Loft Insulation - multifoil or rigid board??

7 Nov 2006
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United Kingdom
Hours spend searching the intranet and just found this site ... :)

I'm converting my loft and have got to the thorny issue of how to insulate the external walls (37 degree pitched, 100mm rafters, plain concrete tiled) and flat roof (200mm joists, 18mm plywood, fibreglass layer)

Do i go for
1 between and over rafter rigid board insulation with plasterbaord
2 between rafter insualtion with insualted plasterboard
3 multifoil overrafter insualtion with plasterbaord on counter battens

Advice / recommendations appreciated - or link to previous threads if i have missed previous discusiosn / debate.
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