Currently building an upper floor; it's a Skånelänga with mixed walls on the lower floor. Everything from bricks, clay bricks, Leca, etc. My problem is at the transition from the sloped roof to the lower wall. There is no foil in the joists from below since it's warm air on both sides, but I think there will be cold air infiltration from the side right where the wall meets the roof. Cold air might go straight into the joist space and cool down the air coming from the ground floor?? I don't understand how I should lay the plastic foil. It comes down from the sloped roof towards the joists. Should it just be laid against the floorboards, or does it need to be tucked between the joists to make it completely airtight?
ombyggarren
ombyggarren
I don't exactly understand what you mean with
You definitely don't want cold air to be able to draft into the floor between the levels. You need to prevent that.
I myself have an old rebuilt and extended Skåne farmhouse. The upper floor, which was previously used to store grain, is now furnished and has plastic on the ceiling and walls. However, there are drafts at the edges between the floor, walls, and ceiling. Probably because no one bothered to seal and windproof properly. When it blows, which it does quite often here in Skåne, everything moves and gaps open up/expand, and air is pushed into anything that resembles gaps on the windward side, and sucked out similarly on the leeward side. It doesn't help, of course, if there are rodents in the house either.
In my case, the plastic from the slanted roof goes down the interior wall, (the low one along the house), and stops at the floor chipboard, which in turn stops at that wall. That is, the attic space (cold attic) has no floor, and in the old part of the house, there is quite certainly no plastic in the ceiling of the ground floor, so moisture from inside can find its way out to the attic. From what little I've seen/can see of the attic, it doesn't seem to have led to any problems (yet). The renovation was done about 30 years ago, so it probably won't lead to any problems either.
Can you upload an image?
You definitely don't want cold air to be able to draft into the floor between the levels. You need to prevent that.
I myself have an old rebuilt and extended Skåne farmhouse. The upper floor, which was previously used to store grain, is now furnished and has plastic on the ceiling and walls. However, there are drafts at the edges between the floor, walls, and ceiling. Probably because no one bothered to seal and windproof properly. When it blows, which it does quite often here in Skåne, everything moves and gaps open up/expand, and air is pushed into anything that resembles gaps on the windward side, and sucked out similarly on the leeward side. It doesn't help, of course, if there are rodents in the house either.
In my case, the plastic from the slanted roof goes down the interior wall, (the low one along the house), and stops at the floor chipboard, which in turn stops at that wall. That is, the attic space (cold attic) has no floor, and in the old part of the house, there is quite certainly no plastic in the ceiling of the ground floor, so moisture from inside can find its way out to the attic. From what little I've seen/can see of the attic, it doesn't seem to have led to any problems (yet). The renovation was done about 30 years ago, so it probably won't lead to any problems either.