ᐅ Why airtightness is important and what does it mean?

Hello everyone,

My builder told me that if I want to install recessed lights, speakers, or similar devices into the ceiling (ground floor) or a touch panel into the wall, I absolutely need to ensure airtightness. For this purpose, Thermo-X flush-mounted boxes could be used.

I have a few questions:

1. What exactly does airtightness mean in this context, even though I can imagine it to some extent, and what effect does it have indoors?

2. Why is it necessary to ensure airtightness specifically for the ground floor ceiling and an interior wall?

3. On the upper floor, am I only allowed to install recessed lights in a suspended ceiling? Why is this the case?

Note: The house is being built using timber frame construction.

Thanks in advance.

Best regards,
Christian

Otherwise, moisture will penetrate the structure and cause mold growth.

All right, thanks!

Cool, a house where you are not even allowed to drive a wall plug or nail into the wall or ceiling.

If a service cavity is planned, then yes.

Then such an LCD display should not pose any major problems.