Cullen Hi-Vis Gripper Technical Guide 2025

Brands for the offsite industry

Hi-Vis Gripper Technical Guide Innovation. Quality. Service.

HV–GR Hi–Vis Gripper

Features & Benefits

The Hi–Vis Gripper is a build–in detail for I–joists into masonry reducing air leakage at the joist end. The Hi–Vis Gripper can be used on both external and party walls.

Patent Number GB2511155

Easily identifiable for post installation inspection

Build–in Detail Advantages (Requiring external mortar sealing only) — In line with existing building practice — Easy access — Quick and effective — Visual quality check from outside

Meets relevant requirements and certification - NHBC, BBA, UKCA & CE

HV–GR–1 38 – 53MM WIDE

Force fit installation (no nails or mastic sealant required , or need to trim joists to fit)

Fire tested up to 60 mins In compliance with approved document B

Approvals — Meets NHBC technical requirements — Part E: Compliant with the requirements of Appendix A of the Robust Details Part E Handbook — Assessed to BS ISO–TR12470:1998 for 60 minute fire requirements

Meets the sound requirements of a proprietary joist cap as specified by Appendix A, Robust Details Part E Handbook

Compliance Part L air tightness requirements - 68% more efficient than NHBC end seal detail requirements

Material Specification High density Polyethylene

HV–GR–2 58 – 72MM WIDE

Additional parallel and perpendicular restraint may be required. Please refer to the Cullen Technical Guide for further guidance on built in restraint.

1.02 m3/h

(+209%)

0.33 m3/h

HV–GR–3 89 – 97MM WIDE

New Cullen Hi-Vis Gripper

NHBC detail with mastic (minimum requirement)

Available Sizes

Joist Width (mm)

Flange Depth (mm)

Joist Depth (mm)

Joist Manufacturer

38 – 53

58 – 72

89 – 97

220 245 300 220 240 300 220 240 300 220 240 300

HV–GR–220–1 HV–GR–240–1 HV–GR–300–1

HV–GR–220–2 HV–GR–240–2 HV–GR–300–2

HV–GR–220–3 HV–GR–240–3 HV–GR–300–3

James Jones (JJI)

HV–GR–240–1 (36mm) HV-GR-240-1 (36mm) HV–GR–300–1 (36mm)

HV–GR–240–2 (36mm) HV-GR-240-2 (36mm) HV–GR–300–2 (36mm)

HV–GR–220–3 (39mm) HV–GR–240–3 (39mm) HV–GR–300–3 (39mm)

Metsawood (FJI)

36 & 39

To find out more about the features and benefits please scan the QR code to our new HV-GR features and benefits video Features & Benefits Video

HV–GR–220–1 HV–GR–240–1 HV–GR–300–1 HV–GR–220–1 HV–GR–240–1 HV–GR–300–1

HV–GR–220–2 HV–GR–240–2 HV–GR–300–2 HV–GR–220–2 HV–GR–240–2 HV–GR–300–2

HV–GR–220–3 HV–GR–240–3 HV–GR–300–3 HV–GR–220–3 HV–GR–240–3 HV–GR–300–3

Steico (SJI)

Masonite (H, HB, HI, HL, HM)

The latest version of the technical guide will always be the digital format on our website.

Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 3

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

Installation Instructions

Fold the HV-GR to create a spine and a gap between the two halves

HV-GR has been installed onto the joist and is ready for the mortar and blockwork to be added to finish the installation

Single joist Installation Video

Double joist Installation Video

Triple joist Installation Video

Slide the HV-GR on at an angle and apply some pressure to bend the bottom tabs

From here push evenly on HV-GR to slide it onto the joist

Scan the QR code to see our new single joist HV-GR installation video

Scan the QR code to see our new double joist HV-GR installation video

Scan the QR code to see our new triple joist HV-GR installation video

The latest version of the technical guide will always be the digital format on our website.

Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 5

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

Improved Site Practice

90mm Min.

Suitable for joist with either 90 or 100mm bearing. Approved Document A Structure states – Tension straps need not be provided: A. in the longitudinal direction of joists in houses of not more than 2 storeys, if joists are not more than 1.2m centres and have at least 90mm bearing on the supported walls”

Double / Triple joist application When installing double joist impossible to mortar fill between the joists creating an air passage, where the HI-VIS Gripper air tightness achieved by mortar to cavity face.

90mm Min.

The latest version of the technical guide will always be the digital format on our website.

Technical support: 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk 7

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

Brands for the offsite industry

Cullen Technical Support email: technical@itwcp.com

January 2025*

*Subject to change at discretion of ITW Construction Products Offsite

Cullen Technical Guide

ITW Construction Products 1 Wheatstone Place Southfield Industrial Estate Glenrothes Fife KY6 2SW t +44(0) 1592 771 132 f +44(0) 1592 771 182 e orders@itwcp.com www.itwcp-offsite.co.uk

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