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EJOT fastening solutions support green roof vision in Bangkok

EJOT UK has been involved in a new and exciting project and provided innovative solutions to meet the complex design requirements of a 2,500 sq. m green roof for the Forest Pavilion, the centrepiece building of a new 158-acre wellbeing-focused development in the Thai capital, Bangkok.

The Project

‘The Forestias’ residential and commercial scheme seeks to ‘bring Bangkokians back to nature’ by providing a forested neighbourhood that blends state-of-the-art technology and construction with deep forest for sustainable well-being. The masterplan by Foster + Partners brings to life the vision of developer MQDC to create a multi-generational residential neighbourhood on the edge of Bangkok with a 6,000 sq. m nature reserve at its heart.

A key building within the development is the unique Forest Pavilion. According to Foster + Partners Thailand, this 5,500 sq. m ‘experience centre’ showcases the vision of the project’s concept through ‘immersive and interactive experiences designed to evoke The Forestias lifestyle’. In common with the Forestias ethos to bring together technology and nature, the Forest Pavilion features an extensive green roof as part of an eye-catching building envelope alongside aluminium shingles, aluminium standing seam and PV-panels.

The Products

To deliver on the architect’s 2,500 sq. m green roof vision, contractor D1 Systems partnered with EJOT UK to utilise its innovative lightweight fastening systems. The solution centred around a combination of the EJOT HTK tube-washer, for securing the roof insulation and PVC membrane to the metal deck substrate whilst minimising thermal transmission, and EJOT EJObar to anchor the soil’s wire reinforcement securely – all without adding significant weight.

Manufactured from high grade plastic, HTK tube-washers are a thermally superior alternative to-metal tube-washer/fastener combinations. They provide high load bearing strengths in a variety of lengths to facilitate secure mechanical fixings into steel, plywood or concrete substrates and their telescopic design resists impact loads.

One major challenge on the Forest Pavilion project was to achieve a secure attachment for the green roof at an angle of 16 degrees without exceeding a maximum weight of 35kg per sq. m. Any fastening system also had to be 100% waterproof to prevent corrosion risks and maximise the lifespan of the building as well as accommodating significant wind uplift given the position of the Forest Pavilion, initially stand-alone with no adjacent buildings to deflect the wind.

EJOT engineers provided extensive technical support to D1 Systems including calculations for the optimum number of fasteners to balance strength, weight and security. The EJOT team also assisted in a materials selection process for the green roof conducted by RISC (Research & Innovation for Sustainability Center) on behalf of the developer, which included providing detailed test reports and internationally recognised certification to demonstrate the integrity of the proposed fastening solution.

Ben Gallant, Export Sales Manager for EJOT UK said: “The Forest Pavilion was an exciting project to be part of and central to this unique sustainable development. An innovative approach to the fastening systems was crucial to deliver the complex roof design without adding weight, and with HTK and EJObar in our membrane systems portfolio we had an immediate advantage to enable D1 Systems to secure the contract.

“In particular, the 16-degree pitch combined with the weight of the green roof required soil reinforcement wire cable to be strategically placed across the roof section, created using Rhenofol CG PVC membrane. These cables needed a lightweight anchoring material capable of providing a secure mechanical fixing which was ideally suited to EJObar, a membrane-friendly product that is already widely used as a carrier system for M&E and solar PV installations.”

HTK and EJObar are part of a wide range of construction fastening solutions available from EJOT UK. As the Forest Pavilion collaboration demonstrates, the team works both in the UK and internationally to provide a wealth of technical support and specialist guidance to help specifiers and installers achieve the right result every time with all aspects of the building envelope.

The Forestias residential and commercial scheme. A multi-generational residential neighbourhood on the edge of Bangkok, which will have a large forest at the centre. The Forestias has been designed by Foster + Partners' to address a "growing disconnect between contemporary city life and family traditions" in the country.​​​​​​​


Forest Pavilion, the centrepiece of the The Forestias. ​​​​​​​​This 5,500 sq. m experience centre showcases the vision of the project’s concept through ‘immersive and interactive experiences designed to evoke The Forestias lifestyle’.

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The Forest Pavilion features a 2,500 sq. m green roof. This building is the centrepiece of a new 158-acre wellbeing-focused development. The Forestias ethos to bring together technology and nature. This is clearly visible in these pictures.

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Product Showcase: HTK Tubewasher


  • Combines with appropriate fastener to secure insulation to steel profiles and plywood deck
  • For use where the membrane layer will be mechanically fixed to the insulation surface
  • For new buildings and renovations
  • Available loose or pre-assembled​​​​​​​


  • High grade plastic material
  • Telescopic design for resistance to imposed loads
  • Meets SPRA guidelines for resistance to imposed loads
  • Limits cold bridging

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Product Showcase: EJObar


  • Professional and cost-effective flat roof bridging bar
  • Creates strong fixing base
  • No penetration of membrane required
  • Maintains watertight integrity of the roof
  • Suitable for most single-ply PVC membranes


  • Thermoplastic membrane profile based on monomeric PVC-P
  • 2.0 mm aluminium bar creates strong fixing base
  • Sealing caps are injection moulded for a precision fit
  • Use fixed or free-standing
  • Secure to EJObar using​​​​​​​ JF3 2 5.5 x 25 S16 fasteners

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​​​​​​Both of these showcased products plus a whole lot more are featured in the ​​​Intelligent fastening for membrane roofing systems brochure. So if you want to know more about the full EJOT range, request your copy here...

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