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Warmboarding a dormer roof

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  • 08-06-2023 5:02pm
    #1
    Curiousness99
    Registered Users Posts: 191 ✭✭


    I removed 30plus downlighters from the upstairs of our house, it's a dormer and some of the downlighters are into the apex of the dormer.


    Initial plan was to fill the holes to stop the drafts and improve air tightness


    It turns out the insulation (rock wool) above ceiling height is patchy, I assume the electrician who fitted the downlighters moved it so its pretty much non existant in places.


    Anyway now I am thinking I should warmboard the entire roof upstairs with 50mm PIR insulated plasterboard

    It's a big job and there are some vaulted roof areas so it's gonna be costly (still waiting for quotes)


    We've got a couple of other upgrades (insulation in the accessibilble attic areas) , cavity walls pumped and new windows being fitted shortly and the roof areas into the dormer feel like the weak spot.


    Assuming I've the money left to pay for it, what are peoples views ad to it's effectiveness?


    Should I just plug the holes were the downlighters were or go for the far more costly warmboarding approach?


    Any advice based of experience or knowledge would be appreciated?


    P.s. if warmboarding, we'd also get the internal walls done that face into attic voids

    Would most likely do window reveals with aerogel while I'm at it.



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