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Drilling help

  • 06-01-2018 3:52pm
    #1
    GarIT
    Registered Users, Registered Users 2 Posts: 8,671 ✭✭✭


    I'm installing a CCTV system for my mam and need to drill some holes from the outside all the way in through the plasterboard, brick and rendering. I think it's about 25cm. Its similar to what a sky installer would do, I'll need two cables per hole about the same thickness as sky installer would have. I'm looking to rent a drill, what sort of drill do I need and is there anything I should know or look out for?


Comments

  • #2
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    100% you need and SDS drill, you could do the job with the ones that Lidl or Aldi do for little more than the hire costs of a hire shop Hilti SDS drill. Its best to line the whole and if possible start with a smaller whole all the way through so you can then finish with the larger drill from either side to reduce break out.

    Lining the hole is best practice and seals your cavity back up (silicon will do) and makes life far easier pushing the cable through and replacing the cable. See if 1/2 inch qualpex pipe will take your two cables if not use what ever pipe suits I've used 3/4 qualpex for similar work.

    Start off with a 12mm long SDS drill which is the smallest long drill you can probably get and finish with the size you require. You may be able to hire the drill bits. 450mm is a fairly common size for the long ones. If you are new to using and SDS drill or may be drilling above you head or in a awkward position then start off with a much much shorter drill so you have some support from the hole for the long drill when you swap over.

    If you start off with one smaller hole all the way though then you can save if you have to buy your own drill bits as you can then buy a drill of the finished size that only needs to go a bit over half way through from either side, price it out to see which works out best.

    You can of course wack through with a single drill bit and a good SDS drill will tackle your job with no problem.


  • #3
    fiacha
    Registered Users, Registered Users 2 Posts: 794 ✭✭✭fiacha


    Just for reference, this kind of drill will be fine for DIY use. May be better value to buy one as you'll have it forever.

    That one comes with some 150mm bits and you can find a selection of diameters / lengths here. Again, no need to spend on a high quality bit if you are just drilling a couple of holes.

    I'm sure you'd pick up similar priced drills locally.

    It's fairly easy for a powerful SDS drill to get away from you. So if you have any bits of masonry block lying around, I'd try a few test holes in that so you get a feel for it. Saves on having to repair plaster inside the house :)


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