ᐅ Screed Heating Phase and Severe Fruit Fly Infestation?

We are building (or having built) our dream house and have had a crazy problem for a few days now.

The exterior of the house is already plastered and painted.
All the windows are installed.
The roller shutter boxes are still empty.
All interior walls are plastered.
Screed has been laid over the underfloor heating.
We are currently in the heating-up phase and ventilating a lot.

For about five days now, we have noticed tiny black flies about 1-2 mm (0.04-0.08 inches) in size inside, around all the windows—in huge numbers!
If you wipe them away with a cloth, they seem to be gone… or so you think.
But as soon as the windows are closed, after a few minutes the number builds up again.
This happens on both the ground and upper floors.

We have read a lot online about larvae in flowerpots and fruit and so on, but none of that applies here.
Since we are still building, there are no plants, fruit, or furniture inside the house yet.
We are at a loss on how to get rid of these pests.

Has anyone experienced this problem before?
Does anyone have any ideas?
Could this be related to the current weather—humid, warm, with thunderstorms?
Or nearby meadows and forest?
We would appreciate any advice!

Best regards

Completely normal ... nature ... glass with oil wine mix

Uhm..... we now live in a small town on the outskirts, then there is one more house and a lot of open fields, and we have never had this problem before????

What do you mean by "nature" – is that supposed to be the standard now???? oops:
That would be really unpleasant... that many insects and still living inside... well, great.....

Thanks for the tip – we will give it a try.

Question – what kind of tiny flies are those???

Skorpi-Haus schrieb:

um..... we now also live in a small town on the outskirts, then there is one more house and then a lot of meadow, and we never had this problem before????

What do you mean by - nature - should that now be the standard????? oops:
That would be really unpleasant... so many of them and then living inside ... very clean.....

Thanks for the tip - we will try it.

Question - what are those tiny flies then?????

Completely normal fruit flies. Something is attracting them.

Skorpi-Haus schrieb:

Question – what kind of tiny flies are those?????

Hello Skorpi-Haus

Try taking a photo, ideally a macro shot. Fruit flies (2–3mm (0.08–0.12 inches)) are good fliers, and you can clearly see their wings. There might be some fruit fermenting in an open spot somewhere. Remove the fruit, and the flies will disappear.

Steven

Hello

or they are the so-called thunder flies (Chironomidae). They are a bit smaller, black, and elongated. They don’t fly as gracefully.
Vacuum them up. Hang a blue sticky tape. It attracts the insects.

Steven