ᐅ Insulation of Basement Ceiling with Mineral Wool – How to Install
Created on: 8 Dec 2022 10:16
H
Herbert 80
Hello. I have a house with a full basement.
Currently, there is no insulation applied, so the boards are directly visible.
I have now received quite a few stone wool boards with a thickness of 60mm (2.4 inches) as a gift.
These boards are coated on both sides with a firmer white material to allow the boards to be glued directly to the ceiling.
The problem is the ceiling height.
60mm (2.4 inches) is too thick for me. I would have to cut the boards in half, so to 30mm (1.2 inches), to still be able to walk around (unfortunately, very low ceiling height).
However, after cutting them in half, the white coating would be removed, so I would have to glue the stone wool directly to the ceiling.
I would cut them with a pruning saw with a good guide to keep the cut surface even.
Does anyone have experience with this?
Best regards, Herbert
Currently, there is no insulation applied, so the boards are directly visible.
I have now received quite a few stone wool boards with a thickness of 60mm (2.4 inches) as a gift.
These boards are coated on both sides with a firmer white material to allow the boards to be glued directly to the ceiling.
The problem is the ceiling height.
60mm (2.4 inches) is too thick for me. I would have to cut the boards in half, so to 30mm (1.2 inches), to still be able to walk around (unfortunately, very low ceiling height).
However, after cutting them in half, the white coating would be removed, so I would have to glue the stone wool directly to the ceiling.
I would cut them with a pruning saw with a good guide to keep the cut surface even.
Does anyone have experience with this?
Best regards, Herbert
H
Herbert 8024 Mar 2023 13:56Hello. I wanted to give an update after completing the work. I removed the wooden panels, installed insulation between the roof battens, and then reattached the wooden panels. The insulation thickness was reduced with a saw from 6cm (2.4 inches) down to about 3cm (1.2 inches) due to the low ceiling height. I know 6cm (2.4 inches) would have been better, but I simply did not want the ceiling any lower. I used Knauf Perlfix adhesive. It works well and holds securely.
The difference measured with the thermal imaging camera was already about 1.5°C (2.7°F) between bare concrete and concrete with 3cm (1.2 inches) of rock wool insulation. Adding the 18mm (0.7 inches) thick wooden panels improved the result by another 0.5°C (0.9°F).
Conclusion: Insulating the ceiling with rock wool is not enjoyable, but it offers a lot of flexibility regarding uneven surfaces. The power consumption of the underfloor heating on the ground floor didn’t really decrease significantly. Regardless, it’s better than nothing, and I plan to insulate the other rooms as well.
Thanks again for all your good advice!
The difference measured with the thermal imaging camera was already about 1.5°C (2.7°F) between bare concrete and concrete with 3cm (1.2 inches) of rock wool insulation. Adding the 18mm (0.7 inches) thick wooden panels improved the result by another 0.5°C (0.9°F).
Conclusion: Insulating the ceiling with rock wool is not enjoyable, but it offers a lot of flexibility regarding uneven surfaces. The power consumption of the underfloor heating on the ground floor didn’t really decrease significantly. Regardless, it’s better than nothing, and I plan to insulate the other rooms as well.
Thanks again for all your good advice!
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