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Green Building Bible, Fourth Edition
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    • CommentAuthorCWatters
    • CommentTimeFeb 20th 2012
    Is it possible to fill a 75mm cavity that already has 25mm of EPS in it?

    Are there any companies known to do this and provide a warranty?

    I'm asking for this poster..

    There have been a few discussions which have touched on this. Not sure where though, I'll have a think on it.

    I think though that the answer is that you won't get a warranty due to the uncertainty of any existing insulation and its condition. You probably won't get building regs approval either as they will want BBA or similar certification, and I don't think there are any products out there specifically offering this.
    • CommentAuthortony
    • CommentTimeFeb 20th 2012
    I would do it with polystyrene beads unhesitatingly
    How about refilling cavity wall , when a job appears to have been badly done ?
    knocking a few hole through here and there on a job has shown CWI to be very patchy and further investigation shows very few drill holes used.
    Any thoughts
    • CommentTimeFeb 20th 2012
    Posted By: tonyI would do it with polystyrene beads unhesitatingly

    Even if PVC cable is in the cavity?
    • CommentTimeFeb 20th 2012
    Indeed, or hot flues crossing the cavity... Not that I know anything.


    • CommentAuthorgcar90
    • CommentTimeFeb 20th 2012
    So how on earth would anyone get a top-up after say, remedial work/alterations where whole cavities are just full of air?
    • CommentAuthorjms452
    • CommentTimeFeb 21st 2012
    Few thoughts:

    Look at p34 and p35 of Approved doc C which deals with damp ingress by geography:
    If this says full fill is a no go because of driving rain then there is probably a good reason for the cavity.

    If not then other than cables in the cavity I think that you're intro burocratic technicalities (CWI installers are used to dealing with flues etc.). An anonymous chat with your local BCO to find what his thoughts are is worth a punt. Platinum beads should bring you up to building regs and normal might depending on your construction so he might be willing to sign off?

    Either way on point 2 I'd imagine that the guarantee and the subsidy eligibility criteria would be the sticking points. If you speak to polybead installers and are clear that you don't need a guarantee and will pay the unsubsidised price you might get lucky... You should be able to determine this over the phone if you can speak to the surveyor them-self. You might also find one of the smaller CWI companies is willing to cut you more slack.

    As a last shot there is the polyurethane injection guys who I don't think have a BBA cert although mixing polymeric insulation types is probably a bad idea.

    Hope this helps

    • CommentTimeFeb 21st 2012
    http://www.diamondbead.co.uk routinely remove old CWI before installing new - easy apparently. Tho I am against CWI - poor half measure that will have to be removed one day as part of doing insulation/massiveness properly.
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