Roofs
Rapid Build Masonry Joist Hanger RB–JHI
— Suitable for use with Open Web Joists, I–Joists and trusses — Non return hangers are suitable with no masonry above. Return only required for increased load capacity
In Situ
— No masonry is required above the hanger (unless stated for increased load capacity). — The masonry supporting the hanger must be cured for 3 days prior to loading the floor. — The RB–JHI/RB–JHIR does not provide restraint, therefore restraint straps may be required (see pages 81 – 82)
Load Data
Characteristic Capacity (kN)
Fixings (3.4 x 35mm)
Masonry Above (Min 675mm)
Hanger Type
Masonry Crushing Strength
Uplift
3.5N/mm 2
7.0N/mm 2
2.8N/mm 2
Incoming
RB–JHI
No
2
n/a
12.56
15.71
21.26
2
2.00 4.50
RB–JHI
Yes
19.83
24.79
39.60
5 (2)
Enhanced Uplift (2)
Hanger Depth (mm)
Min Timber Depth (mm)
— Fixings into the incoming joist/truss are required to resist uplift — Increased uplift figures can be achieved by nailing the additional triangular nail holes into incoming member — Web stiffeners required for I–Joists, 2No end blocks required for Open Web Joists & minimum bottom chord depth/vertical required for trusses — Requires minimum full storey of masonry above to achieve values
150
84
175 – 195 225 – 240
122 172 195 235 300 350
250 300 350 400
Incorrect Installation
MAX 6MM
NO GAP
MIN 250MM
MAX 3MM THICKNESS OF RB-TOP PLATE
Do not cut/modify the top flanges. These are critical to the performance.
Do not install the hanger with a gap exceeding 6mm between the joist/truss and the hanger.
Do not install the hanger with a gap between the hanger and the face of the block work.
Do not install the hanger onto a timber wall plate.
The latest most up to date version will always be online and not in print or in downloaded pdf.
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Technical support 01592 771132 / technical@itwcp.com / https://www.itwcoe.com
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