allows for utilities to run through the floor without altering the truss. Round ducts from 5 in. to 16 in. in diameter can be accommodated, depending
on the depth of the truss. Truss depths vaiy from 10 in. to 24 in., with spans up to about 30 ft. Like I-joists, floor trusses are practical for long spans and simple plans, but difficult for complicated buildings.
Floor trusses are custom manufactured for each job, and cannot be altered at the site. Bearing walls, floor openings, and other departures from the simple span should always be engineered by the manufacturer.
