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Open Joist™ Standard Truss Configurations


Open Joist™ floor trusses are "stock" trusses built to standardized configurations determined by truss depth and length. Engineering fits these standard trusses into specific job situations by matching truss depth, on-center spacing and other factors to residential floor loadings and other requirements.

Standard configurations for Open Joist trusses.
9-1/4" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
9-1/4" 3' thru 16' 3 x 2 – #2 SPF
9-1/4" 17' thru 20' 4 x 2 – MSR 2100 SPF

11-7/8" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
11-7/8" 3' thru 17' 3 x 2 – #2 SPF
11-7/8" 18' thru 19' 4 x 2 – #2 SPF
11-7/8" 20' thru 23' 4 x 2 – MSR 2100 SPF

14" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
14" 3' thru 18' 3 x 2 – #2 SPF
14" 19' thru 21' 4 x 2 – #2 SPF
14" 22' thru 25' 4 x 2 – MSR 2100 SPF


16" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
16" 3' thru 17' 3 x 2 – #2 SPF
16" 18' thru 22' 4 x 2 – #2 SPF
16" 23' thru 26' 4 x 2 – MSR 2100 SPF
16" 27' thru 30' 4 x 2 – MSR 2400 SPF


18" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
18" 3' thru 22' 4 x 2 – #2 SPF
18" 23' thru 26' 4 x 2 – MSR 2100 SPF
18" 27' thru 31' 4 x 2 – MSR 2400 SPF


20" Standard Open Joist Configurations

Joist Depth

Joist Length Chord Size & Grade
20" 3' thru 22' 4 x 2 – #2 SPF
20" 23' thru 26' 4 x 2 – MSR 2100 SPF
20" 27' thru 32' 4 x 2 – MSR 2400 SPF