Implementation of the “comply or explain rule” (March 2015)

September 19, 2013
Re: Simpson Strong-Tie® Wood Strong-Wall® SB Shearwall: Wall Bracing Solutions for Wind
Supplement to T-SWPDG10
To Whom It May Concern:
This letter provides supplemental information to the Strong-Wall® Shearwalls Prescriptive Design Guide technical
bulletin (T-SWPDG10) for using the wood Strong-Wall SB shearwall (SWSB) to provide equivalent wall-bracing
solutions based on the requirements of the International Residential Code (IRC) and the Conventional Light-Frame
Construction Section 2308 of the International Building Code (IBC). This letter only applies to buildings located in a
“Wind” Jobsite Category as shown in T-SWPDG10 on pages 12 (IRC) and 83 (IBC).
Tables 1-4 on pages 2-5 list SWSB model numbers that provide the Equivalent Wall-Bracing Length as well as the
corresponding Anchorage Classification required.
Table 5 and Figure 1 on page 6 of this letter provide anchorage information specific to the SWSB. Refer to TSWPDG10 for embedment depths and foundation requirements for Slab on Grade, Brick Ledge, and Stemwall
foundation types.
Please note: the information in this letter is valid until 12/31/2014 when it will be re-evaluated by Simpson Strong-Tie.
For additional pertinent information, refer to T-SWPDG10 regarding the wall-bracing applications and C-L-SWSB13
regarding the SWSB. If you have any additional questions or need further assistance regarding this matter, please
contact the engineering department of Simpson Strong-Tie at 800.999.5099.
Sincerely,
SIMPSON STRONG-TIE COMPANY INC.
Page_1_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
Table 1: Supplement to T-SWPDG10, Page 20
Wall Selection and Anchorage Classification:
GARAGE-FRONT APPLICATIONS (7' to 8' Tall) for Wind
Anchorage Classification
Equivalent
WallSingle
Story
1st of 2- or 3-Story
Wall Model 1
Bracing
Conc. Strength (psi)
Conc. Strength (psi)
CMU
CMU
Length (ft)
2,500 3,000 3,500
2,500 3,000 3,500
2.5
4
6
SWSB12x7 w/Portal Kit
SWSB18x7 w/Portal Kit
SWSB12x7.5 w/Portal Kit
SWSB18x7.5 w/Portal Kit
SWSB12x8 w/Portal Kit
SWSB18x8 w/Portal Kit
SWSB24x8 w/Portal Kit
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
B
A
B
A
B
B
A
B
A
B
A
B
B
A
B
A
B
A
B
B
A
NS
NS
NS
NS
NS
NS
A
SWSB12x7 w/Portal Kit
B
B
B
B
C
C
C
NS
SWSB18x7 w/Portal Kit
SWSB12x7.5 w/Portal Kit
SWSB18x7.5 w/Portal Kit
SWSB12x8 w/Portal Kit
SWSB18x8 w/Portal Kit
SWSB24x8 w/Portal Kit
A
B
A
B
A
A
A
B
A
B
A
A
A
B
A
B
A
A
A
NS
A
NS
A
A
B
NS
B
NS
B
B
B
C
B
D
B
B
B
C
B
D
B
B
NS
NS
NS
NS
NS
B
SWSB12x7 w/Portal Kit
C
C
C
NS
NS
NS
D
NS
SWSB18x7 w/Portal Kit
SWSB12x7.5 w/Portal Kit
SWSB18x7.5 w/Portal Kit
SWSB12x8 w/Portal Kit
SWSB18x8 w/Portal Kit
SWSB24x8 w/Portal Kit
B
C
B
C
B
B
B
C
B
C
B
B
B
C
B
C
B
B
B
NS
B
NS
NS
B
C
NS
NS
NS
NS
C
C
NS
C
NS
D
C
C
D
C
NS
D
C
NS
NS
NS
NS
NS
C
1. Portal Kits are required for panel-to-header connections and are included with all model numbers shown.
2. See page 6 for anchor details and additional information.
3. See catalog C-L-SWSB13 for installation information and SWSB properties.
4. NS = No Solution
5. See general notes in technical bulletin T-SWPDG10 for additional information.
SWSB Portal Application
Page_2_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
Table 2: Supplement to T-SWPDG10, Page 21
Wall Selection and Anchorage Classification:
GARAGE-FRONT APPLICATIONS (9' to 11' Tall) for Wind
Anchorage Classification
Equivalent
WallSingle
Story
1st of 2- or 3-Story
Wall Model 1
Bracing
Conc. Strength (psi)
Conc. Strength (psi)
CMU
CMU
Length (ft)
2,500 3,000 3,500
2,500 3,000 3,500
2.5
4
6
SWSB12x9 w/Portal Kit
SWSB18x9 w/Portal Kit
SWSB24x9 w/Portal Kit
SWSB12x10 w/Portal Kit
SWSB18x10 w/Portal Kit
SWSB24x10 w/Portal Kit
SWSB12x11 w/Portal Kit
SWSB18x11 w/Portal Kit
SWSB24x11 w/Portal Kit
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
B
A
A
NS
A
A
NS
A
A
C
B
A
NS
B
B
NS
B
B
C
B
A
D
B
B
D
B
B
C
B
A
D
B
B
D
B
B
NS
NS
A
NS
NS
B
NS
NS
B
SWSB12x9 w/Portal Kit
C
C
C
NS
NS
NS
NS
NS
SWSB18x9 w/Portal Kit
SWSB24x9 w/Portal Kit
SWSB12x10 w/Portal Kit
SWSB18x10 w/Portal Kit
SWSB24x10 w/Portal Kit
SWSB12x11 w/Portal Kit
SWSB18x11 w/Portal Kit
SWSB24x11 w/Portal Kit
B
A
C
B
B
D
B
B
B
A
C
B
B
D
B
B
B
A
C
B
B
D
B
B
B
A
NS
B
B
NS
NS
B
C
B
NS
NS
C
NS
NS
C
C
B
NS
C
C
NS
D
C
C
B
NS
C
C
NS
D
C
NS
B
NS
NS
C
NS
NS
C
SWSB12x9 w/Portal Kit
NS
D
D
NS
NS
NS
NS
NS
SWSB18x9 w/Portal Kit
SWSB24x9 w/Portal Kit
SWSB18x10 w/Portal Kit
SWSB24x10 w/Portal Kit
SWSB18x11 w/Portal Kit
SWSB24x11 w/Portal Kit
C
B
C
B
C
C
C
B
C
B
C
C
C
B
C
B
C
C
NS
B
NS
B
NS
C
NS
C
NS
D
NS
D
NS
C
NS
D
NS
D
D
C
E
D
NS
D
NS
NS
NS
NS
NS
NS
1. Portal Kits are required for panel-to-header connections and must be ordered separately for the model numbers shown.
2. See page 6 for anchor details and additional information.
3. See catalog C-L-SWSB13 for installation information and SWSB properties.
4. NS = No Solution
5. See general notes in technical bulletin T-SWPDG10 for additional information.
SWSB Portal Application
Page_3_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
Table 3: Supplement to T-SWPDG10, Page 22
Wall Selection and Anchorage Classification:
FIRST-STORY-ON-FOUNDATION APPLICATION for Wind
Anchorage Classification
Equivalent
WallSingle Story
1st of 2- or 3-Story
Wall Model
Bracing
Conc. Strength (psi)
Conc. Strength (psi)
CMU
CMU
Length (ft)
2,500 3,000 3,500
2,500 3,000 3,500
SWSB12x8
SWSB18x8
SWSB24x8
SWSB12x9
SWSB18x9
SWSB24x9
SWSB12x10
SWSB18x10
SWSB24x10
SWSB12x11
SWSB18x11
SWSB24x11
SWSB12x12
SWSB18x12
SWSB24x12
B
A
A
B
A
A
B
A
A
B
A
A
C
B
A
B
A
A
B
A
A
B
A
A
B
A
A
C
B
A
B
A
A
B
A
A
B
A
A
B
A
A
C
B
A
B
A
A
B
A
A
B
A
A
B
A
A
C
B
A
C
B
A
C
B
A
D
B
B
D
B
B
NS
C
B
C
B
A
C
B
A
D
B
B
D
B
B
D
C
B
C
B
A
C
B
A
D
B
B
D
B
B
D
C
B
NS
B
A
NS
B
A
NS
NS
B
NS
NS
B
NS
NS
B
SWSB12x8
C
C
C
NS
NS
D
D
NS
SWSB18x8
SWSB24x8
SWSB12x9
SWSB18x9
SWSB24x9
SWSB12x10
SWSB18x10
SWSB24x10
SWSB12x11
SWSB18x11
SWSB24x11
SWSB12x12
SWSB18x12
SWSB24x12
B
A
C
B
A
C
B
B
D
B
B
D
B
B
B
A
C
B
A
C
B
B
D
B
B
D
B
B
B
A
C
B
A
C
B
B
D
B
B
D
B
B
B
A
NS
B
A
NS
B
B
NS
B
B
NS
B
B
C
B
NS
C
B
NS
C
C
NS
D
C
NS
D
C
C
B
NS
C
B
NS
C
C
NS
D
C
NS
D
C
C
B
E
C
B
NS
C
C
NS
D
C
NS
D
C
NS
B
NS
NS
B
NS
NS
C
NS
NS
C
NS
NS
C
SWSB12x8
D
D
D
NS
NS
NS
NS
NS
SWSB18x8
B
B
B
B
D
D
SWSB24x8
B
B
B
B
C
C
SWSB12x9
D
D
D
NS
NS
NS
SWSB18x9
C
C
C
C
NS
D
SWSB24x9
B
B
B
B
C
C
6
SWSB18x10
C
C
C
NS
NS
E
SWSB24x10
B
B
B
B
D
D
SWSB18x11
C
C
C
NS
NS
NS
SWSB24x11
C
C
C
C
D
D
SWSB18x12
D
D
D
NS
NS
NS
SWSB24x12
C
C
C
C
D
D
1. See page 6 for anchor details and additional information.
2. See catalog C-L-SWSB13 for installation information and SWSB properties.
3. NS = No Solution
4. See general notes in technical bulletin T-SWPDG10 for additional information.
D
C
NS
D
C
E
D
E
D
E
D
NS
C
NS
NS
C
NS
D
NS
NS
NS
NS
2.5
4
SWSB Standard Application
Wood Floor
System Installation
Page_4_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
Table 4: Supplement to T-SWPDG10, Page 29
Wall Selection and Anchorage Classification:
BALLOON-FRAMING APPLICATION for Wind
Equivalent
Anchorage Classification
WallWall Model
Bracing
Conc. Strength (psi)
Length (ft)
CMU
2,500 3,000 3,500
2.5
4
6
SWSB18x15
C
C
C
C
SWSB24x15
SWSB18x16
B
C
B
C
B
C
B
NS
SWSB24x16
SWSB18x17
SWSB24x17
SWSB18x18
SWSB24x18
SWSB18x19
SWSB24x19
SWSB18x20
SWSB24x20
B
C
B
C
B
C
C
D
C
B
C
B
C
B
C
C
D
C
B
C
B
C
B
C
C
D
C
B
NS
B
NS
B
NS
C
NS
C
SWSB18x15
D
D
D
NS
SWSB24x15
SWSB18x16
C
D
C
D
C
D
C
NS
SWSB24x16
SWSB18x17
SWSB24x17
SWSB18x18
SWSB24x18
SWSB24x19
SWSB24x20
C
D
D
NS
D
D
D
C
D
D
E
D
D
D
C
D
D
E
D
D
D
C
NS
D
NS
D
D
D
SWSB24x15
D
D
D
NS
SWSB24x16
SWSB24x17
SWSB24x18
SWSB24x19
SWSB24x20
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
NS
NS
NS
NS
NS
SWSB BalloonFraming Application
1. A 2x6, minimum, full-length stud is required to be field-installed on each side
for panels over 18' tall with 10d nails at 16" on center.
2. See page 6 for anchor details and additional information.
3. See catalog C-L-SWSB13 for installation information and SWSB properties.
4. NS = No Solution
5. See general notes in technical bulletin T-SWPDG10 for additional
information.
Wood Floor
System Installation
Page_5_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
Table 5: SWSB Anchorage Reference Chart
Model
Anchor
Width
Diam.
(in.)
(in.)
Post-Installed Anchor
T-SWPDG10 Page Number
Components
Foundation Type and Application³
No. of
Stemwall
Stemwall
Bearing
Slab
Brick Ledge
Round
(into wall)
(into footing)
Plate Size
Head Bolts Garage Others Garage Others Garage Others Garage & Others
SWSB12x_ 12⅛
7/8¹
⅜"x3½"x4¼"
1
pg. 47² pg. 50² pg. 54²
pg. 57²
pg. 61² pg. 64²
pg. 67²
SWSB18x_
18
7/8¹
⅜"x3½"x4¼"
2
pg. 47² pg. 50² pg. 54²
pg. 57²
pg. 61² pg. 64²
pg. 67²
SWSB24x_
24
1¹
⅜"x3½"x6½"
2
pg. 47
pg. 57
pg. 61
pg. 67
pg. 50
pg. 54
pg. 64
1. Threaded rod to be ASTM F1554 Grade 36 or ASTM A36 for applications addressed in this letter.
2. The T-SWPDG10 pages listed show 1" diameter anchor rods. SWSB12x_ and SWSB18x_ require ⅞" diameter anchor rods. T-SWPDG10 is to be used to
determine embedment depths, foundation requirements, and post-installed adhesive type; it is not to be used to determine anchor diameter or model number.
3. CMU foundations must use the Flat Anchor Reinforcement Template, Hex Head Bolts, and Concrete Bearing Plates shown in Figure 1 and follow the
anchorage provisions for Stemwall (into footing) foundations including the requirements on page 69 of T-SWPDG10 for Garage-Front applications.
Figure 1: SWSB Post-Installed and Cast-In-Place Anchorage
Page_6_of_6
Simpson˜Strong-Tie˜Company˜Inc.
L-L-SWSBWBRCE13
5956˜West˜Las˜Positas˜Boulevard
Pleasanton,˜CA,˜94588
Phone:˜925.560.9000
Fax:˜925.847.1605
www.strongtie.com
`