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I never said it is wrong to use Kingspan. I just try to keep my beekeeping simple. What is it, in anyway? Their website has so many things on it, it's difficult to figure out how you use it. There appears to be several forms, which is the one you use?
This is my personal preferred product
http://www.wickes.co.uk/Celotex-50mm-High-Performance-Cavity-Wall-Board-450x1200mm/p/190546
not least because the sheet is small enough to fit in the car! (Thicker stuff only comes in big sheets - or skips!)
The price has actually gone down since last year.
If fussed you can put 2x 50mm layers inside the eke (above the coverboard). One well-fitted one does wonders.
The 'board can be cut with a breadknife, though a long-bladed jigsaw and proper template might satisfy those more perfectionist than me.
Just lift the eke, insulation and roof as one to see inside.
Re the roof. Measure the thickness for yourself and compare it to the wall thickness.
Same material, more thickness = more insulation.
Where is the most effective place to put insulation in a house? (Heat rises!) Yet the nuc roof is less well insulated than its walls!
And I've found the pic that I remembered was on the forum somewhere …
Take a look at
http://www.beekeepingforum.co.uk/showthread.php?p=351838&highlight=condensation+roof#post351838 though I personally find the insulation eke to be a less-fuss less-carpentry-skills (and so more appropriate to me) solution.
// And I've myself seen more condensation than that. It is well-reported by others on this forum as well.
/// Also note that, until they redesigned their poly national roof (fattening it, apart from anything else), condensation on the *hive* coversheet was also regularly reported. The fix is similar, Celotex cut to fit inside a super … and its no harm even if you have the new version of the roof.