Small question about insulation.

[Janne79]

Hello.
I know that you shouldn't compress insulation, but if you're insulating between two boards attached to 45x45 studs, and there's no room for thicker insulation, can you use 70mm insulation? It will be somewhat compressed, but does it insulate worse than 45mm?
The reason for the question is that I currently have 70mm lying around which currently serves no other purpose.

 

[hagv]

It is the stagnant air in the insulation that insulates. The more air, the better. That's why it's so good to use loose-fill insulation as it becomes fluffy and fine, and why it's worse when you compress the insulation. But if you have 70 insulation lying around, I would have used it anyway. 🙂

 

[Plutus]

You isolate to save money, and that suggests using what you have, can't you tear off a cm of the ullen?

 

[KnockOnWood]

One insulates to save money, so it makes sense to use what you have. Can't you just rip off a cm of the wool?

Sounds like sensible advice!

The insulation is quite "resilient," so if you try to fit a 70 mm board into a 45 mm space, the surrounding boards will likely bulge out, and the whole wall will look bumpy.

 

[hagv]

If you have discs made of A4 paper, they will probably be wrinkled, otherwise, there are no problems.

 

[Janne79]

Thanks for the answers. I was wondering if the insulation ability would get worse, but I'll try

 

[Bernieberg]

I spaced out with 28 mm battens for piping before putting boards on a plank wall. For soundproofing reasons, I wanted to take the opportunity to insulate. A 45 mm stone wool board caused the OSB to bulge with cc 600 mm between the studs, so the boards are certainly a bit springy. I ended up tearing the boards so they became half as thick. It worked better than expected.