On 10/05/2019 19:26, ss wrote:
Stripping out the bathroom, having removed the plywood to be replaced
with moisture resistant plasterboard, I find this red / white material
behind it.
Is this for noise insulation?Â* The wall the other side is a bedroom.

https://imgur.com/N20kRSq

Before you do: consider Marmox or similar instead of plasterboard.

100% waterproof, vapour barrier and adds some thermal insulation too.

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