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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Alibert8714 Dec 2022 09:00dertill schrieb:
Better to have something around 24cm (9.5 inches). The most cost-effective solution is cellulose insulation between the rafters, then crosswise battens with even more cellulose on top, followed by rough boards / rafter sheathing. For wooden beam ceilings, don’t forget to install a vapor retarder on the underside and make sure the connections are AIR-TIGHT! I only wanted to insulate the attic floor including the folding staircase. I thought that would be the simplest and most affordable option, right?
Alibert87 schrieb:
I only wanted to insulate the floor of the attic including the folding attic ladder. I thought that would be the simplest and most cost-effective option, right? Yes, exactly. However, the transition between the living space and the insulation in the attic must be airtight or sealed. Otherwise, the insulation won’t be effective and can become damp due to condensation. Whether the seal acts as a strong vapor retarder or not is less important in ventilated attics. What matters more is that there are no leaks (for example, ceilings with small-scale wood paneling, knee walls).
Insulating and sealing the attic hatch is also a sensible measure.
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Alibert8714 Dec 2022 09:34dertill schrieb:
Yes, exactly. Still, the transition from the living space to the insulation in the attic needs to be airtight or sealed. Otherwise, the insulation won’t be effective and will get damp due to condensation. Whether the seal is highly vapor-retardant or not is less important in ventilated attic spaces. What matters much more is that there are no leaks (e.g. ceilings with detailed wooden paneling, knee walls).
Insulating and sealing the attic hatch is also a sensible measure.Sorry, I’m a complete beginner here. I need to ask a basic question again:
So, I put a vapor retarder on the attic floor, then lay a thick insulation material on top, and that’s it?
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Torti2022neu14 Dec 2022 10:04Tolentino schrieb:
So 10cm (5 inches) PUR usually costs 35 euros per sqm?
Second choice costs around 20 euros per sqmYep. Roughly between 32 and 35 euros online. 16.50 euros at Smartbau. The insulation shop also offers pretty good prices.W
WilderSueden14 Dec 2022 15:09Alibert87 schrieb:
Sorry, I’m a complete beginner here. I need to ask a basic question:
So, I put a vapor barrier on the attic floor, then lay a thick insulation layer on top, and that’s it?What type of ceiling do you have, and how do you plan to use the attic? Does the insulation need to be walkable?A
Alibert8714 Dec 2022 15:16WilderSueden schrieb:
What type of ceiling do you have and how do you plan to use the attic? Does the insulation need to be walkable?No, we don’t need any storage space upstairs. At most, a suitcase or Christmas ornaments might be kept there 🙂So, insulated as well as necessary, but as cost-effective as possible.
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