REVIEWED RESUB1 BLD2023-1075+SIMPSON HOLDDOWNS ETC+10.18.2023_10.39.34_AM+3847447 4 2HDU/DTT RESU B
HOldowns Oct 18 2023
CITY OF EDMONDS
DEVELOPMENT SERVICES
@ERE DEPARTMENT
G This product is preferable to similar connectors because
��1 O
of (a) easier installation, (b) higher loads, (c) lower
installed cost, or a combination of these features.
HDU holdowns are pre -deflected during the manufacturing
process, virtually eliminating deflection under load due to pilot holes to[
material stretch. They use Strong -Drive® SIDS Heavy -Duty manufacturinc
purposes
Connector screws which install easily, reduce fastener slip and (fastener
provide a greater net section when compared to bolts. not required)
The DTT tension ties are designed for lighter -duty holdown
applications on single 2x posts. The DTT1Z is installed with
nails or Strong -Drive SD Connector screws and the DTT2
installs easily with the Strong -Drive SIDS Heavy -Duty Connector
screws (included). The DTT1Z holdowns have been tested for
use in designed shearwalls and prescriptive braced wall panels
as well as prescriptive wood -deck applications (see p. 295 for
deck applications).
For more information on holdown options, contact
Simpson Strong Tie.
HDU Features:
• Uses Strong -Drive SIDS Heavy -Duty Connector screws
which install easily, reduce fastener slip and provide a
greater net section area of the post compared to bolts
• Strong -Drive SIDS Heavy -Duty Connector screws are
supplied with the holdowns to ensure proper fasteners
are used
• No stud bolts to countersink at openings
Material: See table
Finish: HDU — galvanized; DTT1Z and DTT2Z — ZMAX®
coating; DTT2SS — stainless steel
Installation:
• See Holdown and Tension Tie General Notes on pp. 49-50.
• The HDU requires no additional washer; the DTT requires
a standard -cut washer (included) be installed between
the nut and the seat.
• Strong -Drive SIDS Heavy -Duty Connector screws install best
with a low -speed high -torque drill with a W hex -head driver.
• Fasteners and crescent washer are included with the
holdowns. For replacements, order part no. SDS25212-HDU_.
(Fill in the size needed, e.g., HDU2.)
Codes: See p. 11 for Code Reference Key Chart
BLD2023-1075
V nvv
Minimum
wood
® member
thickness
® (see General
® Notes)
® ® preservative-
® treated barrier
may be
required
Vertical HDU
Installation
REVIEWED
BY
CITY OF EDMONDS
DTT2Z
US Patent
8,555,580
0
0
DTT1 Z
US Patent
10,865,558
Hanger
not shown
0
Horizontal HDU Offset Installation
(plan view)
See Holdown and Tension Tie General Notes.
52
HDU/DTT
Holdowns (cont.)
- These products are available with additional corrosion ® For stainless -steel Many of these products are approved for installation
protection. For more information, see p.14. fasteners, see p. 21. with Strong -Drive® SD Connector screws.
See pp. 348-352 for more information.
Model
No.
Ga.
Dimensions
(in.)
Fasteners
(in.)
Minimum
Wood
Member
Size
(in.)
Allowable Tension Loads
(160)
Code
Ref.
W
H
B
CL
SO
Anchor
Bolt Dia.
(in.)
Wood
Fasteners
DF/SP
SPF/HF
Deflection at
Allowable Load
(in.)
DTT1Z
14
11/2
7'/s
1716
3/a
�Y16
3/s
(6) #9 x 1'/2" SD
1'/2 x 31/2
840
840
0.17
(6) 0.148 x 1'/2
910
640
0.167
(8) 0.148 x 1'/2
910
850
0.167
DTT2Z
14
3'/a
6'1/1s
1 %
9/1s
3/s
'/z
(8)'/a x 1'/z SDS
1'/z x 31/2
1,825 11
1,800
0.105
(8)'/a x 1'/z SDS
3 x 3'/z
2,145
1,835
0.128
T
' '
HDU2-SDS2.5
14
3
811/16
31/4
1 1/1s
13/s
%
(6)'/a x 2'/2 S D S
3 x 31/2
3,075
2,215
0.088
3
IBC,
s
a
s
e
/s
a x' z
x z
4,
1
FL, LA
HDU5-SDS2.5
14
3
133/i6
3'/a
1 s/is
13/e
s/s
(14)'/a x 2'/2 S D S
3 x 3'/z
5,645
4,340
0.115
HDU8-SDS2.5
10
3
16%
3'/z
1 %
11/2
7/s
(20)'/a x 2'/2 S D S
3 x 3'/z
6,765
5,820
0.11
3'/2 x 31/2
6,970
5,995
0.116
3'/2 x 41/2
7,870
6,580
0.113
HDU11-SDS2.5
10
3
22Ya
31/2
1 %
1 Y2
1
(30)1/4 x 2'/2 S D S
3'/2 x 51/2
9,535
8,030
0.137
3'/2x7'/4
11,175
9,610
0.137
HDU14-SDS2.5
7
3
25'yis
3'/z
19/is
19/is
1
(36)'/a x 2'/2 SIDS
3'/2 x 51/2
10,770
9,260
0.122
—
3'/2 x 7'/a
14,390
12,375
0.177
IBC,
FL, LA
5'/2 x 51/2
14,445
12,425
0.172
1. HDU14 requires heavy -hex anchor nut to achieve tabulated loads (supplied with holdown).
2. HDU14 loads on 46 post are applicable to installation on either the narrow or the wide face of the post.
3. Fasteners: Nail dimensions are listed diameter by length. SD and SIDS screws are Simpson Strong -Tie® Strong -Drive SD Connector
and SIDS Heavy -Duty Connector screws. See pp. 21-22 for fastener information.
Typical DTT2Z Installation
Typical HDU Tie Between Floors
53
UPDATED 07/01/22
L/LS/GA
290
Reinforcing and Skewable Angles
L — Staggered nail pattern reduces the possibility for splitting
LS — Field -adjustable 0° to 135° angles.
GA — Gusset angles' embossed bend section provides
added strength.
Material: L — 16 gauge; GA and LS — 18 gauge
Finish: Galvanized. Some products available in stainless steel
or ZMAX® coating. See Corrosion Information, pp.12-15.
Installation:
• Use all specified fasteners; see General Notes
• LS — Field skewable; bend one time only
• Joist must be constrained against rotation (for example,
with solid blocking) when using a single LS per connection
• Nail the L angle's wider leg into the joist to ensure
table loads and allow correct nailing
Codes: See p.11 for Code Reference Key Chart
See
nstal'^'^^
no
Typical LS30 Installation
L
Typical L50 Installation
23/a" 13/8 n
L90 0 °
L50
°
L3�
m
°
L90
- These products are available with additional corrosion ® For stainless -steel
protection. For more information, see p. 14. fasteners, see p. 21
LS30 O ��
LS50 O I
LS70 O
-----� ��
90
LS
Adjustable
from 0° to 135°.
Bend one time only.
Shipped
at 45°
\�
LS Top View
1
Typical GA Installation
<"ttyD
0 0
L
u
GA1
Typical LS70 Installation
ImMany of these products are approved for installation
with Strong -Drive® SD Connector screws.
See pp. 348-352 for more information.
Model
No.
Fasteners
(in.)
L
(in.)
Load
Direction
DF/SP Allowable Loads
SPF/HF Allowable Loads
Code
Ref.
Floor
(100)
Snow
(115)
Roof
(125)
Wind/
Seismic
(160)
Floor
(100)
Snow
(115)
Roof
(125)
Wind/
Seismic
(160)
GA1
(4) 0.148 x 11/2
23/4
F1, F2
235
270
290
350
200
230
250
300
IBC, FL, LA
(4) #9 x 11/2" SD
F1
340
375
375
375
225
260
280
325
IBC, LA
(4) #9 x 11/2" SD
F2
340
395
430
435
225
260
280
360
GA2
(6) 0.148 x 11/2
31/4
F1, F2
355
405
435
550
305
350
375
475
IBC, FL, LA
(6) #9 x 11/z" SD
F1
515
590
640
695
335
385
420
540
IBC, LA
L30
(4) 0.148 x 11/2
3
F1
245
250
250
250
210
215
215
215
F2
245
275
295
370
210
235
255
320
L50
(6) 0.148 x 11/z
5
1
F2
365
415
445
555
315
355
385
475
L70
(8) 0.148 x 11/2
7
F1, F2
485
550
595
740
415
475
510
635
L90
(10) 0.148 x 11/z
9
F1, F2
610
690
740
925
525
595
635
795
LS30
(6) 0.148 x 11/2
3%
F1
320
320
320
320
275
275
275
275
IBC,
FL, LA
(6) 0.148 x 3
F1
355
395
395
395
305
340
340
340
LS50
(8) 0.148 x 11/z
7 $
F1
475
540
560
560
410
465
480
480
(8) 0.148 x 3
F1
475
540
580
730
410
465
500
630
LS70
(10) 0.148 x 11/2
6 /$
F1 F1
590
645
645
645
510
555
555
555
(10) 0.148 x 3
F1
590
675
725
915
510
580
625
785
LS90
(12) 0.148 x 11/z
77/8
F1
710
805
870
890
610
690
750
765
(12) 0.148 x 3
F1
710
805
870
1,040
610
690
750
895
1. GA angles may be installed with 0.148" x 3" nails.
2. GA1 uplift is 425 lb. for DF and 300 lb. for SPF when installed with Strong -Tie® SD Connector screws.
3. GA2 uplift is 370 lb. for DF and 260 lb. for SPF when installed with Strong -Tie® SD Connector screws.
4. Connectors are required on both sides to achieve F2 loads in both directions.
5. Fasteners: Nail dimensions are listed diameter by length. SD screws are Simpson Strong -Tie® Strong -Drive SD Connector screws.
See pp. 21-22 for fastener information.
UPDATED 07/01/22