ᐅ Triple Glazing and Mold?

Hello everyone,

I currently live in an old building with only minimal insulation.

The U-value of the façade is 0.965 W/(m²K).

Now, my house has many very large window areas; the south side is almost entirely windows, both at the top and bottom. These windows will naturally be expensive, and I could only get financial support if I use triple glazing.

However, these new windows mostly have a lower U-value: between 0.81 and 0.93. Is there a high risk of mold developing in this case? Would it be better to choose double-glazed windows instead?

taskyyy schrieb:

These new windows mostly have a lower U-value: 0.81 to 0.93. Is there a high risk of mold developing? Would it be better to choose double-glazed windows instead?

It is not the glazing that causes mold. It is the airtight installation (please note that using only foam is no longer state of the art) and user behavior.
==> Proper heating and ventilation are the two key factors to consider.

Then there will be no mold problems.

Benutzer200 schrieb:

It is not the glazing that causes mold. It is the airtight installation (please note that using only foam is no longer state of the art) and the user’s behavior.
==> Proper heating and ventilation are the two key factors to consider.

Then there will be no mold problems.

Thank you, so this means:

The window installer must ensure everything is installed airtight and perfectly.
Regular full airing out should be done, not just tilting the window.
It should be ensured that the humidity level stays between 40-60%, ideally measured with a hygrometer.

If this is done accordingly, mold is basically prevented.

Correct?

taskyyy schrieb:

If this is done properly, mold is basically ruled out.

Yep. The only potential issue could be cabinets placed flush against the wall, as no air circulation can occur there. But that is something you can control yourself.

Benutzer200 schrieb:

Yep. The only potential issue can be cabinets placed directly against the wall, as there is no air circulation there. But that is something you can control yourself.

Exactly, but as long as you maintain some distance, it shouldn’t be a problem.

taskyyy schrieb:

If this is done properly, then mold is basically ruled out.

Right?

You forgot to mention proper heating.
If you have cold walls and the air temperature is only 20°C (68°F), everything will condense on the walls. This can be especially problematic in the bedroom, where the heating is usually lower.