Finding beams in garage ceiling?

Want to hang a bike rack....
Whats best way to find out where the beams are underneath the artexed ceiling. Apart from the obvious of guessing by seeing how hollow it sounds when i hit it with a broom handle and then drilling a hole.
Are the beams likely to run across the garage or up/down?
BTW- theres a bedroom above the garage if that makes any difference....
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On Thu, 24 Mar 2011 13:35:33 -0700 (PDT), paulfoel

Use a metal detector to try and find rows of nails.
--
Frank Erskine

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On 24/03/2011 20:35, paulfoel wrote:

Which way do the bedroom floorboards run? The joists will be at right angles to these - and you can tell where they are from the rows of nails. With a bit of careful measuring you can then work out where the joists are relative to the garage ceiling.
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Cheers,
Roger
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On 24/03/2011 20:35, paulfoel wrote:

Either a stud detector - can work well if the PB is not foil backed. Or a strong magnet (to find the fixings), or a metal detector.

Yup!
Floorboards? If so the joists run perpendicular to them. (even with sheet flooring its usually 8x2' and the 8' length will be across the beams)
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Cheers,

John.

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Just tap it with your knuckles, run back and forth over it and you'll work it out. Spacing is usually 16", sometimes 2'.
NT
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On 24/03/2011 20:35, paulfoel wrote:

Have they skimmed the garage ceiling ? Very posh!
On mine you can see the lines of nails/pins holding the plasterboard to the beams.
And, for what it's worth, they run across the width of the garage.
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On 24/03/2011 20:35, paulfoel wrote:

More likely to be across the width, but can't guarantee it.
If knocking doesn't work, and presumably you haven't got a stud detector or you wouldn't be asking the question, the esiest was would be just to drill test holes with your smallest drill to locate the beam - after all it's a *garage* ceiling, not your living room; and it's got Artex on which will conceal the holes (which could be completely hidden by bunging a bit of filler in).
David
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