Installation Notes - USP Connectors

Scissor Truss Clips – STC series
© Copyright 2013 USP Structural Connectors ®
The STC provides uplift resistance by securing trusses to top plates.
Slotted nail holes allow for horizontal movement as scissor trusses
deflect.
Materials: 12 gauge
Finish: G90 galvanizing
Codes: Load values are derived from data submitted to
various North American building code evaluators.
Fastener Schedule 2,3 Dimensions (in)
Factored Resistance (115%) 1
USP
Steel
Truss
Plate DF-L (Lbs) DF-L (kN) S-P-F (Lbs) S-P-F (kN)
Stock No. Ref. No. Gauge Description W1 W2 Qty Type Qty Type F1 Uplift F1 Uplift F1 Uplift F1 Uplift
STC24 TC24 12 2 x 4 top plate 3-9/16 1-5/8 5 10d x 1-1/2 6 10d x 1-1/2 550 1525 2.45 6.78 390 1085 1.73 4.83
STC26 TC26 12 2 x 6 top plate 5-1/2 1-5/8 5 10d x 1-1/2 6 10d x 1-1/2 550 1525 2.45 6.78 390 1085 1.73 4.83
STC28 TC28 12 2 x 8 top plate 7-1/4 1-5/8 5 10d x 1-1/2 6 10d x 1-1/2 550 1525 2.45 6.78 390 1085 1.73 4.83
1) Factored resistances have been increased 15% for short-term loads such as wind and earthquake; reduce for other load durations in accordance with the code.
2) Minimum nail embedment shall be 8 nail diameters (typ).
3) NAILS:
FLOOR TRUSS CLIPS – FTC SERIES
The FTC slides easily onto the top or bottom chord and provides a guide to
help position and support the second truss during assembly.
Materials:
Finish:
Codes:
18 gauge
G90 galvanizing
Factored resistances are derived from data submitted
to various North American building code evaluators
and are in accordance with CSA O86-09.
Installation:
• Use all specified fasteners. See Product Notes, page 10.
• The truss designer must determine the number of clips required
and the spacing between clips based on loading conditions.
Concentrated Load condition (side-loaded onto a 2-ply truss):
• The FTC clips shall be installed in pairs, or multiples of two, on
either side of, and within 12" of a concentrated load.
4 3 /8˝
• Divide half of the concentrated load by the clip capacity to
determine the number of clips required.
Example:
Concentrated load = 3000 lbs. FTC1 capacity (DF-L) = 1245 lbs
1
⁄2 (3000 lbs)
= 1.2 = 2 clips
1245 lbs
Install two FTC1 clips, one on each side of, and within 12" of the
concentrated load.
Uniform Load condition (side-loaded onto a 2-ply truss):
• To transfer uniform loads to the second ply, the FTC clips shall be
installed at a regular interval along the loaded chord. Spacing
between clips is limited to 24" maximum.
• Divide the clip capacity by half of the required load per lineal foot
(PLF) to determine the spacing between clips.
Example:
Uniformly distributed load = 500 PLF. FTC1 capacity (DF-L) = 1245 lbs
1245 lbs
1
= 4.98' spacing
⁄2 (500 PLF)
Space clips at 24" (MAX) along the loaded chord.
4 3 /8˝
W 1
H
2˝ 1 1 /8˝
FTC
6 1 /16˝
W 2
3 1 /16˝
2 1 /16˝
F 1
Typical STC
installation
Installation:
• Use all specified fasteners.
See Product Notes, page 10.
• When installing, do not fully set
nails.
• Locate nails into the center of
slots to allow for horizontal
movement.
Step 1 Step 2
Typical FTC2F retrofit installation
Dimensions (in) Fastener Schedule 2,4 Factored Maximum Transfer Resistance 1,3
Truss USP
Steel
DF-L (Lbs) DF-L (kN) S-P-F (Lbs) S-P-F (kN)
7 5/8˝
Size Stock No. Ref. No. Gauge W1 W2 H Qty Type 100% 100% 100% 100%
4
3 x 2 FTC32 -- -- 18 2-1/2 2-1/16 1-1/2 10 10d x 1-1/2 980 4.36 850 3.78
3/8˝
FTC1 -- -- 18 3-1/2 3-1/16 1-1/2 10 10d x 1-1/2 1245 5.54 1080 4.80
4 x 2
2 1/16˝
FTC1F -- -- 18 3-1/16 -- -- 4-3/8 10 10d x 1-1/2 1245 5.54 1080 4.80
FTC2 -- -- 18 3-1/2 3-1/16 3 10 10d 1245 5.54 1080 4.80
(2) 4 x 2
FTC2F -- -- 18 3-1/16 -- -- 4-3/8 10 10d 1245 5.54 1080 4.80
3 1/16˝
1) Factored transfer resistances are for 100% floor load, and shall not be increased for short term load duration.
2) Minimum nail embedment shall be 8 nail diameters (typ).
FTC2F
3) Truss designer shall determine the number of clips for concentrated loads and the spacing for uniform loads.
4) NAILS:
New products or updated product information are designated in red font.
1-800-328-5934 • www.USPconnectors.com 177
USP2240-131
W 2
W 1
1 1/4˝ slots
STC
FTC1F
Typical FTC
installation
Typical FTC
2 ply metal web
truss installation
Plated Truss