Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 23 - Wood › Section 2306 - ALLOWABLE STRESS DESIGN › Subsection 2306.7 - Shear walls sheathed with other materials

Current through Register 1525, July 5, 2024
Shear walls sheathed with portland cement plaster, gypsum
				  lath, gypsum sheathing or gypsum board shall be designed and constructed in
				  accordance with AF & PA SDPWS. Shear walls sheathed with these materials
				  are permitted to resist horizontal forces using the allowable shear capacities
				  set forth in Table 2306.7. Shear walls sheathed with portland cement plaster,
				  gypsum lath, gypsum sheathing or gypsum board shall not be used to resist
				  seismic forces in structures assigned to
Seismic Design
				  Category
E or F.
TABLE 2306.7
ALLOWABLE SHEAR FOR WIND OR
				  SEISMIC FORCES FOR SHEAR WALLS OF LATH
AND PLASTER OR GYPSUM BOARD
				  WOOD FRAMED WALL ASSEMBLIES
TYPE OF MATERIAL
THICKNESS OF MATERIAL
WALL
CONSTRUCTION
FASTENER SPACINGb MAXIMUM (inches)
SHEAR VALUEa, e
(plf)
MINIMUM
FASTENER SIZEc, d, j,
							 k
1. Expanded metal or woven wire lath and portland
								cement plaster
7/8"
Unblocked
6
180
No. 11 gage 11/2" long, 7/16" head No. 16 gage galv.
							 staple, 7/8" legs
2. Gypsum lath, plain or perforated with vertical
								joints staggered
3/8" lath and
1/2" plaster
Unblocked
5
180
No. 13 gage galv. 11/8" long, 19/64" head,
							 plasterboard nail
3/8" lath and
Unblocked
5
100
No. 16 gage galv. staple 11/8" long,
3. Gypsum lath, plain or perforated
1/2" plaster
0.120" nail min.3/8" head, 11/4 long
1/2" × 2" × 8"
Unblocked
4
75
No. 11 gage, 13/4" long, 7/16" head,
							 diamond-point, galvanized
1/2" × 4"
Blockedd
Unblocked
4
7
175
100
4. Gypsum sheathing
16 Ga. Galv. Stable, 13/4" long
5/8" × 4"
Blocked
4" edge/7" field
200
6d galvanized 0.120' Nail, min.3/8" head, 13/4"
							 long
Unblockedf
7
75
Unblockedf
4
110
Unblocked
7
100
5d cooler (15/8" × 0.086") or
							 wallboard
0.120" nail, min.3/8× head, 11/2" long
No. 16 gage galv. staple, 11/2" long
Unblocked
4
125
Blockedg
7
125
1/2"
Blockedg
4
150
Unblocked
8/12h
60
Blockedg
4/16h
160
Blockedf, g
4/12h
155
No. 6-11/4" screwsi
Blockedg
8/12h
70
5. Gypsum board, gypsum veneer base or
								water-resistant gypsum backing board
Blockedg
6/12h
90
7
115
Unblockedf
4
145
6d cooler (17/8" × 0.092") or wallboard
0.120" nail, min. 3/8" head, 13/4" long
Blockedg
7
145
No. 16 gage galv. staple, 11/2" legs,
							 15/8" long
4
175
5/8"
Blockedg
Two-ply
Base ply: 9
Face ply: 7
250
Base ply-6d cooler (17/8" × 0.092")
							 or wallboard 13/4" × 0.120" nail, min. 3/8'
head 15/8" 16
							 gage galv. staple
Face ply-8d cooler (23/8" × 0.113") or
							 wallboard 0.120" nail, min.3/8 " head, 23/8" long No. 15 gage galv. staple,
							 21/4" long
Unblocked
8/12h
70
No. 61/4"-1screwsi
Blockedg
8/12h
90
For SI: 1 inch = 25.4 mm, 1 pound per linear foot =
							 14.5939 N/m.
a. These shear walls shall not be used to resist loads
							 imposed by masonry or concrete walls (see Section 4.1.5 of AF & PA SDPWS).
							 Values shown are for short-term loading due to wind or seismic loading. Walls
							 resisting seismic loads shall be subject to the limitations in Section 12.2.1
							 of ASCE 7. Values shown shall be reduced 25 percent for normal loading.
b. Applies to fastening at studs, top and bottom
							 plates and blocking.
c. Alternate fasteners are permitted to be used if
							 their dimensions are not less than the specified dimensions. Drywall screws are
							 permitted to substitute for the 5d (15/8" × 0.086"), and 6d (17/8"
							 × 0.092")(cooler) nails listed above, and No. 6 11/4 inch Type S or W
							 screws for 6d (17/8" × 0.092) (cooler) nails.
d. For properties of cooler nails, see ASTM C
							 514.
e. Except as noted, shear values are based on a
							 maximum framing spacing of 16 inches on center.
f. Maximum framing spacing of 24 inches on
							 center.
g. All edges are blocked, and edge fastening is
							 provided at all supports and all panel edges.
h. First number denotes fastener spacing at the edges;
							 second number denotes fastener spacing at intermediate framing members.
i. Screws are Type W or S.
j. Staples shall have aminimum crown width of 7/16
							 inch, measured outside the legs, and shall be installed with their crowns
							 parallel to the long dimension of the framing members.
k. Staples for the attachment of gypsum lath and
							 woven-wire lath shall have a minimum crown width of 3/4 inch, measured outside
							 the legs.