Draughts in your extension? Blame wind washing

Building Advice on preventing drafts across your home

it sounds like air is flowing into the internal space, and you are feeling the discomfort of a fluctuating internal atmosphere

Dear Brigid, 

We added an extension to our 1960s home nearly 20 years ago, and while loads of rigid insulation went in and membranes etc, it’s not nearly as warm or ‘airtight’ as we’d have thought.