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Hi Adam. Where a wall has the possibility of being damp it would be best to leave an airspace of 25mm between the wall and then construct an independent timber frame. Assuming a 9” (215mm) solid wall then typically 75mm Celotex GA4000 between these studs would meet the required 0.3 U value...

Dear Ben, When insulating any element (wall, floor or roof) care must be taken not to increase the risks of harmful condensation. As the insulation performs it job and keeps the heat in your room, the masonry wall behind the insulation will have the potential to be much colder -...