STRUCTURAL ELEMENTS 45
EJOT fl at roofi ng solution helps housing developer avoid weather-related delays
A
n EJOT fi xing combination, which is designed for rapid installation of fl at roof systems with tapered
insulation, has been instrumental in market- leading retirement property developer McCarthy & Stone meeting the strict completion deadline at one of its latest developments in Wiltshire. The scheme at Wichelstowe in Swindon is formed of two blocks which accommodate a range of one and two bedroom apartments designed to offer stylish independent living for the over 60s, with around 120 new properties in total. McCarthy & Stone has co-developed the site with Anchor Hanover Group (Anchor), England’s largest not-for- profi t provider of specialist housing and care for people in later life, to deliver a retirement community close to the picturesque Wilts and Berks Canal. The
developer’s fi rm commitment to
delivering the scheme to new residents on time, as promised, meant that the construction team had to pull out all the stops to fi nd creative solutions to keep the build schedule on track. One particular challenge resulted from the relatively small window available to install the extensive fl at roofs of the apartment blocks which fell at a time when temperatures had plummeted unexpectedly. The original proposal was for a tapered insulation system, incorporating a Bauder PVC membrane plus mineral wool insulation, to be bonded to the concrete deck. However, given the cold weather conditions, it was not possible to apply the adhesive during the planned installation window.
As waiting for the temperature to rise to the required level would have resulted in unpalatable delays to the construction programme, nationwide roofi ng contractor Protec Roofi ng was tasked with fi nding a solution that would ensure the proposed fl at roof system could still be used. Protec Roofi ng’s managing director Ian Green approached EJOT UK’s fl at roofi ng specialist Kevin Rackley for assistance. He had recently been introduced to EJOT’s mechanical fi xing solution for fl at roof systems involving a combination of the JBS-R fastener and EcoTek tube-washer at an industry event, and after recommending it to the project team, it was subsequently approved for use by Bauder.
The EJOT JBS-R/EcoTek combination brings together a high-performing organically coated concrete screw (JBS-R 7.5) with a high-quality telescopic tube-washer (EcoTek) to provide a fi xing solution that is adjustable to fi t the required depth of insulation. It is suitable
for all types of commonly used
tapered insulation, principally mineral fi bre, EPS, XPS and PIR.
The combination is suitable for any insulation depth of between 70 mm and 590 mm, and it has the benefi t of requiring fewer fastener/washer combinations than any other current mechanical fi xing approach. As a result, fastener use can be signifi cantly rationalised, subject to the application, a site survey and pull-out tests, which EJOT UK is able to assist with. At the Wichelstowe development,
the
tapered insulation depth on one of the roofs ranged from 90 mm to 330 mm, using four lengths of JBS-R fastener of between 80 mm and 210 mm. The roof on the second building involved insulation depths between 140 mm and 380 mm, which required three fastener lengths of between 120 mm and 210 mm. In addition to keeping the construction schedule on track during the cold weather, the installation process also proved popular with the team on site. Installation of the EcoTek/ JBS-R combination is easy because only one embedment depth is needed whatever the insulation thickness. Easy adjustability is also provided through the innovative way that the EcoTek tube-washer is driven into place using a custom tool with the fastener already in place.
Where the roof features a particularly deep layer of tapered insulation to maximise thermal performance, as was the case at Wichelstowe, EJOT’s fl anged A-cone and driver bit extension is used to avoid the awkwardness associated with drilling deep using standard SDS drills. This means installers can avoid a highly delicate procedure requiring long-length SDS drills, which are often diffi cult to source. The simplifi ed installation process offered EcoTek/JBS-R tube-washer
by the and
fastener combination also means that fewer on-site calculations were required compared to using other mechanical fi xing approaches. Long term performance is assured using the
when JBS-R/EcoTek
fastening
system given the quality materials used to manufacture both fastener elements. The JBS-R fastener is manufactured from case hardened steel and the EcoTek tube-washer is formed from high quality plastic to provide a lasting solution. The EcoTek/JBS-R combination is part of EJOT’s extensive range of fastening solutions for fl at roofi ng, encompassing fully mechanical and part-bonded systems, and fully compliant with the guidelines published by the Single Ply Roofi ng Association (SPRA). Flat roof designers, contractors and installers benefi t from highly specialised support from the EJOT UK team at all stages of the fl at roofi ng project to ensure all the performance objectives can be met without compromise.
01977 687040
www.ejot.co.uk/jbs-r_ecotek_combination
ADF JULY/AUGUST 2025
WWW.ARCHITECTSDATAFILE.CO.UK
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