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
A
Alibert8714 Dec 2022 07:03Torti2022neu schrieb:
Roughly half the normal price you find online you call "not so cheap"? LOL – I’m lost for words.
Sure, compared to free it’s definitely more expensive (and also bulkier). That’s true and I understand that. But overall, these are amazing prices for a product where you often don’t even notice why it’s second choice quality.
On the other hand, you get insulation instead of homeopathy like with your originally planned 30mm (1.2 inches) mineral wool. The 100mm (4 inches) PUR also brings your basement ceiling roughly to KfW55 standard, which makes a huge difference. Sorry, I didn’t mean to sound arrogant… I had researched other first choice prices afterwards. So 10cm (4 inches) PUR usually costs around 35 euros per m² (square meter)? Second choice is about 20 euros per m² (square meter).
Alibert87 schrieb:
Can this be used in 100mm (4 inches) thickness for basement and upper floor ceilings? Is that enough?Basement below concrete ceiling: Yes – but you need to anchor it mechanically because it is aluminum foil laminated on both sides, so the adhesive bond with insulation glue won’t be reliable. It’s better to use single-sided foil laminated PUR and glue it.
Upper floor ceiling: Why use PUR there? Other insulation materials are cheaper for the same thermal performance (just thicker), and you usually have enough space above. But you can use PUR if you want, at least on concrete ceilings, without any problem.
A
Alibert8714 Dec 2022 08:34dertill schrieb:
Basement under concrete ceiling: Yes – but you have to use mechanical fasteners, since it is aluminum foil laminated on both sides and therefore the adhesive with insulation adhesive will not hold reliably. It is better to use one-sided laminated rigid polyurethane foam (PUR) and glue it.
Upper floor ceiling: Why use PUR there? All other insulation materials are cheaper for the same insulating effect (just thicker), and usually you have space above. However, it can be safely used, at least on concrete ceilings. So for the attic floor, is it sufficient to use at least 14cm (5.5 inches) glass wool, or is stone wool better?
Alibert87 schrieb:
So for the attic floor, is 14cm (5.5 inches) of glass wool enough, or is rock wool better?Better go with 24cm (9.5 inches) or so. The most cost-effective solution is cellulose insulation between the rafters, then cross battens with even more cellulose on top, and finally rough boarding or roof battens. For wooden beam ceilings, don’t forget to install a vapor retarder underneath and make sure to seal the connections airtight.