I'm thinking of drilling a hole through a 34cm brick wall, to wire an outside lamp. I don't have an SDS drill here (I'm not at home), just a Bosch hammer drill. I only need a small hole for the wire, but I'm not sure if I can get a drill bit that long. I'm wondering if there is any clever way of getting holes from each side to meet?
You probably will, but it may make a simple 1 minute job into a lot of hassle. I wouldnt try drilling 2 holes from both sides, its a recipe for failure.
I'm putting though some white plastic cable channel, putting the cable inside that, then filling in with foam, then scraping away the foam at the outside and putting in cement.
The hole should slope towards the outside so any water goes outwards.
You can, although you might need to go to a 10mm hole
formatting link
be careful which way you drill as if you drill from inside towards out you will get spalling on the brick face with often quite big chunks of brick breaking off as the drill nears the surface.
Do you have cavity wall insulation? If so take care when breaking through the cavity, as the bit will be hot and the insulation may melt and stick to it. Best to let the drill bit cool down for a while before proceeding to drill through the next layer.
My sons house still has an SDS bit sticking out of the wall from when I drilled for a 15mm water pipe for an outside tap. The bit got jammed solid and wouldn't go in further, or come out. Fortunately it's now behind a cupboard!
I'd have thought that it would be at least worth trying to match interior and exterior locations by careful measurement from a nearby door, window or whatever, and then drilling in just over half the thickness from first one side then the other.
If the two holes meet, great; if they don't, then the worst that can happen is that you have to carry on with one of the two holes and block up the other.
and where the cable exits the hole it should go downwards first to avoid rain running down the cable into the hole.
And for completeness satisfy yourself there are no cables or pipes where you intend to drill (says he who put a screw through a central heating pipe last year screwing down creaking floorboards).
I'm going to put up one of Ikea's excellent little outside lights, and this seems to have a pretty good seal on the wall. (I just put one up, using the wire-through-wall of a real electrician.) But I will make the hole run slightly downwards, as that sounds sensible. And I'll try for 10mm rather than 8mm.
I regard that as a matter of luck (good or bad). I bought a Lidl device some time ago which was meant to tell you where the wires were in the wall, but it never seemed to tell me anything.
I actually drilled through a water pipe under a floor-board a couple of years ago, and was amazed how much water came through a tiny hole. I managed to convince myself that it was the fault of the plumber (a friend of mine) for putting the pipe in such a silly place. I think he was quite pleased to see, as he cleared the mess up, what damage an amateur plumber can do.
Fortunately I saw a little dampness round the head of the screw. I drained the system before removing the screw and lifting the board and was amazed how little water had escaped.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.