Hi all, I am in the initial stages of planning my garage conversion, I will start a tread when the time comes, but for now I'm just trying get a few building issues clear in my own mind. I am not a builder, but feel happy I can do the job (well maybe not the plastering - this is the only unknown) with some pointers. Other than doing lots of drawings of proposed layouts, I'm currently laying a base for a shed (so we can clear all the "rubbish" out of the garage) and having the consumer unit moved to another wall as I don't want it in the "cinema room". As I've read in other posts an effective method of sound insulation is to build a stud wall (2"x4" timbers) 1" from the brickwall, fill with rockwool and cover with 2 layers (1 x 12mm and 1 x 16mm) plasterboard. 1) Should the rockwool be allowed to touch the brick wall? Should it touch the brick wall? If it shouldn't, how do I stop it? 2) I am leaving the up and over doors in place, but removing the runners etc. I will then screw them up, so they could not be opened even if you tried. I had then planned to cover the rear of the doors (to the framework with a plastic sheet) to prevent rain etc getting in. I then wanted to do a double thickness wall. Would I be best building a block wall inside the doors and then a stud wall inside that or shall I build two stud walls (the outer one somehow having a "back" to it) with a 1" gap between? Which will give the best thermal and accoustic insulation? If I go for the two stud wall method, should I use plasterboard on the wall inside the doors (the outer one) or should I use chipboard, OSB, plywood etc? 3) Vapour barriers - should I have one on the walls? If so where does it go? Does foil backed plasterboard do the same thing or is that for thermal insulation? If I use foil backed plasterboard, I'm assuming the foil side faces the rockwool? 4) Floor - This is a concrete floor and there is already a DPC. My plan is to put down some 2"x2" timers, fill with rockwool or 2" insulation slabs and then chipboard over the top. I will have to "pack up" (as I head towards the double doors) as there is a slight slope. Does this sound okay? If so, what thickness chipboard? 5) Downlighters in roof? Obviously I plan to inulate the roof and probably board the other side, however I've been reading that you need a segregated ceiling void or firehoods on downlighters? Is it not okay for the downlighters to touch the rockwool? Is this a fire hazard? I will probably have more questions, but if I get answers to these that will be a great start. Thanks in advance. Rob.