I am redoing the bathroom ceiling to reduce moisture load in the attic and need advice on where to place the vapor barrier. On this forum, there are many variations of how the plastic has been placed and I can't figure out what is best.
Facts:
Wooden house with 2 floors + basement from 1944 with new attic insulation (ecofiber) about 30 cm. Partial vapor barrier in the ceiling of the upper floor towards the attic. Mechanical exhaust ventilation in three places in the house (3 bathrooms).
The bathroom ceiling is lowered about 15 cm to accommodate LED spotlights, which will likely be placed in cans.
The ceiling construction will be with appropriate beams + sparse paneling + plasterboard.
The question is how I should attach the plastic:
1. Stapled to the old ceiling and brought down under the wall studs and sparse paneling against the wall.
2. Between the sparse paneling and plasterboard, with cutouts in the plastic for the LED cans and glued edge.
3. Above the LED cans, probably above the beams.
Or maybe some other alternative?
The ceiling will be painted with wet room paint to be easy to wipe off, but the holes will likely let moisture through into the sub-ceiling.
I'm leaning towards option 1 because it seems so simple. To ventilate the sub-ceiling, I thought of drilling some holes in the duct of the exhaust fan to allow some air transfer from the sub-ceiling as well.
What does the collective wisdom here think?
Facts:
Wooden house with 2 floors + basement from 1944 with new attic insulation (ecofiber) about 30 cm. Partial vapor barrier in the ceiling of the upper floor towards the attic. Mechanical exhaust ventilation in three places in the house (3 bathrooms).
The bathroom ceiling is lowered about 15 cm to accommodate LED spotlights, which will likely be placed in cans.
The ceiling construction will be with appropriate beams + sparse paneling + plasterboard.
The question is how I should attach the plastic:
1. Stapled to the old ceiling and brought down under the wall studs and sparse paneling against the wall.
2. Between the sparse paneling and plasterboard, with cutouts in the plastic for the LED cans and glued edge.
3. Above the LED cans, probably above the beams.
Or maybe some other alternative?
The ceiling will be painted with wet room paint to be easy to wipe off, but the holes will likely let moisture through into the sub-ceiling.
I'm leaning towards option 1 because it seems so simple. To ventilate the sub-ceiling, I thought of drilling some holes in the duct of the exhaust fan to allow some air transfer from the sub-ceiling as well.
What does the collective wisdom here think?