Compressing Rockwool

[edphill]

Hi All,

Was wondering if anyone knows what exactly happens if you compress standard mineral wool such as rockwool into a smaller cavity.

So if you have a 200mm thick roll and squeeze it into a 100mm cavity.

They say it reduces performance, but does anyone know to what extent? Are there any other problems associated with fitting it into a tighter space?

Thank you.[/b]

 

[flameport]

For heat insulation, compressing it will remove a lot of the trapped air, so the performance will be significantly reduced.

For sound insulation, compressing it increases the density, so performance will be improved.

 

[mointainwalker]

I believe that if you compress 200 mm into 100 mm then you will have the thermal efficiency of 100 mm.

 

[big-all]

I believe that if you compress 200 mm into 100 mm then you will have the thermal efficiency of 100 mm.

yep the same here the trapped air is 95% off the benefit 200 mm to 100 may give you 105mm worth call it half

 

[geraint]

I believe that if you compress 200 mm into 100 mm then you will have the thermal efficiency of 100 mm.

yep the same here the trapped air is 95% off the benefit 200 mm to 100 may give you 105mm worth call it half

And more importantly. is 100mm compressed, the same as 270mm thrown around your loft..

 

[edphill]

That's really interesting - thank you everyone. Also that is exactly the figure I was after. Looks like I can't cheap out and use the mineral wool instead of Celotex in a 75mm cavity if I want it to stay warm!

I believe that if you compress 200 mm into 100 mm then you will have the thermal efficiency of 100 mm.

yep the same here the trapped air is 95% off the benefit 200 mm to 100 may give you 105mm worth call it half