WSR 21-08-080
EXPEDITED RULES
BUILDING CODE COUNCIL
[Filed April 7, 2021, 8:19 a.m.]
Title of Rule and Other Identifying Information: Chapter 51-51 WAC, making editorial corrections to the state amendments to the 2018 International Residential Code.
Purpose of the Proposal and Its Anticipated Effects, Including Any Changes in Existing Rules: Making editorial changes, correcting tables and references to state amendments.
WAC
Section
Changes in 2018
Discussion
51-51-0507
R507.5
Correct reference tables
Omission missed
51-51-0507
Table
R507.5
Corrected header
Editorial change
51-51-0507
Tables
R507.5 (1-4)
Deleted
Omission missed
51-51-0507
Table
R507.9.1.3 (1)
Formatted table
Editorial change
Reasons Supporting Proposal: After adoption and publication of the amendments to the 2018 Residential Code, chapter 51-51 WAC, errors and omissions of an editorial nature were discovered; these must be corrected to ensure consistent enforcement of the code.
Statutory Authority for Adoption: RCW 19.27.074.
Statute Being Implemented: RCW 19.27.074.
Rule is not necessitated by federal law, federal or state court decision.
Name of Proponent: Governmental.
Name of Agency Personnel Responsible for Drafting and Implementation: Ray Shipman, 1500 Jefferson Street S.E., Olympia, WA, 360-407-8047; Enforcement: Local jurisdictions.
This notice meets the following criteria to use the expedited adoption process for these rules:
Corrects typographical errors, make address or name changes, or clarify language of a rule without changing its effect.
NOTICE
THIS RULE IS BEING PROPOSED UNDER AN EXPEDITED RULE-MAKING PROCESS THAT WILL ELIMINATE THE NEED FOR THE AGENCY TO HOLD PUBLIC HEARINGS, PREPARE A SMALL BUSINESS ECONOMIC IMPACT STATEMENT, OR PROVIDE RESPONSES TO THE CRITERIA FOR A SIGNIFICANT LEGISLATIVE RULE. IF YOU OBJECT TO THIS USE OF THE EXPEDITED RULE-MAKING PROCESS, YOU MUST EXPRESS YOUR OBJECTIONS IN WRITING AND THEY MUST BE SENT TO Stoyan Bumbalov, State Building Code Council, 1500 Jefferson Street S.E., phone 360-407-9277, email Stoyan.Bumbalov@des.wa.gov, AND RECEIVED BY June 7, 2021.
March 31, 2021
Diane Glen
Council Chair
OTS-2975.1
AMENDATORY SECTION(Amending WSR 20-21-041, filed 10/13/20, effective 11/13/20)
WAC 51-51-0507Section R507—Decks.
R507.1 Decks. Wood-framed decks shall be in accordance with this section. Decks shall be designed for the live load required in Section R301.5 or the ground snow load indicated in Table R301.2(1), whichever is greater. For decks using materials and conditions not prescribed in this section, refer to Section R301.
TABLE R507.3.1
MINIMUM FOOTING SIZE FOR DECKS
LIVE OR GROUND SNOW LOADb
(psf)
TRIBUTARY AREAc
(sq.ft.)
SOIL BEARING CAPACITYacd
1500 psf
2000 psf
≥ 3000 psf
Side of a square footing
(inches)
Diameter of a round footing
(inches)
Thicknessf
(inches)
Side of a square footing
(inches)
Diameter of a round footing
(inches)
Thicknessf
(inches)
Side of a square footing
(inches)
Diameter of a round footing
(inches)
Thicknessf
(inches)
60 Live or 70 Ground Snow Load
5
7
8
6
7
8
6
7
8
6
20
12
14
6
11
13
6
9
10
6
40
18
20
6
15
17
6
12
14
6
60
21
24
8
19
21
6
15
17
6
80
25
28
9
21
24
8
18
20
6
100
28
31
11
24
27
9
20
22
7
120
30
34
12
26
30
10
21
24
8
140
33
37
13
28
32
11
23
26
9
160
35
40
15
30
34
12
25
28
9
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa.
a.
Interpolation permitted, extrapolation not permitted.
b.
Reserved.
c.
Footing dimensions shall allow complete bearing of the post.
d.
If the support is a brick or CMU pier, the footing shall have a minimum 2-inch projection on all sides.
e.
Area, in square feet, of deck surface supported by post and footings.
f.
Minimum thickness shall only apply to plain concrete footings,
R507.4 Deck posts. For single-level decks, wood post size shall be in accordance with Table R507.4.
TABLE R507.4
DECK POST HEIGHT
LOADSb
(psf)
POST SPECIESc
POST SIZEd
MAXIMUM DECK POST HEIGHTa
(feet-inches)
Tributary Areag,h
(sq. ft.)
20
40
60
80
100
120
140
160
60 Live Load,
≤60 Ground Snow Load
Douglas Fire, Hem-fire, SPFe
4 x 4
14-0
10-10
8-7
7-0
5-8
4-1
NP
NP
4 x 6
14-0
13-10
11-1
9-5
8-2
7-3
6-4
5-4
6 x 6
14-0
14-0
14-0
14-0
14-0
13-3
10-9
6-11
8 x 8
14-0
14-0
14-0
14-0
14-0
14-0
14-0
14-0
Redwoodf, Western Cedarsf, Ponderosa Pinef, Red Pinef
4 x 4
14-0
10-3
7-0
NP
NP
NP
NP
NP
4 x 6
14-0
13-6
10-6
8-4
5-10
NP
NP
NP
6 x 6
14-0
14-0
14-0
14-0
11-11
NP
NP
NP
8 x 8
14-0
14-0
14-0
14-0
14-0
14-0
14-0
14-0
70 Ground Snow Load
Douglas Fire, Hem-fire, SPFe
4 x 4
14-0
10-1
7-11
6-6
5-3
3-7
NP
NP
4 x 6
14-0
12-10
10-3
8-9
7-7
6-8
5-10
4-11
6 x 6
14-0
14-0
14-0
14-0
14-0
12-2
9-9
5-9
8 x 8
14-0
14-0
14-0
14-0
14-0
14-0
14-0
14-0
Redwoodf, Western Cedarsf, Ponderosa Pinef, Red Pinef
4 x 4
14-0
9-5
6-5
NP
NP
NP
NP
NP
4 x 6
14-0
12-6
9-8
7-7
5-3
NP
NP
NP
6 x 6
14-0
14-0
14-0
14-0
10-8
NP
NP
NP
8 x 8
14-0
14-0
14-0
14-0
14-0
14-0
14-0
14-0
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa, NP = Not permitted.
a.
Measured from the underside of the beam to top of footing or pier.
b.
10 psf dead load. Snow load not assumed to be concurrent with live load.
c.
No. 2 grade, wet service factor included.
d.
Notched deck posts shall be sized to accommodate beam size per in accordance with Section R507.5.2.
e.
Includes incising factor.
f.
Incising factor not included.
g.
Area, in square feet, of deck surface supported by post and footing.
h.
Interpolation permitted. Extrapolation not permitted.
R507.5 Deck beams. Maximum allowable spans for wood deck beams, as shown in Figure R507.5, shall be in accordance with Table((s)) R507.5(((1) through R507(4))). Beam plies shall be fastened with two rows of 10d (3-inch × 0.128-inch) nails minimum at 16 inches (406 mm) on center along each edge. Beams shall be permitted to cantilever at each end up to one-fourth of the allowable beam span. Deck beams of other materials shall be permitted where designed in accordance with accepted engineering practices.
TABLE R507.5
MAXIMUM DECK BEAM SPAN - 60 PSF LIVE LOAD or
70 PSF GROUND SNOW LOADc
((BEAM SPECIESd
BEAM SIZEe
MAXIMUM BEAM SPANa,b,f
(feet-inches)
Deck Joist Spana,i
(feet)
6
8
10
12
14
16
18))
BEAM SPECIESd
BEAM SIZEe
DECK JOIST SPANa,i
(feet)
6
8
10
12
14
16
18
 
MAXIMUM BEAM SPANa,b,f
(feet-inches)
Douglas fir-larchg,
Hem-firg,
Spruce-pine-firg
1-2×6
3-5
2-10
2-5
2-2
2-0
1-10
1-9
1-2×8
4-7
3-8
3-2
2-10
2-7
2-5
2-4
1-2×10
5-8
4-9
4-1
3-8
3-4
3-1
2-11
1-2×12
6-7
5-8
5-0
4-6
4-1
3-10
3-7
2-2×6
5-2
4-6
4-0
3-5
3-1
2-10
2-7
2-2×8
6-11
6-0
5-3
4-7
4-1
3-8
3-5
2-2×10
8-5
7-4
6-6
5-10
5-2
4-9
4-5
2-2×12
9-10
8-6
7-7
6-11
6-4
5-9
5-4
3-2×6
6-6
5-7
5-0
4-7
4-2
3-9
3-5
3-2×8
8-8
7-6
6-8
6-1
5-6
5-0
4-7
3-2×10
10-7
9-2
8-2
7-6
6-11
6-4
5-10
3-2×12
12-4
10-8
9-7
8-9
8-1
7-7
7-1
Redwoodh, Western Cedarsh, Ponderosa Pineh, Red Pineh
1-2×6
3-6
2-11
2-6
2-3
2-0
1-11
1-9
1-2×8
4-6
3-10
3-3
2-11
2-8
2-6
2-4
1-2×10
5-6
4-9
4-2
3-9
3-5
3-2
3-0
1-2×12
6-4
5-6
4-11
4-6
4-2
3-11
3-8
2-2×6
5-3
4-7
4-1
3-6
3-2
2-11
2-8
2-2×8
6-8
5-9
5-2
4-8
4-2
3-10
3-6
2-2×10
8-2
7-1
6-4
5-9
5-4
4-10
4-6
2-2×12
9-5
8-2
7-4
6-8
6-2
5-9
5-5
3-2×6
6-4
5-8
5-1
4-8
4-3
3-10
3-6
3-2×8
8-4
7-3
6-5
5-11
5-5
5-1
4-8
3-2×10
10-2
8-10
7-11
7-2
6-8
6-3
5-11
3-2×12
11-10
10-3
9-2
8-4
7-9
7-3
6-10
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a.
Interpolation allowed. Extrapolation is not allowed.
b.
Beams supporting a single span of joists with or without cantilever.
c.
Dead load = 10 psf, L/Δ = 360 at mainspan, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
d.
No. 2 grade, wet service factor included.
e.
Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
f.
Beam cantilevers are limited to the adjacent beam's span divided by 4.
g.
Includes incising factor.
h.
Incising factor not included.
i.
Deck joist span as shown in Figure R507.5.
((TABLE R507.5(1)
MAXIMUM DECK BEAM SPAN – 40 PSF LIVE LOAD (NOT ADOPTED)
TABLE R507.5(2)
MAXIMUM DECK BEAM SPAN – 50 PSF LIVE LOAD (NOT ADOPTED)
TABLE R507.5(3)
MAXIMUM DECK BEAM SPAN – 60 PSF LIVE LOADc
BEAM SPECIESd
BEAM SIZEe
DECK JOIST SPANa,i
(feet)
6
8
10
12
14
16
18
MAXIMUM BEAM SPANa,b,f
(feet-inches)
Douglas fir-larchg, Spruce-pine-firg
1-2×6
3-8
3-1
2-8
2-4
2-2
2-0
1-10
1-2×8
5-0
4-1
3-6
3-1
2-10
2-7
2-5
1-2×10
6-1
5-2
4-6
4-0
3-7
3-4
3-2
1-2×12
7-1
6-1
5-5
4-10
4-5
4-1
3-10
2-2×6
5-6
4-9
4-3
3-10
3-5
3-1
2-10
2-2×8
7-5
6-5
5-9
5-0
4-6
4-1
3-9
2-2×10
9-0
7-10
7-0
6-4
5-9
5-2
4-10
2-2×12
10-6
9-1
8-1
7-5
6-10
6-4
5-10
3-2×6
6-11
6-0
5-4
4-11
4-6
4-2
3-10
3-2×8
9-3
8-0
7-2
6-6
6-1
5-6
5-0
3-2×10
11-4
9-10
8-9
8-0
7-5
6-11
6-5
3-2×12
13-2
11-5
10-2
9-4
8-7
8-1
7-7
Redwoodh, Western Cedarsh, Ponderosa Pineh, Red Pineh
1-2×6
6-9
3-2
2-9
2-5
2-2
2-0
1-11
1-2×8
4-10
4-2
3-7
3-2
2-11
2-8
2-6
1-2×10
5-10
5-1
4-6
4-1
3-8
3-5
3-3
1-2×12
6-10
5-11
5-3
4-10
4-5
4-2
3-11
2-2×6
5-7
4-10
4-4
3-11
3-6
3-2
2-11
2-2×8
7-1
6-2
5-6
5-0
4-7
4-2
3-10
2-2×10
8-8
7-6
6-9
6-2
5-8
5-4
4-11
2-2×12
10-1
8-9
7-10
7-2
6-7
6-2
5-10
3-2×6
6-8
6-1
5-5
5-0
4-7
4-3
3-11
3-2×8
8-9
7-9
6-11
6-4
5-10
5-5
5-2
3-2×10
10-11
9-5
8-5
7-8
7-2
6-8
6-3
3-2×12
12-8
10-11
9-9
8-11
8-3
7-9
7-3
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a.
Interpolation permitted. Extrapolation not permitted.
b.
Beams supporting a single span of joists with or without cantilever.
c.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
d.
No. 2 grade, wet service factor included.
e.
Beam depth shall be equal to or greater than the depth intersecting joist for a flush beam connection.
f.
Beam cantilevers are limited to the adjacent beam's span divided by 4.
g.
Includes incising factor.
h.
Incising factor not included.
i.
Deck joist span as shown in Figure R507.5.
TABLE R507.5(4)
MAXIMUM DECK BEAM SPAN – 70 PSF LIVE LOADc
BEAM SPECIESd
BEAM SIZEe
DECK JOIST SPANa,i
(feet)
6
8
10
12
14
16
18
MAXIMUM BEAM SPANa,b,f
(feet-inches)
Douglas fir-larchg, Spruce-pine-firg
1-2×6
3-5
2-10
2-5
2-2
2-0
1-10
1-9
1-2×8
4-7
3-8
3-2
2-10
2-7
2-5
2-4
1-2×10
5-8
4-9
4-1
3-8
3-4
3-1
2-11
1-2×12
6-7
5-8
5-0
4-6
4-1
3-10
3-7
2-2×6
5-2
4-6
4-0
3-5
3-1
2-10
2-7
2-2×8
6-11
6-0
5-3
4-7
4-1
3-8
3-5
2-2×10
8-5
7-4
6-6
5-10
5-2
4-9
4-5
2-2×12
9-10
8-6
7-7
6-11
6-4
5-9
5-4
3-2×6
6-6
5-7
5-0
4-7
4-2
3-9
3-5
3-2×8
8-8
7-6
6-8
6-1
5-6
5-0
4-7
3-2×10
10-7
9-2
8-2
7-6
6-11
6-4
5-10
3-2×12
12-4
10-8
9-7
8-9
8-1
7-7
7-1
Redwoodh, Western Cedarsh, Ponderosa Pineh, Red Pineh
1-2×6
3-6
2-11
2-6
2-3
2-0
1-11
1-9
1-2×8
4-6
3-10
3-3
2-11
2-8
2-6
2-4
1-2×10
5-6
4-9
4-2
3-9
3-5
3-2
3-0
1-2×12
6-4
5-6
4-11
4-6
4-2
3-11
3-8
2-2×6
5-3
4-7
4-1
3-6
3-2
2-11
2-8
2-2×8
6-8
5-9
5-2
4-8
4-2
3-10
3-6
2-2×10
8-2
7-1
6-4
5-9
5-4
4-10
4-6
2-2×12
9-5
8-2
7-4
6-8
6-2
5-9
5-5
3-2×6
6-4
5-8
5-1
4-8
4-3
3-10
3-6
3-2×8
8-4
7-3
6-5
5-11
5-5
5-1
4-8
3-2×10
10-2
8-2
7-11
7-2
6-8
6-3
5-11
3-2×12
11-10
10-3
9-2
8-4
7-9
7-3
7
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a.
Interpolation permitted. Extrapolation not permitted.
b.
Beams supporting a single span of joists with or without cantilever.
c.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
d.
No. 2 grade, wet service factor included.
e.
Beam depth shall be equal to or greater than the depth intersecting joist for a flush beam connection.
f.
Beam cantilevers are limited to the adjacent beam's span divided by 4.
g.
Includes incising factor.
h.
Incising factor not included.
i.
Deck joist span as shown in Figure R507.5.))
R507.6 Deck joists. Maximum allowable spans for wood deck joists, as shown in Figure R507.6, shall be in accordance with Table R507.6. The maximum joist spacing shall be limited by the decking materials in accordance with Table R507.7.
TABLE R507.6
MAXIMUM DECK JOIST SPANS
LOADa
(psf)
JOIST
SPECIESb
JOIST SIZE
ALLOWABLE JOIST SPANb,c
(feet-inches)
MAXIMUM CANTILEVERf,g
(feet-inches)
Joist Spacing
(inches)
Adjacent Joist Back Spang
(feet)
12
16
24
4
6
8
10
12
14
16
18
60 Live Load or
70 Ground Snow Load
Douglas fir-larche, Hem-fire,
Spruce-pine-fire
2×6
7-11
7-1
5-9
1-0
1-6
NP
NP
NP
NP
NP
NP
2×8
10-5
9-5
7-8
1-0
1-6
2-0
2-1
NP
NP
NP
NP
2×10
13-3
11-6
9-5
1-0
1-6
2-0
2-6
2-8
NP
NP
NP
2×12
15-5
13-4
10-11
1-0
1-6
2-0
2-6
3-0
3-3
NP
NP
Redwoodf, Western Cedarsf, Ponderosa Pinef,
Red Pinef
2×6
7-4
6-8
5-10
1-0
1-4
NP
NP
NP
NP
NP
NP
2×8
9-8
8-10
7-4
1-0
1-6
1-11
NP
NP
NP
NP
NP
2×10
12-4
11-0
9-0
1-0
1-6
2-0
2-6
2-6
NP
NP
NP
2×12
14-9
12-9
10-5
1-0
1-6
2-0
2-6
3-0
3-0
NP
NP
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg, NP = Not permitted.
a.
Dead load = 10 psf dead load. Snow load not assumed to be concurrent with live load.
b.
No. 2 grade, wet service factor included.
c.
L/Δ = 360 at main span.
d.
L/Δ = 180 at cantilever with 220-pound point load applied to end.
e.
Includes incising factor.
f.
Incising factor not included.
g.
Interpolation permitted. Extrapolation not permitted.
R507.9.1.2 Band joist details. Band joists supporting a ledger shall be a minimum 2-inch-nominal (51 mm), solid-sawn, spruce-pine-fir or better lumber or minimum 1-inch (25 mm) nominal engineered wood rim boards in accordance with Section R502.1.7. Band joists shall bear fully on the primary structure capable of supporting all required loads.
TABLE R507.9.1.3(1)
DECK LEDGER CONNECTION TO BAND JOIST
LOADc
(psf)
JOIST SPANa
(feet)
On-CENTER SPACING OF FASTENERSb
(inches)
1/2-inch diameter lag screw
with
1/2-inch maximum sheathingd,e
1/2-inch diameter bolt
with
1/2-inch maximum sheathinge
1/2-inch diameter bolt
with
1-inch maximum sheathingf
60 Live Load or
70 Ground Snow Load
6
22
36
35
8
16
31
26
10
13
25
21
12
11
20
17
14
9
17
15
16
8
15
13
18
7
13
11
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
a.
Interpolation permitted. Extrapolation is not permitted.
b.
Ledgers shall be flashed in accordance with Section R703.4 to prevent water from contacting the house band joist.
c.
Dead load = 10 psf. Snow load shall not be assumed to act concurrently with live load.
d.
The tip of the lag screw shall fully extend beyond the inside face of the band joist.
e.
Sheathing shall be wood structural panel or solid sawn lumber.
f.
Sheathing shall be permitted to be wood structural panel, gypsum board, fiberboard, lumber or foam sheathing. Up to 1/2-inch thickness of stacked washers shall be permitted to substitute for up to 1/2 inch of allowable sheathing thickness where combined with wood structural panel or lumber sheathing.
R507.9.2 Deck lateral load connections. Lateral loads shall be transferred to the ground or to a structure capable of transmitting them to the ground. Where the lateral load connection is provided in accordance with Figure R507.9.2(1), hold-down tension devices shall be installed in not less than two locations per deck, within 24 inches of each end of the deck. Each device shall have an allowable stress design capacity of not less than 1500 pounds (6672 N). Where the lateral load connections are provided in accordance with Figure R507.9.2(2), the hold-down tension devices shall be installed in not less than four locations per deck, and each device shall have an allowable stress design capacity of not less than 750 pounds (3336 N).
EXCEPTION:
Decks not more than 30 inches above grade at any point may be unattached.
TABLE R507.9.1
PLACEMENT OF LAG SCREWS AND BOLTS IN DECK LEDGERS AND BAND JOISTS
MINIMUM END AND EDGE DISTANCES AND SPACING
BETWEEN ROWS
 
TOP
EDGE
BOTTOM
EDGE
ENDS
ROW
SPACING
Ledgera
2 inchesd
3/4 inch
2 inchesb
1 5/8 inchesb
Band joistc
3/4 inch
2 inchese
2 inchesb
1 5/8 inchesb
For SI:
1 inch = 25.4 mm.
a
Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger in accordance with Figure R507.2.1(1).
b
Maximum 5 inches.
c
For engineered rim joists, the manufacturer's recommendations shall govern.
d
The minimum distance from bottom row of lag screws to the top edge of the ledger shall be in accordance with Figure R507.2.1(1).
e
The 2 inches may be reduced to 3/4 inch when the band joist is directly supported by a mudsill, a header or by double top wall plates.
TABLE R507.9.3(1)
DECK LEGER CONNECTION TO BAND JOIST
LOADc
(psf)
JOIST SPANa
(feet)
1/2-inch diameter leg screw with 1/2-inch maximum sheathingd,e
1/2-inch diameter bolt with 1/2-inch maximum sheathinge
1/2-inch diameter bolt with
1-inch maximum sheathingf
ON-CENTER SPACING OF FASTENERSb
(inches)
60 Ground Snow Load
6
25
36
36
8
18
35
30
10
15
28
24
12
12
23
20
14
10
20
17
16
9
17
15
18
8
15
13
70 Ground Snow Load
6
22
36
35
8
16
31
26
10
13
25
21
12
11
20
17
14
9
17
15
16
8
15
13
18
7
13
11
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
a.
Interpolation permitted. Extrapolation not permitted.
b.
Legers shall be flashed in accordance with Section R703.4 to prevent water from contacting the house band joist.
c.
Dead Load = 10 psf. Snow load shall not be assumed to act concurrently with live load.
d.
The tip of the lag screw shall fully extend beyond the inside face of the band joist.
e.
Sheathing shall be wood structural panel or solid sawn lumber.
f.
Sheathing shall be permitted to be wood structural panel, gypsum board, fiberboard, lumber or foam sheathing. Up to 1/2 inch thickness of stacked washers shall be permitted to substitute for up to 1/2 inch of allowable sheathing thickness where combined with wood structural panel or lumber sheathing.