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Question about rafters for a punchbag

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BigPete
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2009/07/30 21:56:54 (permalink)
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Question about rafters for a punchbag

Had a bit of an explore in my garage, I found beams but I thought they'd be bigger.  They are approx 3cm tall and 4cm wide.  The garage is an integral part of the house, and the plasterboard is 4cm thick which I assume is maybe for fire regs and/or insulation? 

I'd been looking to hang a punchbag but not sure if these are strong enough?  Could it be a cross beam of somesort or possibly the rafter itself?
post edited by BigPete - 2009/07/30 21:58:31
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    dazc
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    Re:Question about rafters for a punchbag 2009/07/30 21:59:07 (permalink)
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    if its integral, is there a floor above it?

    they cant be the floor/ceiling joists, they must be batten for the plaster board.  whats above them?  wood, concrete? 
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    BigPete
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    Re:Question about rafters for a punchbag 2009/07/30 22:00:22 (permalink)
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    Yeah, thats more likely.  There is a bedroom directly above, so its part of the house still.
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    BigPete
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    Re:Question about rafters for a punchbag 2009/07/30 22:02:29 (permalink)
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    I've only got a small hole at moment to look through.  Theres a good gap until you reach the floor above.


    I haven't lifted carpet in the room above yet cos I have done in another room and rather than floorboards it seemed to be large sheets of board put down, so I can't tell which way they run.
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    dazc
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    Re:Question about rafters for a punchbag 2009/07/30 22:04:35 (permalink)
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    BigPete

    I've only got a small hole at moment to look through.  Theres a good gap until you reach the floor above.


    I haven't lifted carpet in the room above yet cos I have done in another room and rather than floorboards it seemed to be large sheets of board put down, so I can't tell which way they run.


    they are just chipboard floors mate, if you lift enough carpet you will see a board thats 600x2400, will still run accross the joists.
     
    the garage must have been counter battened for some reason before it was boarded, so somewhere there will be a floor joist running the other way
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    BigPete
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    Re:Question about rafters for a punchbag 2009/07/30 22:10:02 (permalink)
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    Ok that starts to make sense.

    This used to be a showhouse so in the double garage was a sales office, and they had put in false walls and I guess a false ceiling as well, cos when we moved in it was all stripped back to the plasterboard again. 

     Maybe the ceiling was lowered for that, or maybe that is just the way they do these houses.


    I had enough trouble getting the batten, the lines I followed to see where the nails where going in seem to miss the baten half the time.


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    dazc
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    Re:Question about rafters for a punchbag 2009/07/30 22:19:21 (permalink)
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    lol, sounds about right

    ok, so if you get something thin, but flexible-ish, and push it up through the hole parallel with the batten, it will stop when it gets to a joist.  at most they will be 600mm centres, so it cant be more than that in either direction!  use the stick so you know how far away the joist is and where to make the next hole!
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    BigPete
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    Re:Question about rafters for a punchbag 2009/07/30 23:26:40 (permalink)
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    Thanks dazc, you've been most helpful.

    One final question - the ceiling is about 4cm thick and looks like 3 bits of board stuck together.  Is this thickness primarily for insulation or fire protection or both?
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    dazc
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    Re:Question about rafters for a punchbag 2009/07/30 23:40:07 (permalink)
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    BigPete

    Thanks dazc, you've been most helpful.

    One final question - the ceiling is about 4cm thick and looks like 3 bits of board stuck together.  Is this thickness primarily for insulation or fire protection or both?


    its for fire protection mate, garage to house has to have an hours resistance to penetration from fire
    #9
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