I'm going to be soundproofing an upstairs bedroom, involving soundproofing window (secondary glazing), floor, walls, ceiling and door frame, from a variety of sources including Soundproofing noisy neighbours with sound insulation. Soundproofing walls, acoustic insulation for ceilings & floors. Soundproof with Soundstop UK. , Soundproofing UK Sound Proofing acoustic insulation and noise insulation specialists and 1st Secondary Double Glazing. In order to do so, I need to first of all strip the room practically bare. I've lifted the carpet, the underlay, the carpet grippers and removed the skirting boards. I'm left with a room as follows:- Uploaded with ImageShack.us Uploaded with ImageShack.us Uploaded with ImageShack.us Uploaded with ImageShack.us Numbers in red used to identify walls:- Walls 1 and 4 are internal walls separating another bedroom (wall 1) and a bathroom (wall 4). Walls 2 and 3 are external walls - wall 2 has a pitched garage roof partly against it and wall 3 faces the garden with nothing either side of it. The following pictures show what was/is behind the skirting on each of the walls:- Uploaded with ImageShack.us Uploaded with ImageShack.us Uploaded with ImageShack.us My questions are as follows:- 1. Am I safe to assume that all 4 walls have been plasterboarded, and I can safely knock them all in to reveal (presumably) stud walls (walls 1 and 4) and the external skin of the house (walls 2 and 3)? 2. Is the skin of the house (behind the plasterboard on walls 2 and 3) breeze block? 3. Is there a different technique to knocking in a plasterboard wall that is studded behind compared with one which is sitting on breezeblock? 4. Why do the floorboards not meet the external skin of the house on walls 2 and 3 (see pictures below)? Uploaded with ImageShack.us Uploaded with ImageShack.us 5. Any tips on lifting the floorboards? 6. How do I remove the plasterboard around the window sill on wall 3 (see picture below)? Uploaded with ImageShack.us ++++++++ Apologies for the long first post, this is a major project for me and I don't want to start anything I'm not confident with.