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What should you use to build the walls of your extension?
The main options would usually be masonry cavity construction or timber frame construction.
At Back to Earth we’d recommend using timber frame as we find it the most economical, practical and sustainable way to build and allows much more space efficient construction than masonry. You simply need to choose whether you’d prefer and rendered exterior or a timber/metal clad exterior. To see what we’d suggest click the relevant link below:-
However, if for some reason you need to use masonry then we’d suggest fully filling the cavity with mineral or glass wool to maintain the best levels of insulation. Rigid boards such as PIR do not tend perform well in a masonry cavity and often do not achieve the standard they are designed to achieve, so we would not recommend them.
We offer dynamic heat and moisture modelling as well as condensation risk analyses.
Back to Earth is a natural building material supplier. We're not your typical builders' merchant though and instead work closely with our clients during the planning, designing and building phases of projects.