Boise Cascade - Simpson Strong-Tie

TECHNICAL BULLETIN
ITBS: I-Joist Hanger - Skewed
For use with products
manufactured by:
Page 1 of 4
The ITBS solves the problem
of skew hangers in timber to
timber connections. It can be
handed left or right on site by
the carpenter, removing
confusion when the floor is
built opposite to the drawing.
The ITBS is also fully
adjustable from 5 o to 67.5 o
skew, reducing the need for
‘special’ skew hangers.
Finally, the ITBS is a Backer
Free hanger - removing the
need for Backer Blocks in
standard installation.
Overall, the revolutionary
ITBS reduces build cost,
confusion and speed of
installation and stock
holding.
FEATURES
• 45o skew, with site adjustable skew from 5 o to 67.5 o
• Non-handed hanger, can be left or right skewed - adjusted on site, removing any
handing confusion and reducing stock holding.
•
•
•
Eliminates the need for backer blocks when supported from an I-joist header.
Open top flange improves ease-of-installation.
Only one size of nail required: 3.75mm x 30mm square twist.
H
W
This bulletin is effective
until March 31st 2009
and reflects information
available as at March 1st
2009. This information
is updated periodically
and should not be relied
upon after February 31st
2011; contact Simpson for
current information and
limited warranty or visit
www.strongtie.co.uk.
Simpson Strong-Tie
United Kingdon Office
Winchester Road
Cardinal Point
Tamworth
Staffordshire
B78 3HG
FAX: 01827 255616
•
•
Can be used on I-joist or solid joist headers.
Optional nail holes for additional download.
01827 255 600
www.strongtie.co.uk
Material: 1.5mm thick Mild Steel to BS EN 101142 DX51D + Z275
Finish: Galvanised
© 2009
Simpson Strong Tie Inc.
T-UK-ITBS-BOISE 02/09
exp. 02/2011

TECHNICAL BULLETIN
ITBS: I-Joist Hanger - Skewed
HANGER SAFE WORKING LOADS
Page 2 of 4
Dimension (mm)
Fasteners
Safe Working Loads (kN)
ITBS
Model
No.
Height
Width
Installation
3.75mm x 30mm
Header Joist
Long
Term
Medium
Term
Long
Term
Uplift
Short
Term
Uplift
ITBS(H)/(W)
ITBS(H)/(W)
195 Min
301 Max
40 Min
91 Max
Standard I-joist
Header (10’s)
195 Min 40 Min Enhanced I-joist
301 Max 91 Max
Header (1000’s)
12 1 3.70 4.20 0.60 0.70
12 1 3.10 3.50 0.60 0.70
ITBS(H)/(W)
ITBS(H)/(W)
195 Min 40 Min Enhanced* I-joist
22 3 5.50 6.20 0.60 0.70
301 Max 91 Max
Header
195 Min 40 Min
LVL Header 22 1 6.50 7.45 0.60 0.70
301 Max 91 Max
• 3.75mm x 30mm refers to a galvanised square twist nail.
• Standard installation SWL’s refer to I-Joist without backer blocks.
• All bearing lengths are 63mm.
* Enhanced installation refers to I-Joist headers with backer blocks installed. Backer blocks are to be installed in
accordance with the manufacturers recommendations.
ITBS HANGERS FOR TIMBER I-JOISTS
Joist Type Joist Size ITBS Model No.
Dimension (mm)
Height
Width
Stock
Item
BCI5000 241 241/51 ITBS240/51 240 51 N
BCI5000 302 302/51 ITBS301/51 301 51 N
BCI6000 241 241/59 ITBS240/61 240 61 N
BCI6000 302 302/59 ITBS301/61 301 61 N
BCI60 241 241/59 ITBS240/61 240 61 N
BCI60 302 302/59 ITBS301/61 301 61 N
BCI90 241 241/89 ITBS240/91 240 91 N
BCI90 302 302/89 ITBS301/91 301 91 N
Note: The ITBS has 2 widths of Back Plate. The 50mm Back Plate is supplied with stirup seat widths
less than 52mm. The 100mm Back Plate is supplied for stirrup seat widths between 52-100mm.
01827 255 600
www.strongtie.co.uk
© 2009
Simpson Strong Tie Inc.
T-UK-ITBS-BOISE 02/09
exp. 02/2011

TECHNICAL BULLETIN
ITBS: I-Joist Hanger - Skewed
Standard Installation Details
Page 3 of 4
Stage 1
Install the back plate onto the
header in the required position.
Ensure backer blocks are fitted
if enhanced performance is
required.
Stage 2
Secure the back plate
(inside angle) with the
specified nails.
Stage 3
Adjust the angle of the
back plate (if different from
45) to suit the required angle.
Use either adjustable set
square or the guide tables
shown below:
Bend one time only.
B
A
B
50mm BACKPLATE
100mm BACKPLATE
Skew Angle
(A)
Distance
(mm) (B)
Skew Angle
(A)
Distance
(mm) B)
5 o 106 5 o 206
15 o 104 15 o 200
22.5 o 100 22.5 o 190
30 o 95 30 o 180
37.5 o 87 37.5 o 166
45 o 79 45 o 149
52.5 o 69 52.5 o 130
60 o 58 60 o 109
67.5 o 46 67.5 o 86
01827 255 600
01827 255 600
www.strongtie.co.uk
© 2009
Simpson Strong Tie Inc.
T-UK-ITBS-BOISE 02/09
exp. 02/2011

TECHNICAL BULLETIN
ITBS: I-Joist Hanger - Skewed
Standard Installation Details
Page 4 of 4
Stage 4
Secure the obtuse side of the
back plate onto the header
with all the specified nails,
ensuring the face of the back
plate is tight against the
header.
Stage 5
Offer the stirrup to the back plate
ensuring it is located on the
correct side (which can be either
left or right hand side). Once all
of the hooks (on the back plate)
are clearly through the apertures
(on stirrup) slide in a downward
direction ensuring all hooks
engage onto the stirrup and click
into position.
Stage 6
Locate the floor joist into the
stirrup ensuring the joist is set
tight to the back of the stirrup.
The joist should be secured into
the stirrup with all specified nails
on the open face of the stirrup.
(Note: For enhanced uplift install
web stiffeners onto carried
member as per manufacturers
recommendations.)
01827 255 600
www.strongtie.co.uk
Example of Enhanced
Installation
© 2009
Simpson Strong Tie Inc.
T-UK-ITBS-BOISE 02/09
exp. 02/2011