50mm slab insulation - can it be compressed thinner?

[shorn]

Hi,

I've just built a shed, and I am looking at insulating it before timber cladding the interior.

I'm looking at the different options to insulate, and originally was considering polystyrene and then came across Wickes general Purpose Slab Insulation. This stuff is 50mm thick.
Does anyone know if its possible to compress it further? I have a 38mm cavity, and was wondering if its possible to squeeze it down by the extra 12mm when I'm cladding over?

Thanks!

 

[freddiemercurystwin]

No. Just buy some thinner insulation.

 

[Norcon]

If its mineral wool then it should compress.

 

[shorn]

No. Just buy some thinner insulation.

Well this one only comes in a minimum thickness of 50mm hence why I was asking

If its mineral wool then it should compress.

Yes, it's mineral wool, I'll drop by tomorrow and have a look, hopefully will be able to tell!

 

[mattylad]

You can get polystrene in 25/28mm ish sheets.

I did my shed with this 20+ years ago when winters were colder and it worked well.

Dont forget to line with plastic sheeting, coat both sides with preservative etc.

 

[^woody^]

It will put pressure on any cladding if you try to compress it.

38mm of quilt is not much use in terms of insulation. You would be better off putting 25 or 35mm of Celotex (or any foil backed insulation board) which will be equivalent of twice as thick quilt

Or if you get fibreglass quilt (yellow) then you can crudely thin it down by tearing it to make it thinner - you can't do this with the green rockwool type

 

[shorn]

thanks for the replies and suggestions. I went with polystyrene in the end. Time will tell how effective it is.
Cheers!