10,226 views ·
21 replies
10k views
21 replies
Slab on ground - risk construction?
After looking at everything, I interpret it as being about a slab with overlying insulation with a plastic mat between the cellular plastic and the concrete. Have I interpreted it correctly?
If yes, wouldn't it be a perfect breeding ground for moisture/bacteria and mold between the plastic mat and the concrete?
If yes, wouldn't it be a perfect breeding ground for moisture/bacteria and mold between the plastic mat and the concrete?
Kan själv!
· Trelleborg
· 19 798 posts
If I'm not completely off track, organic material is needed for mold to grow, so there shouldn't be any problems.
well, the following is required, nutrients are guaranteed
relative humidity over 75%
temperature between -5°C and +55°C. Optimal temperatures for many molds are between 20°C and 30°C
nutrients, very small amounts of nutrients are needed
oxygen
presence of mold (spores and hyphal fragments).
It is good to know that if you remove just one of these 5 factors, the mold will disappear.
relative humidity over 75%
temperature between -5°C and +55°C. Optimal temperatures for many molds are between 20°C and 30°C
nutrients, very small amounts of nutrients are needed
oxygen
presence of mold (spores and hyphal fragments).
It is good to know that if you remove just one of these 5 factors, the mold will disappear.
Member
· Västra Götaland
· 1 849 posts
A common construction in the 80s. Typically, these were built with good drainage, so that is not the problem. However, there is always vapor pressure that causes the slab to contain moisture, which is not a problem in itself. The risk is if the slab was poorly cleaned before the plastic film was applied and/or if there was carelessness with the plastic film (aging-resistant film).
If done correctly, i.e., the slab is thoroughly cleaned before the plastic film, insulation (cell foam), and particleboard are installed, nothing organic is in contact with the slab. So even if the slab has high moisture content, no damage occurs.
The advantage of this construction is that it's easy to address problems, as everything is loosely placed on the slab (hence it's also called floating floor).
If done correctly, i.e., the slab is thoroughly cleaned before the plastic film, insulation (cell foam), and particleboard are installed, nothing organic is in contact with the slab. So even if the slab has high moisture content, no damage occurs.
The advantage of this construction is that it's easy to address problems, as everything is loosely placed on the slab (hence it's also called floating floor).
We all agree that it is about a slab with overlaying insulation?
Is there any other way to determine if there is moisture/mold problem under the floor? Besides visually, of course. Should one sniff in a specific place?
Going to look at the house today.
Is there any other way to determine if there is moisture/mold problem under the floor? Besides visually, of course. Should one sniff in a specific place?
Going to look at the house today.
Member
· Västra Götaland
· 1 849 posts
If there were any problems, the likelihood is highest that it smells along the walls. There is always a seam in the plastic (wall/floor). Just moisture under the slab is not an issue, rather it's if the plastic is not OK or if there is debris under the plastic that it becomes a problem. I have lived in such a house myself, was never worried for a second, well drained, well cleaned on the slab, and the plastic laid according to proper standards.Bob-TheBuilder said:
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