what in your opinion is the best and most cost effective product and pros and cons and any user tips
Frank spencer springs to mindDoing a garage conversion earlier in the year, foamed a patch on and was holding it with the left hand while I drove a couple of temporary screws in with the right to hold it and slipped and smashed the screwdriver bit straight into my thumb nail.
Screwed some loose boards on a ceiling and taped then skimmed it. Think when I screwed boards it never pulled them tight to joist so it cracked again. To fix. I have drilled 10mm holes and blasted some low expansion foam in. Waited an hour then skimmed ceiling. Cracks never came back.. I also think you can fix sound block board to walls with foam. Just wedge around and stick on. Pull wedges then fill all around the edges with more foam. Floating wall it's called I think. Just thought I would mention all this.. Here is me after the last job I did with foama builder that had done his own boarding had a few rattlers, he drilled the board placed the expanding foam behind the board it did stop the rattle.