Celotex safe ?

[Bio boy]

Kingspan panels are they safe to just grow in I have fully insulated the loft with50mm so I can just grow in the room hang the lights on the triangle 30cm off the pitched roof

 

[Three Berries]

I would say yes. I lined my closet with it and grew for 4 years like that. The stuff is almost fireproof. Takes a long hot fire to get it going.