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Ceiling mount for PJ - finding wood?

Discussion in 'Home Cinema Building DIY' started by Maximum Bob, Nov 30, 2004.

  1. Maximum Bob

    Maximum Bob
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    PJ celing mounts make me nervous, just cos' I never done it before - I can see me making a nice plaster hole!

    Any tips on how to find where the wooden joist is behind the plaster? to make sure I screw into the right place.
     
  2. Leigh_1973

    Leigh_1973
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    Get one of those electronic stud finders :)
     
  3. john59

    john59
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    Easier and cheaper method is simply tap with your knuckle on the plaster and when your hear a duller noise that is where the joist should be. (trust me I'm a plasterer)
     
  4. MikeRJ

    MikeRJ
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    Always worked for me. Getting the exact center of the joist takes a practised ear though! (trust me, I'm often plastered :D).
     
  5. AMc

    AMc
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    As your mount will cover a multitude of DIY sins...
    Find the joist by tapping - it will run at right angles to the floorboards in the room above.
    Mark your joist position and then narrow it down further using a small drill bit.
    Drill 4-5cm deep holes in a line across the joist. If the bit goes in a couple of centimetres and 'pops' through then you're in plasterboard. If the bit goes in and bites for several centimetres, kicking out sawdust then you're in the joist. A couple more little holes and you will have found the centre and you can make the hole a bit bigger to accomodate the mounting screws.
     

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