Hi.
Anyone ever used superquilt on top of rafters ,i am trying to get a comparison with p.i.r. board.
Clive.
Anyone ever used superquilt on top of rafters ,i am trying to get a comparison with p.i.r. board.
Clive.
Edit: When we have our roof replaced I am seriously considering using superquilt over rafters.
absolutely agree Kev, I do exactly that on roof insulation with PIR plasterboard over it to prevent bridging. I haven't used superquilt over the rafters yet though. You can lay it under or over rafters.Hi mike,
A properly done celotex job inbetween the rafters, with expanding foam to any gaps, even small ones, then foil tape across all timber joints and butt joints will work wonders.... but the key is to take the time to make sure its dont properly. Some people undercut the edges to get it in easier, but basically reduce the insulation value by doing so
Yeah but presumably people are doing cold roofs because they have to, not because they think it's better than a warm roof design. But I think the point you are making is to use PIR if you have to go cold roof, which I totally agree with.Thermal performance of PIR board is about twice that of glass wool quilt so th achieve the same insulation value you only need half teh thickness, One issue with insulating between rafters is that the rafters act as thermal bridges through the insulation and significantly reduce the insulation performance
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