I am considering building a room between two others, essentially taking space to create a third room. I was thinking of using chipboard with gypsum on the outside. To prevent the walls from becoming too thick, I was considering using 2x2 studs; will this work if electrical wiring is to be included in the wall? If I were to use 2x4 studs, the wall would become so thick that I would probably opt out of using chipboard and go with single gypsum. What would you do?
Additionally, there's the issue of letting in light. The upstairs has a slanted ceiling with a 1.2m wall underneath, and my plan is to install two overhung, basement type windows under it instead of opening the roof. Roof windows are all well and good, but I'm not inclined to go for that because the roof insulation is chip. Any tips on this?
//Micke
Additionally, there's the issue of letting in light. The upstairs has a slanted ceiling with a 1.2m wall underneath, and my plan is to install two overhung, basement type windows under it instead of opening the roof. Roof windows are all well and good, but I'm not inclined to go for that because the roof insulation is chip. Any tips on this?
//Micke
use 45X70 plyfa+gypsum 45x45 will do as well but 45x70 is much better, then you can also get some insulation in the wall.
yes and the window is probably good too, might just make the walls a little "thick" but that probably doesn't matter
yes and the window is probably good too, might just make the walls a little "thick" but that probably doesn't matter
45x45 and OSB/plywood/chipboard + gypsum work fine. If you want to overdo it, you can screw-glue the wooden board to the studs. The glued-together construction will then be much stronger and stiffer than 45x70 + gypsum. But I would probably hardly screw-glue it... 
Electrical boxes are no problem with 45 studs, but two boxes cannot be in the same place on either side, though.
edit: Eljo's VP-2 boxes are a bit deeper than many others, like Ed-Wa, the dimension is chosen so that the box can be mounted by gluing it to the other side when framed with 45x45. But I don't know when Eljo thought that you would place boxes only on one side of the wall.
There are occasions, though, such as additional insulation, framing of uneven walls, etc...
Electrical boxes are no problem with 45 studs, but two boxes cannot be in the same place on either side, though.
edit: Eljo's VP-2 boxes are a bit deeper than many others, like Ed-Wa, the dimension is chosen so that the box can be mounted by gluing it to the other side when framed with 45x45. But I don't know when Eljo thought that you would place boxes only on one side of the wall.
There are occasions, though, such as additional insulation, framing of uneven walls, etc...
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Ok. When building with 45x45 and let's say chipboard and gypsum, it will be a total of 4 boards the sound has to penetrate, is insulation needed then? I'm thinking that the room will be between 2 that already exist. Alternatively, it will be 3 rooms "in a row" with children or it will be children, parents, and children. You want it to be as soundproof as possible between the rooms.
Insulation does very little for sound between rooms, actually. It mostly dampens sound that occurs within the cavity itself, like a bit less drum noise. For this effect, it doesn't need to be packed with insulation.
Your planned construction with chipboard+gypsum panels, however, dampens sound between rooms much better than just gypsum.
If you want good soundproofing, you should also:
1. Ensure all openings between the rooms, down to the smallest gap, are sealed. For example, apply some acrylic sealant everywhere there might be a narrow gap.
2. Insulate and seal between the frame and the door opening.
3. Avoid placing electrical boxes back-to-back.
4. Possibly place a rubber seal between the door and the frame.
5. Possibly choose a better door.
Your planned construction with chipboard+gypsum panels, however, dampens sound between rooms much better than just gypsum.
If you want good soundproofing, you should also:
1. Ensure all openings between the rooms, down to the smallest gap, are sealed. For example, apply some acrylic sealant everywhere there might be a narrow gap.
2. Insulate and seal between the frame and the door opening.
3. Avoid placing electrical boxes back-to-back.
4. Possibly place a rubber seal between the door and the frame.
5. Possibly choose a better door.