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Old 13.09.2011, 16:02
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Drilling in ceiling for beamer / projector

So i've drilled in the ceiling before for lights etc and no problem. Now I just bought a projector and want to mount it in the ceiling. I've also just bought a Bosch sensor gadget that tells me if there is electricity or metal behind the wall / ceiling. Should indicate pipes and so forth. Problem is, I just ran that over the ceiling and practically the whole thing has metal behind it (not electricity though).

I suspect that it can't all be pipes? I mean we are talking the whole ceiling in a large room. I have to make two holes of 7cm / 3 inches. I don't want to have a flood from above. I wonder if I need to get a different sensor tool (for water?) or does anyone know if the ceiling is likely to be thick enough that I can drill into it 7cm?

I'm sure plenty of people have done this before. Any suggestions?

Thanks
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Old 13.09.2011, 16:10
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Re: Drilling in ceiling for beamer / projector

So far I can remember, ceilings are made of concrete which has rebar's for strengthen the ceiling. Hit or miss ;-) ... Good luck!
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Old 13.09.2011, 16:10
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Re: Drilling in ceiling for beamer / projector

re-enforced concrete is likely what it is. What's upstairs?
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Old 13.09.2011, 16:13
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Re: Drilling in ceiling for beamer / projector

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re-enforced concrete is likely what it is. What's upstairs?
Indoor pool.
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Old 13.09.2011, 16:16
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Re: Drilling in ceiling for beamer / projector

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Indoor pool.
lol

Anyway, what'll be funny is if you have a proper hammer drill and a decent bit. Otherwise you'll curse a little during your drilling.

All-in-all, I'm guessing your ceiling is the floor of upstairs' apartment and you'll have to go a long way beyond your 7cm to get their underfloor heading.....unless their layout has their sitting facility above your head
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Old 13.09.2011, 16:23
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Re: Drilling in ceiling for beamer / projector

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So i've drilled in the ceiling before for lights etc and no problem. Now I just bought a projector and want to mount it in the ceiling. I've also just bought a Bosch sensor gadget that tells me if there is electricity or metal behind the wall / ceiling. Should indicate pipes and so forth. Problem is, I just ran that over the ceiling and practically the whole thing has metal behind it (not electricity though).

I suspect that it can't all be pipes? I mean we are talking the whole ceiling in a large room. I have to make two holes of 7cm / 3 inches. I don't want to have a flood from above. I wonder if I need to get a different sensor tool (for water?) or does anyone know if the ceiling is likely to be thick enough that I can drill into it 7cm?

I'm sure plenty of people have done this before. Any suggestions?

Thanks
The device I suspect you've got will detect steel rebar with moderate accuracy and live wires with generally poor accuracy. Most of that type will not detect copper or plastic so will not detect water pipes (which are usually one or the other of these) at all.

However you will not normally find water pipes on the underside of a floor slab. Just rebar or electrical conduit. Of course hitting a live wire isn't the best thing to do either.

If you're really concerned, the Bosch professional range has a radar based detection tool that will find most things with better accuracy. But you pay for that.
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Old 13.09.2011, 16:56
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Re: Drilling in ceiling for beamer / projector

Neigbour's appartment is upstairs. The device I have is a sensor (recommended by the guy at Bau Hobby) and it is seems very good with electricity detection. I'll be turning off the electricity from the mains to avoid finding out i'm wrong anyway! I'm only really concerned about hitting water pipes and given the amount of metal it must be the mesh stuff (point taken about plastic pipes, think my sensor also detects copper if I recall correctly).

Thanks KB88111 & baboon about the water pipes / distance comment. I'm 99% sure their bathrooms are above ours (can hear the water when they run a tap). I have a proper hammer drill and concrete bit - I put up a flat screen on the wall last week.

Cheers and any more tips i'm grateful. Will put it up after work tonight.

Thanks
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Old 13.09.2011, 17:38
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Re: Drilling in ceiling for beamer / projector

does your drill have two handles? Because your wall is a different kettle of fish to the ceiling, trust me


Oh and tell the upstairs neighbours what you're doing. They will notice the noise.
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Old 13.09.2011, 17:47
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Re: Drilling in ceiling for beamer / projector

It's a bit late now, but it might be a good idea to employ an electrician to drill the holes, if he makes the mistake he can fix it. And ceiling cement is very hard!
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Old 13.09.2011, 22:58
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Re: Drilling in ceiling for beamer / projector

Went to the blue and yellow furniture place tonight instead, so tomorrow night. Yes, it has double handles - i've borrowed it from one of our building manager's at work, so it is proper decent. Funnily, he said he never used it. I'm going to do this myself and not do with an electrician. I'm guessing an electrician will charge me 100 chuffs to do what I will do in 1 minute. I've drilled and put in plenty of lights as well as the aforementioned screen on the wall. I might have to advertise my services after this..

Cheers all, will let you know how I got on... the only thing I am thinking about is how to do the filling in when I go, but that is for later..
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Old 13.09.2011, 23:15
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Re: Drilling in ceiling for beamer / projector

I made a 4cm hole in the ceiling and it was tough work for the last 2 cm. Was not a hammer drill though. I hate drilling due to the fear factor of hitting something. I made in total around 200 holes all over the flat recently.
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Old 14.09.2011, 00:39
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Re: Drilling in ceiling for beamer / projector

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Cheers all, will let you know how I got on... the only thing I am thinking about is how to do the filling in when I go, but that is for later..
Hiring a professional means they have to worry about the liability insurance, so I hope you have that in place.

I would knock on your neighbour's door before you begin, take a bottle of wine, and apologize in advance for the planned disturbance.
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Old 14.09.2011, 12:40
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Re: Drilling in ceiling for beamer / projector

Wine & apologies delivered in advance as per your suggestion. Neighbour pleasantly surprised and has given her blessing. Thanks for the reminder!

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Old 14.09.2011, 13:30
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Re: Drilling in ceiling for beamer / projector

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Wine & apologies delivered in advance as per your suggestion. Neighbour pleasantly surprised and has given her blessing. Thanks for the reminder!

Hope you didn't get them out of the pool!
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Old 14.09.2011, 23:47
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Re: Drilling in ceiling for beamer / projector

Success...

Thanks all, maybe we can share a bottle of wine and watch a movie!
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Old 14.09.2011, 23:51
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Re: Drilling in ceiling for beamer / projector

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Success...

Thanks all, maybe we can share a bottle of wine and watch a movie!
Did you get it in????????????????
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