New fastener lengths simplify deeper soffit liner installation

New fastener lengths in EJOT’s DDS-Z range, exclusively available in the UK, are enabling much deeper levels of soffit insulation to be installed easily and efficiently thanks to the screw’s ability to anchor effectively into concrete with an embedment of just 25mm.

Existing DDS-Z fasteners in lengths including 275mm, 300mm, 325mm and 350mm are already proving popular with installers tasked with meeting higher thermal performance and fire resistance objectives in projects such as car parks, undercrofts and other ‘cold’ spaces, over which residential or commercial accommodation is built. One of the ways these stringent standards are being met is by using thicker soffit insulation, including non-combustible mineral fibre, which – in the case of the DDS-Z – already enables the installation of soffit depths up to 325mm.

The latest expansion of the EJOT DDS-Z range will enable similarly streamlined installation of further increased soffit depths to achieve even higher performance, with a fastener length of 400mm being launched by the end of the Q1 2026. This will accommodate an insulation thickness of 375mm.

Despite the extended fastener lengths, all versions only require a 25mm embedment into the concrete. This reduces the potential for impacting on reinforcement within the concrete, which could add time, complexity and cost to the project and, because the screw does not expand, it is more favourable for use with pre-stressed concrete beams.

DDS-Z brings together a premium quality concrete screw with the EJOT DD-T washer. As a fastener designed for the attachment of ceiling insulation and acoustic boards to concrete soffits, the DDS-Z is a steel screw featuring a duplex coating and self-tapping thread for use in cracked and non-cracked concrete. It also has a C1-C3 corrosion resistance classification.

EJOT UK’s Richard Bowhay, Sales Manager for Construction Fasteners, said: “The most recent updates to the building regulations and initiatives to meet Net Zero Carbon have led to increased scrutiny on how we insulate soffits. Fire safety and thermal performance are topping priorities, but acoustic performance has become critically important. Hence why thicker insulation is becoming a feature of many newbuild and refurbishment projects. But these performance drivers have to be balanced with more practical factors such as ease of installation and longevity, as well as aesthetics and – of course – the client’s budget.

“This is where the choice of fixings becomes critically important – they must be easy to use and provide a secure attachment throughout the lifespan of the soffit liner.”

To achieve the most effective and best value fixing methodology, EJOT can support installers and insulation suppliers to help them achieve performance goals.

www.ejot.co.uk/DDS-Z_extended_lengths