Ceiling condensation problem
published: 04/11/21, 13:49
Hello, here we have a house with an unused basement, living rooms, and upstairs.
- The basement is not heated but it is permanently 17 ° because the boiler heats the rooms (boiler pipes not very well insulated)
- The living rooms are currently at 19.5 ° with 68% humidity.
- The first floor is not heated and is made up of two parts: a part not insulated at ground level but with wooden floor with space above the joists / slab / concrete slab floor. This part of the floor although not being heated is at 18 °. It must be said that this part is well insulated at the level of the walls and receives a significant exposure to the sun given its small volume.
- The floor also consists of an unheated part on a concrete slab also whose current temperature is 12 ° with 68% humidity and this is where the problem occurs
This part of the floor is insulated at ground level, but very poorly; I distributed the glass wool in a roll but as we walk on it there are lots of thermal bridges, the glass wool is damaged. I also insulated a little with polystyrene but here too the polystyrene is damaged. I have dampness that has appeared in one of the bedrooms in the living rooms. I understood that the dew point being 12 ° for an air at 19.5 ° with 68% humidity, the problem came from there.
What would be the solution that would allow us to remove this condensation without heating the floor?
You should know that this floor has a ceiling that is six meters high. On the other hand, the roof, it is well insulated a priori (20 cms of rock wool).
If I put a centimeter of vermiculite or perlite upstairs, rather than this poor insulation at ground level, could that solve this condensation problem?
We should be able to walk on this insulation without destroying it.
- The basement is not heated but it is permanently 17 ° because the boiler heats the rooms (boiler pipes not very well insulated)
- The living rooms are currently at 19.5 ° with 68% humidity.
- The first floor is not heated and is made up of two parts: a part not insulated at ground level but with wooden floor with space above the joists / slab / concrete slab floor. This part of the floor although not being heated is at 18 °. It must be said that this part is well insulated at the level of the walls and receives a significant exposure to the sun given its small volume.
- The floor also consists of an unheated part on a concrete slab also whose current temperature is 12 ° with 68% humidity and this is where the problem occurs
This part of the floor is insulated at ground level, but very poorly; I distributed the glass wool in a roll but as we walk on it there are lots of thermal bridges, the glass wool is damaged. I also insulated a little with polystyrene but here too the polystyrene is damaged. I have dampness that has appeared in one of the bedrooms in the living rooms. I understood that the dew point being 12 ° for an air at 19.5 ° with 68% humidity, the problem came from there.
What would be the solution that would allow us to remove this condensation without heating the floor?
You should know that this floor has a ceiling that is six meters high. On the other hand, the roof, it is well insulated a priori (20 cms of rock wool).
If I put a centimeter of vermiculite or perlite upstairs, rather than this poor insulation at ground level, could that solve this condensation problem?
We should be able to walk on this insulation without destroying it.