Shear Capacities for Wood-Framed Diaphragms

Last updated October 30, 2024
By Aidan Phelan

Based on SDPWS 2015 (Table 4.2). All specifications based on min. 19/32 floor sheathing, 12″ field nailing. All SDPWS shear values multiplied by 0.5 * (1 – (0.5 – 0.42)) to convert to ASD and adjust for SPF framing. Unblocked shear values show All other Cases / Case 1, in order to achieve higher sheathing each loading direction must be analyzed separately.

Nails	Blocking	Joist	Nail Spacing	Vs (plf)	Ga (k/in) (ply)
0.148×3	Unblocked	2x	6” all supported edges	197/262	8.5
0.148×3	Unblocked	3x	6” all supported edges	220/294	7.5
0.148×3	Blocked	2x	6” all edges	294	14
0.148×3	Blocked	3x	6” all edges	331	12
0.148×3	Blocked	2x	4” diaphragm boundary and continuous panel edges, 6” other panel edges	391	9.5
0.148×3	Blocked	3x	4” diaphragm boundary and continuous panel edges, 6” other panel edges	441	8
0.148×3	Blocked	2x	2 1/2” diaphragm boundary and continuous panel edges, 4” other panel edges	588	12
0.148×3	Blocked	3x	2 1/2” diaphragm boundary and continuous panel edges, 4” other panel edges	662	11