Loft insulation - mixed material

2 Aug 2008
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United Kingdom
Going to re-insulate my loft shortly and wanted to make sure there aren't any major issues with my plan . . .

Roof joists are 100mm deep and about 40% of the loft will be boarded for storage. I intend to insulate under the boarded area (between the joists) with 100mm Kingspan tp10 or similar which gives me a u value of about
0.23 and lay some insulated loft boards across the joists to beef it up near to 0.16

The other 60% of the loft, I'm going to cover with 100mm Thermafleece batts between the joists and another 100mm wool roll across the joists. This gives me a u value of about 0.19. Can't really afford another layer but it's close enough to 0.16 to not make a great deal of difference.

Does this all sound OK? I really don't want Brutish Gas or death-wool anywhere near my loft.
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i'm insulating my loft/attic now too. Got the windows install two weeks ago so it going to be a proper room eventually. I'm also using the Kingspan tp10. Have you begun to install it yet? Its really easy to use as long as your joists are uniform, otherwise theres a lot of shaving and resizing.

My joists differ in about 20-30mil one to the next and 5mil top to bottom. im a complete novice at this but its going well. If you've never used the kingspan before, the best thing to use is a jigsaw to cut the insulation. Also, if your going to board some of it, you may aswell go the whole lot. You'll end up doing it later I think anyway.

I'll let you know how I got on.

Good luck with yours!

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