Ok, being a cautious chap tell me about your cavity wall insulation woes or any problems encountered.
Just had a inspection and part of our house, 1st floor extension is already insulated with rock wool type insulation. This will not “tie” in with the Polypearl bead type this firm uses. They recomend, not insulating below this extension.
Any experience of this mix of insulation type, could this lead to a damp/condensation problem?