How to Build a Timber Frame Cavity Wall

Timber frame cavity wall is an alternative to masonry cavity wall construction in new-build dwellings. It offers timber frame builders a faster building process and superior insulation performance. However, if not properly constructed, it can result in damage to the timber frame structure and cladding. To reduce this risk, it is vital to understand how a timber frame cavity wall should be built. Read more

A drained and vented cavity space is required behind all types of cladding on timber framed walls. This enables moisture vapour to travel through the timber elements and escape the wall, preventing the formation of damaging interstitial condensation within lightweight clad timber walls. It is also important to ensure that timber elements are kept dry below the decay threshold.

It is essential to use high quality, third-party certified insulation materials in timber frame cavity wall construction. This helps to ensure compliance with regulations and performance standards.

Enhancing Comfort: External Timber Wall Insulation Methods

The primary layer of insulation in a timber frame cavity wall is usually PIR or glass mineral wool, fitted between the timber studs. This is then covered with an external breathable membrane. The permeability of the breather membrane is important, as it allows water vapor to escape from inside the building and help to maintain a healthy indoor environment.

The cavity should be 20mm deep, as research from New Zealand has found this to be the ideal size. It prevents sagging or bulging of the insulation and provides adequate ventilation. It is also crucial to ensure that the timber cladding is fixed securely to the timber lintels. Look for access points that will allow you to see into the cavity space. These could include meter cupboards, telecoms hatches or vents.

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