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Roof joist construction.
Construction worker on roof.
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An additional roof joist is added at each end to hold the other two sides in place.
Joists fit into gaps in the uppermost top plates of the two sides.
Roof supports which are angled are known as rafters.
Joist is a term used in construction for load bearing planks that run horizontally or nearly to horizontally to ground.
Joists attach to beams lying parallel to each other and being aligned horizontally.
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So the only reason these planks are called roofing joists is because they run horizontally or nearly horizontally to the ground.
For example the i joist is normally most common for floor construction where the joist needs to span great distances over basements or enclosed crawl spaces without using a post and the truss joist typically works best for roof construction where framing members need to span large rooms without placing a wall underneath for support.
Plywood panels on top.