Open joist

Details Open joist Open joist

E - Fixed Constructions

04

C

20/48

E04C 3/30 (2006.01)

Patent

CA 2008043

Disclosed is a wooden joist having upper and lower essentially parallel longitudinal chords and a plurality of interconnecting struts in zig-zag arrangement, each strut being terminally joined to a respective chord and to an adjacent strut near this chord by finger scarfing. In accordance with the invention, it has been found that the strength of the joints of this joist can be increased by ensuring that (a) the teeth of triangular section obtained by finger scarfing have an apical angle in the range from 8° to 10° (b) this triangular section has a perpendicular height in the range from 7/16 to 9/16 inch; and (c) the end of each tooth is truncated to form an apical butt and this apical butt in the line of the section is in the range from 0.025 to 0.050 inch.

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