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Timber Frame Wall Ties
Differential Movement in Timber Frame
New Requirements (Build Type)
Vertical Movement Allowed (mm)
Solution
2 storey
20
FT
Solid timber joists
3 storey and above
35+
HMT
2 storey 3 storey
15 25
FT FT
EWP joists
4 storey and above
35 – 60
HMT
FT
HMT
Cullen standard wall ties FT–50, 75 &100 accommodate maximum differential movement of 25mm and therefore can be used up to eaves level on a 2 storey for solid timber joists and up to 3 storey for EWP joist floors. For 3 storey solid timber joists and 4 storey EWP joists you will now require the Cullen High Movement Tie (HMT).
TO 7 STOREY
4 STOREY
4 STOREY
3 STOREY
3 STOREY
2 STOREY
2 STOREY
SINGLE STOREY
SINGLE STOREY
INTERMEDIATE FLOORS CONSTRUCTED USING SOLID TIMBER JOISTS
INTERMEDIATE FLOORS CONSTRUCTED USING EWP JOISTS
The above information is for guidance only, it states the maximum allowed movement of the Cullen timber frame wall tie range. For specific tie fixings please refer to the Building Engineer and/or section 6.2 of NHBC standards.
Gap sizes Closing Gap (CG) at window sills level and Opening (OG) at windows head levels Joist Material Solid Timber (mm) Engineered I–Joist (mm)
Gap Location
W
Bottom level (single storey)
A B C D E F G
5
5
Level 1 (2 storey) Level 2 (3 storey) Level 1 (4 storey) Level 4 (5 storey) Level 5 (6 storey) Level 6 (7 storey)
20 35 45
15 25 35 45 53 61
Specialist calculation to be submitted to NHBC
Eaves / verge
Add 5mm to level below
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.itwcp-offsite.co.uk
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