Idea on marking lights

Myles · Jan 16, 2019

So I was thinking of investing in one of those lasers with a plumb bob after using a colleagues on a recent job - very helpful.

I’m now doing a job where I have to wire downlights where it’s a really high ceiling (so cables banded and hanging awaiting dropped pb ceiling)

I was thinking of marking the lights on the concrete floor, using plumb bob to give ceiling position and then drilling a shallow 5.5 hole into the floor exactly on the plumb line to use later at 2nd fix to cut holes out, using the plumb bob laser.

Anyone else done this? I’m a bit concerned the holes may get covered in dust etc, but it would save having to mark out twice!

SparkyChick · Jan 16, 2019

Instead of drilling a hole, put in a short screw

SparkyChick · Jan 16, 2019

Ahhh... just re-read... concrete

What about drill the hole, blow it out and fill it with some silicone?

Myles · Jan 16, 2019

Actually a short screw is not a bad shout! Bang a red plug in and leave the screw head sticking up a couple of mill...then remove after the hole is cut above

SparkyChick · Jan 16, 2019

In today's litigious society I would avoid leave anything sticking out the floor in case someone catches their foot on it and takes a tumble.

If you go down that route, get yourself some small diameter screws with heads smaller than the plug. They should still bite into the plug enough for you to be able to remove them afterwards but you should be able to screw the head down into the plug itself so it's flush with the floor.

Obviously also be mindful of underfloor heating if it's present

Myles · Jan 16, 2019

Yeah h&s can’t cope with a trailing 110 yet alone a screw sticking up

I might put some gaffer tape down, drill though then put a screw in with a penny washer to hold down the gaffer tape for quick visual later. There are 80ish flats to do so want to find a good system from the off