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Is there a top or bottom to a TJI® joist?

Structurally, no, TJI® joists are manufactured without camber and with uniform properties regardless of orientation. However, the location of the pre-punched knockout holes will tend to be nearer one flange, so a builder might choose to install them with the holes down, to ease wiring or plumbing installations. Installing TJI® joists in a roof, with the holes near the top, might allow a builder to gain some cross ventilation from joist bay to joist bay.

 

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