New roof insulation?
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  1. #1
    Off the Xmas card list kapri's Avatar
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    New roof insulation?

    Our attached next door neighbour is about to have her felt and battens replaced on her roof . It was a bungalow but has front and rear single dormers and a hip far roof.

    She has absolutely no insulation under there at the mo.

    One bloke has looked and is talking about using Kingspor sheet insulation but obviously has to leave an air gap so it'll only be about 2" thick.

    When we had our dormers done we had problems with headroom and the building inspector said we could use " space blanket " which is like an aluminium foil duvet and takes up little space. Would this be better to use in this refurb for best insulation as the sheet insulation on ourd was going to be about 6" thick?

    Any pointers please?

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    Official RnS Addict 296moon's Avatar
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    Kingspan or same as, thick as you can................from exp

  4. #3
    Off the Xmas card list kapri's Avatar
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    Modern spec is 6" of Kingspan with 2" airgap, bit of a problem when your roof joists are only 4" .

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    Official RnS Addict 28Chevy's Avatar
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    Those multilayer foil type caused a lot of argy bargy a few years ago, and claims were widely discredited, all a bit of a scam really. Manufacturers of other types weren't whiter than white with their claims either.

    https://assets.publishing.service.go...ular062009.pdf

    I never believed the claims before that and wouldn't use it when i was contracting, even though it was being used everywhere on Grand Designs programs.
    Whirrr whirrr chuff chuff de chuff........chuff......BRUMMMM!

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    Official RnS Addict 28Chevy's Avatar
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    Last loft conversions I did BC reduced the minimum requirement a little due to existing 4" rafters, 2" kingspan type between with air gap above and 1/2" kingspan then plasterboard underneath that to prevent cold bridging via the rafters. Just managed to get min head height at top of stairs by using a narrower stair that moved the C/L over a couple of inches.

    edit, it may have been 1" underneath I cant rightly recall now.

    Talk to B/C they are usually very helpful, and respond well if you treat them like humans.
    Last edited by 28Chevy; 26-07-2020 at 09:06.
    Whirrr whirrr chuff chuff de chuff........chuff......BRUMMMM!

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    Official RnS Addict 28Chevy's Avatar
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    Last edited by 28Chevy; 26-07-2020 at 09:03.
    Whirrr whirrr chuff chuff de chuff........chuff......BRUMMMM!

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  9. #7
    Off the Xmas card list kapri's Avatar
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    When we did mine BC allowed us to use the multifoil instead of Kingspan in one area of the roof to maintain headroom . Likewise had to make a Landing one step doen to meet Building regs min headroom.

    i used to use an off cut of multifoil to lie on under the car on concrete floor, was really toasty even on damp concrete.

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    Off the Xmas card list kapri's Avatar
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    If I explain a bit further . Neighbour is single mum who is potless . Just inherited some money and wants to do the best she can with what she has available . This means internal ceiling have to stay where they are and additional ( ANY!!) insulation has to go from ceiling outwards .

    I'm led to understand that the multi foil is best used on top of the rafters rather than inbetween and wrap over?

    Apparently if she rerooves more than 25% she MUST meet modern specs ? I'm guessing that is 25% of tiles rather than 25% of felt and battens ??
    Last edited by kapri; 26-07-2020 at 09:44.

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    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by kapri View Post
    If I explain a bit further . Neighbour is single mum who is potless . Just inherited some money and wants to do the best she can with what she has available . This means internal ceiling have to stay where they are and additional ( ANY!!) insulation has to go from ceiling outwards .

    I'm led to understand that the multi foil is best used on top of the rafters rather than inbetween and wrap over?

    Apparently if she rerooves more than 25% she MUST meet modern specs ? I'm guessing that is 25% of tiles rather than 25% of felt and battens ??
    if that's the case kev get 25% done and dusted then another 25% then..... you get the idea. skirt round the modern regs that way maybe?
    neil.
    need a job done on your project? i may be able to help.

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