ᐅ Drywall Mold?

The architect told me that I don’t need to ventilate because, in this weather, it would only bring in unnecessary additional moisture, those were his exact words.

I want to describe this in simple terms. Imagine you are in a comfortably warm heated bathroom, filling the bathtub with water, then lying down in it. What happens? The mirror fogs up just when you want to style yourself after a long bath. What do you do? Wipe the mirror, or briefly tilt or open the window? Observe what happens.

Best regards, Sigi

Hello

The right solution is / would be to dry the building and, of course, all other areas technically, especially in this kind of weather.

Olli

I had insisted on that, but the architect rejected it. I have now sent him a written notice of the defect, asking him to find a solution together with the drywall contractor.

Without heating, ventilation currently doesn’t help much. At 10°C (50°F) outside and 99% relative humidity, you need about 20°C (68°F) indoors to get the relative humidity below 55% (or similar – just Google relative humidity).

The principle is air exchange; ideally replacing warm, moist air with dry, cold air.

oggear51 schrieb:
The architect told me that I don’t need to ventilate because in this weather it would only bring in unnecessary additional moisture, that was his exact wording

I see it a bit differently; during the first 1.5 weeks of February, temperatures in NRW were still around ±12°C (54°F). At that time, airing out the building by opening windows briefly would probably have been beneficial. After that, technical drying should have been used until the heating program started.

The more interesting question, however, is: do you have the architect’s statement about ventilation/drying not being necessary for the new building in writing? Otherwise, it will certainly become an issue when it comes to covering the costs.

Regards, Bauexperte