I have two questions about indoor ceilings:
We have received a building permit for an extension. On the construction drawing, the designer has drawn drywall ceilings throughout the extension even though we have panels in the existing space. We want panels, but to be sure, I wonder if there are fire regulations for new builds that require drywall?
In the wet room, he has specified foil-coated chipboard (which contradicts the fire question...). If you install panels, should you have something underneath in place of the "foiled"?
I could certainly ask the designer, but he was an unusual man who was not very attentive to his work and more concerned about how we are "running" our extension project.
We have received a building permit for an extension. On the construction drawing, the designer has drawn drywall ceilings throughout the extension even though we have panels in the existing space. We want panels, but to be sure, I wonder if there are fire regulations for new builds that require drywall?
In the wet room, he has specified foil-coated chipboard (which contradicts the fire question...). If you install panels, should you have something underneath in place of the "foiled"?
I could certainly ask the designer, but he was an unusual man who was not very attentive to his work and more concerned about how we are "running" our extension project.
The foil is to get a different surface and avoid painting. There's a vapor barrier behind that should be used but only on the upper floor. You should plast the new exterior walls as well, right? Then use the same as there.
http://www.boverket.se/Global/Om_Boverket/Dokument/planera_bygga_bo/2007/Nummer_5/Artikelarkiv/Farlig_fukt_i_badrummen.pdf
"Removing the plastic foil is not a solution either, he pointed out. When it gets cold outside, condensation forms which causes moisture damage to the wooden frame. The best – and perhaps simplest way to avoid the moisture problem is not to place bathrooms against exterior walls."
And I have no idea which line to follow, just pointing it out.
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Well, everything can be discussed, but the link referred to above pertains to a wall with a roll-applied moisture barrier performed in 2005-2006, so it is not relevant. A denser moisture barrier does not solve the problem with moisture between the barriers either. The wall consists of damp room boards, plyfa, studs, 45 mm insulation, and plastic (vapor barrier), so there is an opportunity for normal moisture migration into the construction from the sides, from above, and from below, and it then remains between these moisture barriers. Removing the vapor barrier makes it correct and follows the same principle as other exterior walls with the moisture barrier/vapor barrier on the inside.
If moisture can get in from the sides, it can also come from there. The important thing is that no moisture is added by coming through the waterproofing membrane, and it is considered not to do so with modern waterproofing membranes.