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Looking for a shallow plastic back box

  • 16-05-2021 1:56pm
    #1
    Skylinehead
    Registered Users, Registered Users 2 Posts: 11,690 ✭✭✭✭


    I need to replace a back box with stripped threads, it's 15 or 16mm deep. I could fit a 25mm box in, but they seem to be exceedingly hard to find.

    35mm is too deep for the wall thickness.

    I'd be very hesitant to fit a metal box as it's an old house without grounding for switches.

    I found this: https://pewl.ie/mita%20-%20mounting%20box%20-%201%20gang%20-%2025%20mm

    But it's hard to say how that's mounted, doesn't seem to have screws at the back. Anywhere else to try? Woodies, Screwfix, B&Q, Homebase only seem to have 35mm or 47mm boxes.


Comments

  • #2
    Cerveza
    Closed Accounts Posts: 424 ✭✭Cerveza


    Why don’t you drill a 5.5mm hole with masonry bit at the damaged thread and pop in a rawl plug. You will have to use a longer 3.5 socket screw but readily available.


  • #3
    GreeBo
    Registered Users, Registered Users 2 Posts: 27,370 ✭✭✭✭GreeBo


    You could just use a 25mmb plastic surface box, they are pretty common, Screwfix have them for 50c or so.

    9474D_P&$prodImageMedium$


  • #4
    GreeBo
    Registered Users, Registered Users 2 Posts: 27,370 ✭✭✭✭GreeBo


    The one you linked is for use with trunking, they just snap in.


  • #5
    Skylinehead
    Registered Users, Registered Users 2 Posts: 11,690 ✭✭✭✭Skylinehead


    Cerveza wrote: »
    Why don’t you drill a 5.5mm hole with masonry bit at the damaged thread and pop in a rawl plug. You will have to use a longer 3.5 socket screw but readily available.

    That might be an option now that I'm looking at it...I'll try it anyway and see how it goes.
    GreeBo wrote: »
    You could just use a 25mmb plastic surface box, they are pretty common, Screwfix have them for 50c or so.

    9474D_P&$prodImageMedium$
    Yeah if I can't find a 25mm or smaller box (the current one as I say is 15mm but they don't seem to exist any more) that's what I'm going to have to do.
    GreeBo wrote: »
    The one you linked is for use with trunking, they just snap in.

    Aye I was worried about something like that. Might be able to retrofit it with a few holes, but it's not ideal.


  • #6
    Cerveza
    Closed Accounts Posts: 424 ✭✭Cerveza


    The one suggested is a surface box. You would need to do alterations to get to fit. Is it a block wall?


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  • #7
    Skylinehead
    Registered Users, Registered Users 2 Posts: 11,690 ✭✭✭✭Skylinehead


    Cerveza wrote: »
    The one suggested is a surface box. You would need to do alterations to get to fit. Is it a block wall?

    Internal brick, I'd need to put a bit of timber and plaster in the cavity for the switch box, but it's not too big a job.


  • #8
    Skylinehead
    Registered Users, Registered Users 2 Posts: 11,690 ✭✭✭✭Skylinehead


    Cerveza wrote: »
    Why don’t you drill a 5.5mm hole with masonry bit at the damaged thread and pop in a rawl plug. You will have to use a longer 3.5 socket screw but readily available.

    I think this is going to work, it's not perfect due to the top of the rawl plug protruding a little, but I can hide that behind the switch plate. Thanks for the excellent suggestion.


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