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
Alibert8713 Dec 2022 15:23Tolentino schrieb:
You can use PUR/PIR insulation, then you need less thickness.
You didn’t get any mineral wool for free, right?
If you win the lottery, you can go for vacuum insulation panels. Then 2cm (0.8 inches) would be enough.If rigid foam boards are twice as expensive as mineral wool, the calculation is straightforward. Unless I need twice the thickness compared to rigid foam boards. So, does 10cm (4 inches) of rigid foam board perform like 14cm (5.5 inches) of mineral wool? Is that correct?
Alibert87 schrieb:
So, do 10cm (4 inches) rigid foam boards perform like 14cm (5.5 inches) mineral wool?Yes, 10 cm (4 inches) of mineral wool with a thermal conductivity value (WLG) of 0.035 roughly provides the same thermal resistance as 14 cm (5.5 inches) of 0.024 PUR foam.Even 10 cm (4 inches) of mineral wool offers some insulation—the first few centimeters are the most important. Ideally, 14 cm (5.5 inches) of mineral wool would be better, but if only 10 cm (4 inches) is possible, that’s still good. Whether the higher cost of PUR pays off depends on energy prices and material costs. PUR is easier to install because it is very lightweight and can be glued without thermal bridges using foam adhesive; plus, gaps can be filled with expanding foam. With mineral wool, you need something to hold it in place, like temporary supports or scaffolding, and application of mortar or adhesive tends to be messier.
T
Torti2022neu13 Dec 2022 16:34Alibert87 schrieb:
If rigid foam boards are twice as expensive as mineral wool,That’s why I always recommend PUR second grade for applications like this. There is almost no difference compared to first grade – the price per square meter is about €16 (around 10cm (4 inches)) plus shipping or free pickup. It’s much easier to work with than mineral wool, which saves both time and money. And if you want a nice finish, simply glue thin drywall (Renoboard) underneath with the same foam adhesive, tape and plaster the joints, and paint. It then looks like a “real” ceiling.
A
Alibert8713 Dec 2022 18:49Torti2022neu schrieb:
That’s why I always recommend using second-grade PUR for these kinds of applications. There’s hardly any difference from first-grade – it costs about €16 per square meter (10cm (4 inches) thick) plus shipping or free pickup. It’s also much easier to work with than mineral wool (stone wool), which saves time and money.
And if you want a really nice finish, just glue thin drywall panels (Renoboard) underneath with the same foam adhesive, then apply joint compound and paint. It will look like a "real" ceiling. Where can you get second-grade material from?