Shear Capacity

The table below indicates where to find the shear strength values for the following materials

Structural sheathing
plywood siding

and provides the actual shear strength values for the following materials

fiberboard
lumber sheathing
wire lath and plaster
gypsum plaster
gypsum sheathing
gypsum wallboard

Refer also to the Design Factors that are applied to these capacities. Note that the values shown are those listed in the NDS divided by the 2.0 ASD reduction factor.

Shear Capacity
	Shearwalls	SDPWS
Wood Structural Panels	See Table 4.3A	Table 4.3A*
* Based on panel edge nail spacing, sheathing thickness, and fastener length


Structural Fiberboard		Table 4.3A
Structural ½	170, 230,260*	170, 230,260*
Structural 25/32	170, 230,260*	170, 230,260*
* depending on 4, 3, 2 nail spacing

Lumber Sheathing	-	Table 4.3C
Diagonal	300	300
Single	50	50
Double Diagonal	600	600
Vertical	45	45

Wire lath and plaster		Table 4.3C
All	180	180

Gypsum lath		T 4.3C
Vertical Joints not staggered	100	100
Vertical Joints Staggered	not included *	180
*Important Note - Shearwalls does not implement Gypsum lath with vertical joints staggered

Gypsum Sheathing		Table 4.3C
½” x 2’	75	75
½” x 4’ Block	175	175
½” x 4’ Unblocked	100	100
5/8” x 4’	200	200

Gypsum Wallboard
½”, 4” nail* sp, unb 24”	110	110**
½”, 7” nail* sp, unb 24”	75	75**
½”, 4” nail* sp, unb 16”	125	125**
½”, 7” nail* sp, unb 16”	100	100**
½”, 4” nail* sp, blk 16”	150	150**
½”, 7” nail* sp, blk 16”	125	125**
5/8”, 4” nail* sp, unb 24”	145	145**
5/8”, 7” nail* sp, unb 24”	115	115**
5/8”, 4” nail* sp, blk 16”	175	175**
5/8”, 7” nail* sp, blk 16”	145	145**
5/8” 2 ply nail	250	250
½”, 8/12” screw sp, unb	Not included	60
½”, 4/12” screw sp, blk	155	155
½”, 6/12” screw sp, blk	90	90
½”, 8/12” screw sp, blk	70	70
½”, 4/16” screw sp, blk	160	160
5/8”, screw 8”/12” unblock	70	70
5/8”, screw, 8”/12” blocked	90	90
** These values also apply to screws