A timber frame cavity wall is a type of timber frame construction that utilises an insulation and ventilation space between the softwood timber studs. This construction method is most common in modern residential buildings. It provides a good balance between high thermal performance and a safe building environment. This link timberframeinsulation.co.uk
The main advantage of timber frame cavity walls is that they offer a first line of defence against moisture ingress – protecting the cladding and timber frame structure from wind-driven rain or water leaks through the cladding system. They also prevent the formation of harmful interstitial condensation that can occur within timber framed walls without adequate ventilation. This condensation can cause toxic mould, mildew and wood rot and must be prevented through the use of a properly designed and installed ventilation system.
Insulating Your Timber Frame House: Tips for Energy Efficiency
Cavity wall construction provides a safe and durable build with the added benefit of insulating the building to reduce energy costs. Its ability to trap air helps to eliminate cold spots and prevent conditioned heat from escaping in summer. This is achieved through a combination of the drained and vented cavity, together with a well-fitting, permeable external membrane.
A drained and vented cavity system is required behind all types of cladding to allow moisture vapour that travels through the timber frame and cladding to ventilate freely, preventing damaging condensation within the wall. It is vital that the cavity barrier selected is designed to suit the cladding system, insulation type and stud cavity size.