Wetherby Building Systems Ltd

New Timber EpsiTec


Wetherby Building Systems are proud to announce that we have gained BBA (British Board of Agrément) certification for External Wall Insulation onto Timber Framed buildings.

Wetherby’s Epsitec system for sheathed Timber Framed buildings is suitable for new and existing domestic or non-domestic buildings up to four storeys in height.

The certificate provides a range of insulation options to be used including; Wetherby’s Epsitherm (enhanced EPS), expanded polystyrene (EPS) and phenolic insulation. Epsitec rails are mechanically fixed to the sheathed substrate to create a cavity to protect the timber frame whilst ensuring the thermal benefits of the system are maintained. The reinforced basecoat and silicone render provides a flexible high impact finish, ideal for timber frame projects.

The key factors assessed to achieve the certification were thermal performance, strength and stability, behaviour in relation to fire and risk of condensation. The system also ensures durability, that the system will remain effective for at least 30 years.

Technical Manager , Joe Ragdale commented “This certificate helps to complete our range of systems, we now have BBA accreditation options on masonry, steel frame and timber frame substrates. This is a great option for new build housing and the system already holds NHBC approval.”

View our BBA Cert for WBS Timber Frame Epsitec External Wall Insulation System

To find out more, please get in touch: call 01942 717100 to speak to a member
of our expert team or e-mail us at


EWI Application Guide
Wetherby BBA Approvals