Black sealer

grogi

I need to seal some gaps to prevent unpleasant drafts in...

Some are in the floor: old planks, with tongue'n'groove - some must have been removed to facilitate the repairs - and the tongue part is missing in a few places. The space under the floor is ventilated and the planks otherwise look healthy. It is not get best insulation, but if I could prevent the air during windy days from coming in, that would improve the feeling a lot.

I've spotted some tiny gaps in the ceiling structure as well. The ceiling is going to be mineral-wool insulated, but nevertheless sealing those gaps would be a good idea not to introduce a pressure difference...

I was thinking about some kind of insulation foam that can be injected with a thin tube. Preferably black...

Any suggestions or comments would be highly appreciated.

grogi

Not a single comment on the material I should use?

Is expanding foam appropriate for the job or will collapse when the wood slightly changes size due to humidity absorption?

Calahonda52

You need to get the floor airtight as if you live in a radon active area, its not good
https://www.epa.ie/radiation/radonmap/

Ceiling gaps are best done with filler, maybe even painters mate and painted over, no business with either foam or sealer