Hello!
My wife and I have bought a house from 1912. The upper floor was renovated in the 80s, and they didn't do a great job...
We are doing all the renovations ourselves, and we have a very limited budget.
Currently, the hallway on the upper floor has a slanted ceiling with 7cm mineral wool insulation, no moisture barrier, and no ventilation gap. We wish to add 14cm of insulation, a moisture barrier, and a new ceiling underneath the old ceiling. It will still be very little insulation, but significantly better than it is currently. Unfortunately, we can't achieve 40cm, as the ceiling height is already very low.
We would prefer not to tear down the existing ceiling, but simply build below the current ceiling. Would that work, even though there still wouldn't be a ventilation gap after the renovation?
What suggests it could work:
*The current construction has no ventilation gap, and it is very healthy all the way through the ceiling. No signs of mold, moisture, rot, etc.
*We plan to add a moisture barrier to our addition, so less moisture should enter the ceiling from inside.
What suggests it might not work:
*A ventilation gap is recommended...
*The previous owner was 1 older man. We are 2 people. Most likely, more moisture will be generated in the house.
*We are changing the construction by adding a moisture barrier and 14cm more insulation, as well as a second ceiling under the existing one.
What do you think? Can we make our addition without adding a ventilation gap, or will it cause problems?
Thanks in advance!
Clarification regarding the construction:
----------------------------------
Roof tiles
Battens
Counter battens
Roof underlay
Sheathing
(Ventilation gap missing!)
Insulation
(Moisture barrier missing!)
Ceiling
-----------------------------------
NEW Insulation
NEW Moisture barrier
NEW Ceiling
My wife and I have bought a house from 1912. The upper floor was renovated in the 80s, and they didn't do a great job...
We are doing all the renovations ourselves, and we have a very limited budget.
Currently, the hallway on the upper floor has a slanted ceiling with 7cm mineral wool insulation, no moisture barrier, and no ventilation gap. We wish to add 14cm of insulation, a moisture barrier, and a new ceiling underneath the old ceiling. It will still be very little insulation, but significantly better than it is currently. Unfortunately, we can't achieve 40cm, as the ceiling height is already very low.
We would prefer not to tear down the existing ceiling, but simply build below the current ceiling. Would that work, even though there still wouldn't be a ventilation gap after the renovation?
What suggests it could work:
*The current construction has no ventilation gap, and it is very healthy all the way through the ceiling. No signs of mold, moisture, rot, etc.
*We plan to add a moisture barrier to our addition, so less moisture should enter the ceiling from inside.
What suggests it might not work:
*A ventilation gap is recommended...
*The previous owner was 1 older man. We are 2 people. Most likely, more moisture will be generated in the house.
*We are changing the construction by adding a moisture barrier and 14cm more insulation, as well as a second ceiling under the existing one.
What do you think? Can we make our addition without adding a ventilation gap, or will it cause problems?
Thanks in advance!
Clarification regarding the construction:
----------------------------------
Roof tiles
Battens
Counter battens
Roof underlay
Sheathing
(Ventilation gap missing!)
Insulation
(Moisture barrier missing!)
Ceiling
-----------------------------------
NEW Insulation
NEW Moisture barrier
NEW Ceiling