HI there, i have a cavity wall pumped with silver bead. I had to open a few small location in the blockwork which has left small voids. Could i shoot expanding foam in here to fill it up or might that cause issues with damp?
Expanding foam will be no better or worse than what's in there (from a damp point of view), so squirt away!
thanks roger, thought bead might allow any water in the cavity to drain better, but as long expanding foam wouldn't soak any moisture up.