Loft insulation - kingspan

[Lirwraith]

Hi,

I'm hoping that someone can give me some sensible advice. It's starting to get cold and my roof is woefully uninsulated. However, we use it for storage and i'm keen to avoid filling the roof with rockwool. The floor is currently boarded and has no more than 100mm of rockwool stuffed underneath the boards.

I have found a supplier of seconds kingspan boards (1.2x0.6m - so they fit in the loft) and 110mm thick. The boards do not have a foil coating. I was thinking of tiling these across the boarded floor and just storing the stuff on top.

In practical terms, i'm not worried about walking on these boards so I wouldn't both to cover them up. While we store stuff up in the loft, we don't go up there very often.

So:

1. is there any reason that these boards would not be suitable? (flammability?) If so, is there any solution to this (covering them up?)

2. is this enough insulation?

3. have I missed anything or are there any better suggestions?

All help gratefully received!

Dan

 

[tony1851]

The kingspan is very roughly twice the efficiency in insulation terms as the fibreglass. So you would have the equivalent of about 300mm fibreglass up there.
If you don't go up there too often, can't see a problem with treading on it.