I want some sound insulation under the bathroom floor. I have not had to do this for a long time and looked for dense, heavy batts in a grey/brown colour, that do not shed dust and fibres like loft insulation (I am somewhat asthmatic)
I found bales of 50mm for cavity walls, and 75mm for going under screeded floors. The 75mm would need a lot of cutting and waste to fit, but the 50mm looks dense and feels suitably heavy when I lift the bale, and is about the right size to fit snugly between my 14" centres joists
However it is marked "For cavity wall Insulation Only"
I wonder why this is? might it have some characteristic that makes it unsuitable for my purpose? Are there different grades for different usage? Or might it just be that it has only been tested and approved for cavity walls?
I found bales of 50mm for cavity walls, and 75mm for going under screeded floors. The 75mm would need a lot of cutting and waste to fit, but the 50mm looks dense and feels suitably heavy when I lift the bale, and is about the right size to fit snugly between my 14" centres joists
However it is marked "For cavity wall Insulation Only"
I wonder why this is? might it have some characteristic that makes it unsuitable for my purpose? Are there different grades for different usage? Or might it just be that it has only been tested and approved for cavity walls?