ᐅ Insulation of Basement Ceiling with Mineral Wool – How to Install
Created on: 8 Dec 2022 10:16
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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
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Alibert8713 Dec 2022 19:26Tolentino schrieb:
10cm (4 inches) PUR (thermal conductivity 0.025 W/(m·K), foil-faced) has a U-value of 0.235 W/(m²K). Nonwoven-faced (thermal conductivity 0.028 W/(m·K)) would have 0.261.
14cm (5.5 inches) mineral wool (thermal conductivity 0.040 W/(m·K)) has 0.266 W/(m²K).Can this be used as 100mm (4 inches) insulation for the basement and upper floor ceilings? Is that sufficient?
Alibert87 schrieb:
Where can you get second-quality materials?Well, my Google still works. Is yours broken? Using search terms like "pur pir 2nd choice" together gives an almost perfect result.T
Torti2022neu13 Dec 2022 20:04Alibert87 schrieb:
Where can you get second-choice materials? I usually go to Dämmstoffkönig or Smartbau in Nettetal, depending on what I need. From PUR/PIR foam to mineral wool and resol foam. You should look it up online – I’m not allowed to post links.
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Alibert8713 Dec 2022 20:39Torti2022neu schrieb:
I usually go to Dämmstoffkönig or Smartbau in Nettetal, depending on what I need. From PUR/PIR foam to mineral wool and resol insulation. You should look them up online – I’m not allowed to post links. Yes, I found those two as well. But the trip isn’t really worth it; it’s not that much cheaper. It would be about 150 km (93 miles) each way.
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Torti2022neu13 Dec 2022 22:18Alibert87 schrieb:
But the trip isn’t worth it; unfortunately, it’s not that cheap after all.Calling roughly half the regular online price “not that cheap”? LOL – I’m at a loss for words.Sure, compared to free it’s definitely more expensive (and bulkier). That’s true and I get that. Overall, though, these are amazing prices for a product where you often don’t even notice why it’s second grade.
But in return, you get insulation, not homeopathy like with your originally planned 30mm (1.2 inch) mineral wool. The 100mm (4 inch) PIR also brings your basement ceiling roughly up to a KfW55 basement ceiling standard, which of course makes a huge difference.