I am debating weather to use the Kingspan 8'x 4' sheets or the Rockwoll roll 100 x 400 to insulate a suspended timber ground floor.
I have looked on the repsective websites for these manufacture's and cannot find the answer. The Kingspan references U-Values but these mean nothing to me!
What would give me the best results bearing in mind the cost difference per m^2. Roughly half the price for Rockwool!
Regards, Rich