Timber frame cavity wall insulation is one of the most popular forms of new-build home building in the UK due to its pre-engineered quality and speed of construction. However, many of these homes were built using a masonry cavity wall with no insulation and the improvement of this insulation in these types of properties will require careful consideration, particularly where the frame is exposed externally.

A good solution is to use glass mineral wool insulation that can be inserted between the frames (Knauf Insulation’s FrameTherm Rolls or ISOVER Timber Frame Batts) and this will not only increase energy performance, but it will also improve acoustic performance as the timber frame walls are able to act as an effective sound barrier. This method also eliminates the need to change the cladding, which could be expensive and may compromise the aesthetic of the building.

Maximizing Efficiency: Timber Frame Cavity Wall Insulation

For older timber-framed properties, it is recommended that the insulated cavity is ventilated to ensure air and moisture can disperse. Insufficient ventilation can lead to condensation within the cavity which can cause rot in concealed areas of the timber frame structure. This problem is also a concern for steel framed buildings, as it can be difficult to get sufficient ventilation around the cladding and this can lead to corrosion problems.

Adding a breather membrane behind the weatherboards will reduce this risk and it is recommended that these are installed in timber frame structures to avoid the potential for damp penetration and subsequent rotting of the wood studs. Ideally, this should be fitted with some ‘slack’ so that the weatherboard is not held too tightly to the membrane.