Insulating and rendering a timber-framed construction

Timber frame methods of building offer many benefits in the way of fast-track and off-site construction. However, although timber is treated, it's vulnerable to rot and needs to be kept in a warm, dry environment.

Common issues and queries you can face


Bad construction may lead to rot

Even treated timber needs to be kept in a dry environment. Poor detailing and bad construction may lead to water penetration of the facade, which if allowed to reach the timber frame, may result in rot and at worst, structural failure.


Interstitial condensation

Interstitial condensation may form within the structure when insulation is not placed in the correct position. Timber constructions often rely on a vapour barrier on the warm internal face.


No benefit by insulating outside the cavity

The NHBC recommend and require that a ventilated and drained cavity be installed between the cladding system and the timber frame. The ventilation helps control the moisture levels of the timber. As the cavity is ventilated, there is no benefit gained by insulating outside of the cavity.

Insulate and finish with weberend MT

Insulate the frame within the stud, provide a minimium 40 mm cavity (20 mm if backed by breather membrane or similar). Fix suitable sheathing board spaced off to create drained/ventilated cavity and finish with weberend MT.

  1. Insulate

    Fix insulation within the stud.

  2. Ventilate

    Provide suitable sheathing board spaced off the insulation/stud to maintain the drained and ventilated cavity.

  3. Finish

    Finish with weberend MT system with choice of finishes.

    Note: Due to space constraints, full specification details for panel based systems are not included in this guide. They are however, readily available from our technical team.

Contact us

If you have any questions or would like assistance, please contact our technical team:

Our technical team is available Monday to Friday, 8:30am until 5.00pm.

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