Conservatory base insulation

[The_gazza]

Hello there,

Simple query I hope. I’m planning a conservatory for which I will lay a concrete base and would want to insulate a it.

My plan is to put a 100mm hardcore, 50 mm sand, DPM, insulation then 100mm concrete. This feels like the correct sandwich but what do I use as insulation?

Polystyrene seems to soft although would give excellent insulation, I found a heavy duty insulation which apparently has a “very high compressive strength” but it also says its for walls and floors?

Advice appreciated. Garry

 

[noseall]

100mm polystyrene is fine with b.c. so go with it.

 

[The_gazza]

Cheers M8,
Garry

 

[Richard C]

Garry
My builders used 100mm Jabolite (basically polystyrene) on my new conservatory last year but if doing it again I would insist on Cellotex; it’s more expensive but is far superior regards insulation properties.

 

[The_gazza]

Hi Richard,

Thanks for the advice, looked at the Celotex site - loads of info. I think we'll go with that.

Garry