A perhaps silly question:
If you have concrete flooring (e.g., ground/polished) without any additional surface layer, where do you finish the vapor barrier in the exterior walls?
I think I've seen an example where you bring the vapor barrier down and fold it inward, under something like parquet or tiles - is that how it's usually done?
Is it wrong to extend the vapor barrier outward, under the sill? Does it matter if it's under or over the sill paper?
In a way, it feels more correct to extend it outward, but at the same time, it would probably be difficult because the plastic would have to be placed before the sill is attached...
If you have concrete flooring (e.g., ground/polished) without any additional surface layer, where do you finish the vapor barrier in the exterior walls?
I think I've seen an example where you bring the vapor barrier down and fold it inward, under something like parquet or tiles - is that how it's usually done?
Is it wrong to extend the vapor barrier outward, under the sill? Does it matter if it's under or over the sill paper?
In a way, it feels more correct to extend it outward, but at the same time, it would probably be difficult because the plastic would have to be placed before the sill is attached...
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· Norrbotten
· 3 390 posts
I can't say what is formally "right", but down by the slab the vapor pressure is the lowest in the whole house, so I guess that in practice it doesn't really matter. I believe I've seen that it’s just stapled to the sill, that's it!
But as I said, a disclaimer...
But as I said, a disclaimer...
This seems to be a pretty smart thing: http://www.mynewsdesk.com/se/pressroom/paroc/image/view/sylltaetning-l-paroc-xss-015-40160
I assume that you then fold up the plastic from the seal and pull down the vapor barrier from the wall down to the sill and attach it.
The question is, the plastic from the seal inside or outside the vapor barrier from the wall? ;-)
I assume that you then fold up the plastic from the seal and pull down the vapor barrier from the wall down to the sill and attach it.
The question is, the plastic from the seal inside or outside the vapor barrier from the wall? ;-)
Hmm, now I'm a little confused - which one is being glued? The wall's plastic or the soleplate sealing?
EDIT:
Aha, maybe you meant if you only have the wall's vapor barrier...
Like here? http://www.passivhuscentrum.se/fileadmin/pdf/Utf%C3%B6rande_HBH.pdf
EDIT:
Aha, maybe you meant if you only have the wall's vapor barrier...
Like here? http://www.passivhuscentrum.se/fileadmin/pdf/Utf%C3%B6rande_HBH.pdf
This was exciting.
I myself had thought of just dropping the vapor barrier in line with the bottom edge of the sill.
Then there will be a 45x45 that is attached to the sill and clamps the plastic between. This 45 is thus the bottom rule in the internal cross-bracing.
Under the sill, I have foam sill-sealing, like the kind that resembles a sleeping pad.
So I have assumed that it should be good enough like that, but I might be wrong.
It should become airtight to prevent convection, but there is indeed a risk that a minimal gap offers an opening for moisture diffusion to the sill.
I could not for the life of me suspect that this would become a problem, but I might be wrong.
I myself had thought of just dropping the vapor barrier in line with the bottom edge of the sill.
Then there will be a 45x45 that is attached to the sill and clamps the plastic between. This 45 is thus the bottom rule in the internal cross-bracing.
Under the sill, I have foam sill-sealing, like the kind that resembles a sleeping pad.
So I have assumed that it should be good enough like that, but I might be wrong.
It should become airtight to prevent convection, but there is indeed a risk that a minimal gap offers an opening for moisture diffusion to the sill.
I could not for the life of me suspect that this would become a problem, but I might be wrong.
My previous link was wrong, this one probably works better:
http://www.passivhuscentrum.se/fileadmin/pdf/Utförande_HBH.pdf
Maybe it's a good idea to glue the plastic from the wall to the floor, then put a 45x45 on it that is attached to the sill? Belt and suspenders, so to speak... ;-)
http://www.passivhuscentrum.se/fileadmin/pdf/Utförande_HBH.pdf
Maybe it's a good idea to glue the plastic from the wall to the floor, then put a 45x45 on it that is attached to the sill? Belt and suspenders, so to speak... ;-)