I have an isolated storage room that I plan to heat, it's currently a cold storage. The inspector (I recently moved in) said that one must have plastic in the walls and ceiling if a storage space is to be heated, supplemented with vents.
The wall currently consists of (from outside to inside) vertical siding, wall paper (type), insulation, and 13 mm board on the innermost side. The same applies to the ceiling (flat with roof felt). I see two options:
1) Unscrew the board, place plastic, screw the board back
2) Place plastic directly on the board. Then screw on another layer of boards, such as MDF or plywood.
Option 2) would be simpler, but is there any disadvantage to having the plastic between wall boards instead of between the board and insulation (option 1)?
The wall currently consists of (from outside to inside) vertical siding, wall paper (type), insulation, and 13 mm board on the innermost side. The same applies to the ceiling (flat with roof felt). I see two options:
1) Unscrew the board, place plastic, screw the board back
2) Place plastic directly on the board. Then screw on another layer of boards, such as MDF or plywood.
Option 2) would be simpler, but is there any disadvantage to having the plastic between wall boards instead of between the board and insulation (option 1)?
Plastic is used to prevent moisture from migrating into the insulation. If you're using it as storage, no moisture will form, so perhaps have another chat with the inspector? Then you might not have to do anything about it?
No. Heating air does not add moisture. So outdoor air that is heated and then cooled back to outdoor temperature does not cause condensation. Moisture is added to indoor air by breathing, sweating, showering, washing & cooking. Since such activities usually don't occur in a storage room (heated or not), no moisture is added to the air that can condense on walls and ceilings. (The small amount of moisture a person exhales while doing something in the storage room is negligible.) The only thing that might justify using plastic would be if indoor air from the house can pass through the storage room and exit through a vent.
OK, then maybe it is enough to open a couple of vents (one in, one out) to get some circulation. It doesn't really feel like I want to seal it up just for fun...
By the way, I forgot to mention that it should be a combined storage and hobby room. So I will probably be there fixing and tinkering a bit, but likely not more than an hour or a couple of hours a day. Is it still not justified to seal it up?
By the way, I forgot to mention that it should be a combined storage and hobby room. So I will probably be there fixing and tinkering a bit, but likely not more than an hour or a couple of hours a day. Is it still not justified to seal it up?
Upon further reflection, it will likely be mostly a hobby room, with storage in the areas that are "leftover." (I also have a completely unheated garage where things can be stored - besides the car)
So the question is really: -Should the walls in a hobby room be plastic-wrapped? Or is good ventilation enough?
For your information, the exterior walls and roof of the entire house (the main building, that is) are wrapped in plastic, but that's living space in a different way from a hobby room.
So the question is really: -Should the walls in a hobby room be plastic-wrapped? Or is good ventilation enough?
For your information, the exterior walls and roof of the entire house (the main building, that is) are wrapped in plastic, but that's living space in a different way from a hobby room.
If your hobby won't be your full-time occupation, you shouldn't need plastic if you have sufficient ventilation. But it depends a lot on what you plan to do. If your hobby is cycling training, the need for ventilation and plastic in the walls will be different than if you want to do fine woodworking or collect stamps.
The size of the storage space also plays a role.
The size of the storage space also plays a role.
There was someone here on byggahus who used several pages to argue against plastic in houses. One of the arguments was that gypsum and chipboard are "so" dense. In a room with a little moisture load, it is possible that this density is enough... otherwise, the important thing is that the warm side is 20 times denser than the cold side, in your case, it should be enough for it to be somewhat denser, so you should manage as it is today.
I have talked to expertise, specifically Technical Support at Isover. There are no rules, but the recommendation they give is that you should have plastic in the walls and ceiling, and I should take down the existing inner wall board and put the plastic directly against the insulation, and then put the board back. Also, complement with vents (in and out) http://www.isover.se/teknisk-support
Hmm, sounds like a "fun" summer project...
Hmm, sounds like a "fun" summer project...
Good luck