Following other threads on this forum I am planning to insulate some skeilings in my house using 50mm air gap/50mm polyurethene ridged type insulation between the rafters (e.g. Kingspan K7 or Cellotex GA3000)/ 50 - 75mm polyurethene backed plasterboard (e.g. Kingspan K18).

Looking at the various products wondered if anyone could tell me the difference between Cellotex GA3000 and Kingspan K7 or Kingspan Thermapitch. The Cellotex appears to be about third of the price of the Kingspan.

Thanks.

What are Skeilings?

the slope/curve bit on the ceiling , chalet bungalows etc.
I call it a scaled ceiling

Nothing to do with the insulation just a tip on skeilings, never tape and joint the junction with the ceiling, you'll never get a straight line, it will just looks pants, always curve it out with plaster and decorate it with the ceiling.

I think K7 is more expensive because it has intumescent (fireproof) properties. If you are going over the top with plasterboard you probably don't need it (need to check). So if you want to use kingspan ask for a price on TP10 - usually the price for Kingspan, Cellotex, Ecotherm etc. etc. is pretty much the same where the product spec is the same.

Same story with the stuff laminated onto plasterboard K18(intumescent) is more expensive than the old TW36 which kingspan have stopped supplying but you can get made up by insulation suppliers if you ask.

S.

Got curves on my skeilings . looks good as well.