Cullen Technical Guide 2024

/

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 24mm 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.

38

Technical support 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk

Made with FlippingBook Annual report maker