Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 23 - Wood › Section 2304 - GENERAL CONSTRUCTION REQUIREMENTS › Subsection 2304.9 - Connections and fasteners

Current through Register 1525, July 5, 2024
2304.9.1
Fastener requirements.
Connections for wood members shall be designed in accordance with the
				appropriate methodology in Section 2301.2. The number and size of fasteners
				connecting wood members shall not be less than that set forth in Table
				2304.9.1.
TABLE 2304.9.1 FASTENING SCHEDULE
CONNECTION
FASTENINGa,
							 m
LOCATION
1. Joist to sill or girder
3 - 8d common (2 1/2" × 0.131")
3 -
							 3" × 0.131"nails
3 - 3"14 gage staples
toenail
2.Bridging to joist
2 - 8d common (2 1/2" × 0.131")
2 -
							 3" × 0.131"nails
2 - 3"14 gage staples
toenail each end
3. 1" × 6"subfloor or less to each joist
2 - 8d common (2 1/2" × 0.131")
face nail
4. Wider than 1" × 6"subfloor to each joist
3 - 8d common (2 1/2" × 0.131")
face nail
5. 2" subfloor to joist or girder
2 - 16d common (3 1/2" × 0.162")
blind and face nail
6. Sole plate to joist or blocking
16d (31/2" × 0.135") at 16"o.c.
3"
							 × 0.131"nails at 8"o.c.
3"14 gage staples at 12"o.c.
typical face nail
Sole plate to joist or blocking at braced
wall panel
3- 16d (31/2" × 0.135") at 16"o.c.
4 - 3" × 0.131"nails at 16"o.c.
4 - 3"14 gage staples at
							 16"o.c.
braced wall panels
7. Top plate to stud
2 - 16d common (31/2" × 0.162")
3 -
							 3" × 0.131"nails
3 - 3"14 gage staples
end nail
8. Stud to sole plate
4 - 8d common (21/2" × 0.131")
4 -
							 3" × 0.131"nails
3 - 3"14 gage staples
toenail
2 - 16d common (31/2" × 0.162")
3 -
							 3" × 0.131"nails
3 - 3"14 gage staples
end nail
9. Double studs
16d (3 1/2" × 0.135") at 24"o.c.
3"
							 × 0.131"nail at 8"o.c.
3"14 gage staple at 8"o.c.
face nail
10. Double top plates
16d (3 1/2" * 0.135") at 16"o.c.
3"
							 × 0.131"nail at 12"o.c.
3"14 gage staple at 12"o.c.
typical face nail
Double top plates
8 - 16d common (31/2" × 0.162")
12
							 - 3" × 0.131"nails
12 - 3"14 gage staples
lap splice
11. Blocking between joists or rafters to top
							 plate
3 - 8d common (2 1/2" × 0.131")
3 -
							 3" × 0.131"nails
3 - 3"14 gage staples
toenail
12. Rim joist to top plate
8d (2 1/2" × 0.131") at 6"o.c.
3"
							 × 0.131"nail at 6"o.c.
3"14 gage staple at 6"o.c.
toenail
13. Top plates, laps and intersections
2 - 16d common (3 1/2" × 0.162")
3 -
							 3" × 0.131"nails
3 - 3"14 gage staples
face nail
14. Continuous header, two pieces
16d common (3 1/2" × 0.162")
16"o.c. along edge
15. Ceiling joists to plate
3 - 8d common (2 1/2" × 0.131")
5 -
							 3" × 0.131"nails
5 - 3"14 gage staples
toenail
16. Continuous header to stud
4 - 8d common (21/2" × 0.131")
toenail
17. Ceiling joists, laps over partitions
(see Section 2308.10.4.1, Table 2308.10.4.1)
3 - 16d common (3 1/2" × 0.162") minimum,
Table 2308.10.4.1
4 - 3" × 0.131" nails
4 - 3"14 gage staples
face nail
18. Ceiling joists to parallel rafters
(see Section 2308.10.4.1, Table 2308.10.4.1)
3 - 16d common (3 1/2" × 0.162") minimum,
Table 2308.10.4.1
4 - 3" × 0.131" nails
4 - 3"14 gage staples
face nail
19. Rafter to plate (see Section 2308.10.1, Table
							 2308.10.1)
3 - 8d common (2 1/2" × 0.131")
3 -
							 3" ×0.131" nails
3 - 3"14 gage staples
toenail
20. 1"diagonal brace to each stud and plate
2 - 8d common (2 1/2" × 0.131")
2 -
							 3" ×0.131" nails
3 - 3'14 gage staples
face nail
21. 1" × 8"sheathing to each bearing
3 - 8d common (2 1/2" × 0.131")
face nail
22. Wider than 1" × 8"sheathing to each
							 bearing
3 - 8d common (2 1/2" × 0.131")
face nail
23. Built-up corner studs
16d common (3 1/2" × 0.162")
3"
							 × 0.131" nails
3"14 gage staples
24"o.c.
16"o.c.
16"o.c.
24. Built-up girder and beams
20d common (4" × 0.192") 32'o.c.
3"
							 × 0.131" nail at 24"o.c.
3"14 gage staple at 24"o.c.
face nail at top and bottom staggered on opposite
							 sides
2 - 20d common (4" × 0.192")
3 - 3"
							 × 0.131" nails
3 - 3"14 gage staples
face nail at ends and at each splice
25. 2"planks
16d common (3 1/2" × 0.162")
at each bearing
26. Collar tie to rafter
3 - 10d common (3" × 0.148")
4 - 3"
							 ×0.131" nails
4 - 3"14 gage staples
face nail
27. Jack rafter to hip
3 - 10d common (3" × 0.148")
4 - 3"
							 × 0.131" nails
4 - 3"14 gage staples
toenail
2 - 16d common (3 1/2" × 0.162")
3 -
							 3" × 0.131" nails
3 - 3"14 gage staples
face nail
28. Roof rafter to 2-by ridge beam
2 - 16d common (3 1/2" × 0.162")
3 -
							 3" × 0.131" nails
3 - 3"14 gage staples
toenail
2 -16d common (3 1/2" × 0.162")
3 -
							 3" × 0.131" nails
3 - 3"14 gage staples
face nail
29. Joist to band joist
3 - 16d common (3 1/2" ×0.162")
4 -
							 3" × 0.131" nails
4 - 3"14 gage staples
face nail
30. Ledger strip
3 - 16d common (3 1/2" × 0.162")
4
							 - 3" × 0.131" nails
4 - 3" 14 gage staples
face nail at each joist
31. Wood structural panels and particleboardb
Subfloor, roof and wall sheathing (to framing)
1/2" and less6dc,
							 1
2 3/8"× 0.113"
							 nailn
13/4' 16 gage
							 stapleo
19/32" to 3/4" 8dd or
							 6de
2 3/8" × 0.113" nailp
2" 16 gage staplep
7/8" to 1" 8dc
11/8" to 11/4" 10dd or
							 8de
Single floor (combination subfloor-underlayment
3/4" and less 6de
to framing
7/8" to 1" 8de
11/8" to 11/4" 10dd or
							 8de
32. Panel siding (to framing)
1/2" or less 6df
5/8" 8df
33. Fiberboard sheathingg
1/2" No. 11 gage roofing
							 nailh
6d common nail (2" × 0.113")
No. 16 gage staplei
25/32" No. 11 gage roofing nailh
8d common nail (2 1/2" × 0.131")
No. 16 gage staplei
34. Interior paneling
1/4" 4dj
3/8" 6dk
For SI: 1 inch = 25.4 mm.
a. Common or box nails are permitted to be used except
							 where otherwise stated.
b. Nails spaced at 6 inches on center at edges, 12
							 inches at intermediate supports except 6 inches at supports where spans are 48
							 inches or more. For nailing of wood structural panel and particleboard
							 diaphragms and shear walls, refer to Section 2305. Nails for wall sheathing are
							 permitted to be common, box or casing.
c. Common or deformed shank (6d - 2" × 0.113";
							 8d - 2 1/2" × 0.131"; 10d - 3" × 0.148").
d. Common (6d - 2" × 0.113"; 8d - 2 1/2" ×
							 0.131"; 10d - 3" × 0.148").
e. Deformed shank (6d - 2" × 0.113"; 8d - 2 1/2"
							 × 0.13 1"; 10d - 3" × 0.148").
f. Corrosion-resistant siding (6d - 17/8" ×
							 0.106"; 8d - 23/8" × 0.128") or casing (6d - 2" × 0.099"; 8d - 2
							 1/2" × 0.113") nail.
g. Fasteners spaced 3 inches on center at exterior
							 edges and 6 inches on center at intermediate supports, when used as structural
							 sheathing. Spacing shall be 6 inches on center on the edges and 12 inches on
							 center at intermediate supports for nonstructural applications.
h. Corrosion-resistant roofing nails with
							 7/16-inch-diameter head and 11/2-inch length for 1/2-inch sheathing and 1
							 3/4-inch length for 25/32-inch sheathing.
i. Corrosion-resistant staples with nominal 7/16-inch
							 crown or 1-inch crown and 11/4-inch length for 1/2-inch sheathing and 11/2-inch
							 length for 25/32-inch sheathing. Panel supports at 16 inches (20 inches if
							 strength axis in the long direction of the panel, unless otherwise
							 marked).
j. Casing (11/2" × 0.080") or finish (11/2"
							 × 0.072") nails spaced 6 inches on panel edges, 12 inches at intermediate
							 supports.
k. Panel supports at 24 inches. Casing or finish nails
							 spaced 6 inches on panel edges, 12 inches at intermediate supports.
l. For roof sheathing applications, 8d nails (21/2"
							 × 0.113") are the minimum required for wood structural panels.
m. Staples shall have a minimum crown width of 7/16
							 inch.
n. For roof sheathing applications, fasteners spaced 4
							 inches on center at edges, 8 inches at intermediate supports.
o. Fasteners spaced 4 inches on center at edges, 8
							 inches at intermediate supports for subfloor and wall sheathing and 3 inches on
							 center at edges, 6 inches at intermediate supports for roof sheathing.
p. Fasteners spaced 4 inches on center at edges, 8
							 inches at intermediate supports.
2304.9.2
Sheathing fasteners.
Sheathing nails or other
approved
sheathing connectors shall
				be driven so that their head or crown is flush with the surface of the
				sheathing.
2304.9.3
Joist
				hangers and framing anchors.
Connections depending on joist hangers or
				framing anchors, ties and other mechanical fastenings not otherwise covered are
				permitted where
approved
. The vertical load-bearing capacity,
				torsional moment capacity and deflection characteristics of joist hangers shall
				be determined in accordance with Section 1716.1.
2304.9.4
Other fasteners.
Clips,
				staples, glues and other
approved
methods of fastening are
				permitted where
approved
.
2304.9.5
Fasteners and connectors in
				contact with preservative-treated and fire-retardant-treated wood.
Fasteners and connectors in contact with
preservative-treated
and
fire-retardant-treated wood
shall be in accordance with
				Sections 2304.9.5.1 through 2304.9.5.4. The coating weights for zinc-coated
				fasteners shall be in accordance with ASTM A 153.
2304.9.5.1
Fasteners and connectors for
				preservative-treated wood.
Fasteners in contact with
preservative-treated wood
shall be of hot-dipped zinc-coated
				galvanized steel, stainless steel, silicon bronze or copper. Fasteners other
				than nails, timber rivets, wood screws and lag screws shall be permitted to be
				of mechanically deposited zinc-coated steel with coating weights in accordance
				with ASTM B 695, Class 55 minimum. Connectors that are used in exterior
				applications and in contact with
preservative-treated wood
shall have coating types and weights in accordance with the treated wood or
				connector manufacturer's recommendations. In the absence of manufacturer's
				recommendations, a minimum of ASTM A 653, type G185 zinc-coated galvanized
				steel, or equivalent, shall be used.
Exception:
Plain carbon steel fasteners in
				  SBX/DOT and zinc borate
preservative-treated wood
in an
				  interior, dry environment shall be permitted.
2304.9.5.2
Fastenings for wood
				foundations.
Fastenings for wood foundations shall be as required in AF
				& PA PWF.
2304.9.5.3
Fasteners for fire-retardant-treated wood used in exterior applications or wet
				or damp locations.
Fasteners for
fire-retardant-treated
				wood
used in exterior applications or wet or damp locations shall be
				of hot-dipped zinc-coated galvanized steel, stainless steel, silicon bronze or
				copper. Fasteners other than nails, timber rivets, wood screws and lag screws
				shall be permitted to be of mechanically deposited zinc-coated steel with
				coating weights in accordance with ASTM B 695, Class 55 minimum.
2304.9.5.4
Fasteners for
				fire-retardant-treated wood used in interior applications.
Fasteners for
fire-retardant-treated wood
used in interior locations shall
				be in accordance with the manufacturer's recommendations. In the absence of
				manufacturer's recommendations, Section 2304.9.5.3 shall apply.