Can You Insulate Narrow Cavity Walls?

Question: Can You Insulate Narrow Cavity Walls?

For some years now, companies such as ours have been offering free retro-fitting of cavity wall insulation as part of a government effort to reduce the country’s carbon emissions. Normally this is done by drilling a few small holes into the walls of a house and blowing rockwool insulation into the cavity. This can be done if the cavity is wider than 50mm. But what if your walls have narrow cavities? Is there an alternative? What is the minimum depth that you can have cavity wall insulation?

Continue reading