I need to sound proof my bedroom ceiling from a noisey flat above, the ceiling is about 16 metres sq. I live in a Victorian conversion flat. The ceiling just has plasterboard over the joists and no insulation. I am intending to screw up a new layer of 12.5mm thick sounbloc plasterboard over the existing ceiling to block out noise. I didn't want to lower my ceiling so I wanted to avoid leaving a small gap between the two layers.
But I have heard that insulation is key to blocking out noise. I wondered if it would be a good idea before I put up my new soundbloc board, to drill small holes in the existing ceiling and spray with expanding foam to fill the void above. I saw that Wickes sell expanding foam in 300ml size cans. It states it has sound proof qualities. Is this a good idea? Will this help block out sound? Is this safe? How much coverage would I get wth a can?
Any advice would be great.