I can’t quite decide if this is a good idea. I’ve laid a 125mm thick concrete slab for the hot tub and was thinking to put Celotex under it to retain the heat. I e-mailed them and they said it wasn’t suitable and to use something with a higher compressive strength.
Now I’m thinking 20mm of this but not sure if the numbers add up:
And the spec:
There will also be plastic grass between the tub and insulation but if it would be better I could cut that around it.
Any advice would be much appreciated.
Now I’m thinking 20mm of this but not sure if the numbers add up:
And the spec:
There will also be plastic grass between the tub and insulation but if it would be better I could cut that around it.
Any advice would be much appreciated.