Hello all experts, I have a small dilemma.
Should I put plastic in this ceiling, do you think?

The house is 50 years old and has no problems with moisture, but it's a bit drafty now that I've removed the old three-text ceiling. I will be installing a chipboard ceiling directly on the visible surface, the question is whether there should be plastic in between?

Thanks in advance
// Andreas
 
  • Exposed wooden beams and roof insulation with visible cracks, asking about using plastic sheeting for a 50-year-old house renovation project.
Not plastic. If it works without moisture damage now, you should not use plastic. You will then have a different construction with different ventilation requirements (positive pressure/negative pressure, etc.).
 
Should one use some form of windbreak paper instead? Since the old paper is damaged in many places.

Unfortunately, I have already started to put up the ceiling on about 1/4 of the entire surface, with plastic :eek:.

I intend to install a couple of vents in these rooms being renovated on the upper floor, as I'm also replacing the windows and the old ones have vents.

Maybe these vents aren't enough??
What problems could one expect if I were to encase the entire upper floor in plastic as I intend to do??

This seems to be a damn jungle.:(
//Andreas
 
Well, I think you should probably use plastic. Make sure it is tight between the plastic and the room while allowing some air circulation between the plastic and the roofing felt. If it becomes too tight between them, you could encounter problems.

If you combine the plastic with mechanical exhaust (i.e., negative pressure), you have eliminated the risk of problems. Plus, you'll get a drier attic and better air indoors.
 
Ok thanks,
I hope you understood what is meant. That this is the upper floor with a sloping ceiling and that it is insulated outside the paper visible in the picture.

There will be an air gap between the paper and the plastic with 22mm sparse paneling (as in the picture) and the ceiling directly against the plastic. (this is done for no particular reason, just for simplicity.)
 
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