The attic of our new build is accessed by a pull-down ladder. There are no windows there – neither in the gable nor any roof windows.
During the building drying phase (after plastering and after the screed), the hatch to the attic was completely closed. This was explained to us as a way to prevent mold growth. Since then, the pull-down ladder has been installed, and the attic has been lined with drywall panels. Now we notice a musty smell there, and mold spots are forming on the panels.
What can be done at this point? I have also asked the carpenter for advice at the same time.
During the building drying phase (after plastering and after the screed), the hatch to the attic was completely closed. This was explained to us as a way to prevent mold growth. Since then, the pull-down ladder has been installed, and the attic has been lined with drywall panels. Now we notice a musty smell there, and mold spots are forming on the panels.
What can be done at this point? I have also asked the carpenter for advice at the same time.
H
Heidi196527 May 2021 09:48I believe our attic is within the thermal envelope. It is very well insulated. For now, I have fully opened the attic hatch and tilted all the windows on the upper floor. After wallpapering and painting, there was more moisture in the house again. I treated the mold spots with spray. Now it at least smells like chlorine and not musty anymore. Somehow, I feel that the climate in the attic is better when the attic hatch/staircase is left open as much as possible. Maybe the moisture can only be permanently removed from the attic once the painting work is finished.
For us, the actual thermal envelope is the ground floor with an insulated ceiling between floors. The floor is outside of this and was originally completely uninsulated as a basement substitute, making it only partially usable because it was too cold or too hot, and also too damp in winter. That’s why it was later insulated in the extension level. The Velux window is invaluable for ventilation and natural daylight.
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