Removing uncertainty from external envelope specification

From sound and thermal insulation, to mechanical and fire resistance, we understand the challenges faced by specifiers when designing the external envelope of a building. With such wide-ranging performance requirements, it’s a complex challenge, and one to which, until now, no single supplier could offer a tested solution.

Thruwall® benefits

  • Fully tested systems
  • 30-year warranty
  • Market-leading products
  • Single supplier
  • Global provider
  • In-house technical support

Specify Thruwall® for:

  • Mixed-residential
  • Student Accomodation
  • Hotels

Three leading brands one certified solution

Thruwall® is a non-loadbearing in-fill system for the external building envelope,
comprising of:

  • Steel frame systems (SFS)
  • Weather Defence™ Eternal sheathing board
  • Internal drylining


  • E160 External wall system
  • 1 x 12.5mm Siniat Weather Defence™ (External)
  • 2 x 12.5 mm Siniat dB Board (Internal)
  • EOS light steel in-fill framing
  • GTEC I-Stud lining



  • E190 External wall system
  • 1 x 12.5mm Siniat Weather Defence™ (External)
  • 1 x 15mm Siniat dB Board (Internal)
  • 1 x 15mm Siniat Fire Board (Internal faing)
  • EOS light steel in-fill framing



  • E160 External wall system
  • 1 x 12.5mm Siniat Weather Defence™ (External)
  • 1 x 15 mm Siniat Fire Board (Internal)
  • EOS light steel in-fill framing


Product in Thruwall®

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Weather Defence™ sheathing board

Weather Defence™ is a market-leading, gypsum-based external sheathing board. Faced with water repellent material for superior weather protection, it’s strong, highly moisture resistant and A1 non-combustible. It’s also 50% quicker to install than cement particle board, and can be left exposed on frame for up to 12 months.

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Siniat Weather Defence installation
internal drywall

A comprehensive internal drywall range

Siniat is one of the UK’s leading manufacturers of drywall products and systems for partitions, ceilings, wall linings and external sheathing. Our extensive plasterboard range means we have solutions to meet even the most challenging building requirements, including acoustic, fire, thermal, moisture and impact resistance.

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Fully engineered
steel frame solutions

The EOS fully engineered in-fill frame solution can be applied to any primary structural frame. It’s custom-designed to meet the specific requirements of any given project. No matter the project’s size or scale, EOS Façades provides a versatile solution that’s manufactured to the most demanding specification.

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Steel frame system

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Case Study

The Crescent, Plymouth

Creation of a line loaded wall lining solution for modular student accommodation for Elements Europe…

Read more…

© Etex Building Performance Limited.

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