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General: Electrical conduit in Icynene insulated frame and socket airtightness

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    • CommentAuthorShevek
    • CommentTimeJul 12th 2014 edited
     
    How would you recommend we run conduit for electrical cabling in an timber frame loft conversion insulated with Icynene? See attached detail.

    I was thinking a ring circuit in 20 mm flexible PVC conduit connected to the back of the inner frame at socket height and then come through the VCL/plasterboard at each box.

    So how do you go about making an airtight connection between the VCL and the electrical box? (I know the Icyene is providing airtightness but we might as well make a good connection with the VCL given that it's there)
    • CommentAuthortony
    • CommentTimeJul 12th 2014
     
    In Canada they make proprietary polythene boots for this application.

    You could have a thin service void in front of the vapour barrier.
    • CommentAuthorGreenfish
    • CommentTimeJul 13th 2014
     
    Can I suggest 3 possible components that could help:
    a) Tescon Vana tape - sticks well to everything I have tried even on overalls through the washing machine!
    b) Fire stop putty - never dries out so can be removed if cables need to be changed in some way.
    c) Home made grommits from edpm pond liner off cuts, any size or shape you want for a fraction of the cost.

    Can't say exactly what you do with them in your case, but they are good sealing kit, be creative!
    • CommentAuthorEd Davies
    • CommentTimeJul 13th 2014
     
    Sorry, can't open your detail.pdf for some reason.

    Any chance of wrapping the VCL behind the conduit? I realize the construction sequence is likely: conduit, icynene, VCL but I'm wondering if the VCL could be fed behind the conduit and held out of the way somehow while the icynene is sprayed.

    Probably if I could open detail.pdf I'd see that the conduit is behind the studs but the VCL is in front but if not is that worth a thought?
    • CommentAuthorShevek
    • CommentTimeJul 13th 2014 edited
     
    Here's jpg version Ed.

    Posted By: Ed DaviesProbably if I could open detail.pdf I'd see that the conduit is behind the studs but the VCL is in front but if not is that worth a thought?

    Yeap.
    • CommentAuthorShevek
    • CommentTimeJul 13th 2014 edited
     
    Posted By: tonyYou could have a thin service void in front of the vapour barrier.

    This is really the best way to do it isn't it, despite the loss of floor space. 12 mm battens over VCL and then plasterboard. This way things can be attached to the wall without puncturing the VCL too.

    We could probably do it with normal size boxes too, as Ed says, by fitting some VCL behind the boxes before the insulation is sprayed in.

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