ᐅ Drywall Mold?

Created on: 21 Feb 2016 18:15
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oggear51
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oggear51
21 Feb 2016 18:15
Hello,

The cement screed has been installed for about three weeks now, and small black spots are gradually appearing on the drywall panels upstairs.

Ceiling with stains, flaking, and white plaster areas.


Unfinished plastered ceiling with white filler spots and circular markings.


Green drywall with many white filler spots at joints and corners.


Room ceiling with leftover filler and a hanging white cable line.


Is this mold? It looks like mold to me.
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oggear51
21 Feb 2016 19:25
The problem is that at such temperatures, ventilating without heating simply doesn’t help.
The heating will be turned on only next week.
By the way, isn’t drywall installation supposed to take place only after the plaster and screed are dry?
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HausAlex
21 Feb 2016 19:51
oggear51 schrieb:

Just a different question: doesn't the drywall installation take place only after the plaster and screed have dried?

In our build, it was like that.
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oggear51
21 Feb 2016 19:57
sounds logical as well
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Legurit
21 Feb 2016 20:45
Ideally, it should be done like this... but unfortunately, it wasn’t with us either, with the argument that they wanted to plaster directly onto the panels.
The result was similar for us—although not as severe (or widespread) as with you. The building inspector said these were stain marks, not mold (see Wiki for stain marks :rolleyes).
Ideally, you should have the affected panels replaced—depending on the patience / expertise / threat potential / understanding of the general contractor, mold-killing treatments or sprays are often used instead.
In our case, the panels around the roof windows were replaced because condensation was actually running down there. The others were treated twice, sanded down, then filled and painted with solar silicate paint (which also adheres to drywall). I do regret this a little in hindsight.
In normal use, the mold should no longer appear—moisture condensation is almost impossible with proper ventilation.
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oggear51
21 Feb 2016 21:02
I think I'll remove a panel tomorrow to take a look behind it.