Roof Insulation

Hi all,

Just had my blow in insulation removed. Getting a sparky to inspect before installing R4 Earthwool batts installed.

Anyone know what this white stuff is? There’s a load of white paint and fibrous material.

I’m also considering some sound insulation/proofing - has anyone done this in their ceiling and does it make much difference or would regular earthwool help a fair bit regardless. We get a fair bit of noise between the bedroom and adjacent toilet other side of the wall in particular so considering our options.

Many thanks