I have been asked to remove Hanging tiles from approx 30 square metres of cavity wall. Then a plasterer will apply render for the customer to paint. The initial request was to install Kingspan ThermoKool K5 40 mm with eml over the top to take the Render. However the labour cost of drilling the 250+ holes and plugging and anchoring the material has prompted a request to consider using No nonsense expanding foam (Screwfix) :shock: in the cavity wall instead. Would this work?
I am concerned re type of foam and damp precautions/issues.