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Mooncat
Senior Member
Joined: 23 Dec 2007
Posts: 1718
Location: Wales-UK
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 Posted: Sat Jul 19, 2008 9:49 pm Post subject: Saggy plasterboard |
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How do you stop plasterboard sagging between joists when using pink skim? Two of my ceilings show this (done by pro plasterers), it's not too bad except if you use a low-profile light fitting.
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misterk
Junior Member
Joined: 24 Mar 2006
Posts: 29
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| Posted: Sun Jul 20, 2008 10:47 am Post subject: |
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Was the correct thickness plasterboard used?
12mm is best on ceilings to prevent sagging. |
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Mooncat
Senior Member
Joined: 23 Dec 2007
Posts: 1718
Location: Wales-UK
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| Posted: Sun Jul 20, 2008 10:38 pm Post subject: |
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I suspect that both ceilings are 9.5mm. I've come to realise that the thicker sheets are worth the small extra money.
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ultimatehandyman
Site Admin
Joined: 16 Jul 2005
Posts: 9287
Location: Darwen, Lancashire
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| Posted: Mon Jul 21, 2008 5:19 am Post subject: |
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I don't think there is anything you can do apart from overboard them with 12mm or rip it down and start again, or you could have it artexed- some patterns might hide it a little.
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Hoovie
Devon DIYer
Joined: 27 Jul 2007
Posts: 7776
Location: East Devon
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| Posted: Mon Jul 21, 2008 8:35 am Post subject: |
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if you have easy access from above, could you fit noggins at various places between the joints and then screw into those from below to give the extra support?
Not sure if that would end up being more work then is worth it?
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Mooncat
Senior Member
Joined: 23 Dec 2007
Posts: 1718
Location: Wales-UK
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| Posted: Mon Jul 21, 2008 8:53 pm Post subject: |
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I've decided to take the old plasterboard down (3 sheets) and put on some 12mm stuff. After laying out so much on the bathroom, it seems a shame to spoil it with a patched up repair in a few places. Some of the joists need adjusting anyway, been there nearly 50 years. Is there any real point in fixing polythene sheet first, then poking loads of holes in it with screws.
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fin
Senior Member
Joined: 16 Apr 2008
Posts: 264
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| Posted: Tue Jul 22, 2008 7:46 pm Post subject: |
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u need a vapour barrier in the bathroom really these days for building regs iirc. (sure they made us put one up last time though seems daft when it gets holes pocked in it i agree)
weve never had problems with sagging 9.5mm base boards before either. have you got large centres for the joists or something? |
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nearnwales
Junior Member
Joined: 13 May 2006
Posts: 13
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| Posted: Wed Jul 23, 2008 7:54 pm Post subject: |
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| sounds like they plaster boarded it with the joists and not againts them |
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Mooncat
Senior Member
Joined: 23 Dec 2007
Posts: 1718
Location: Wales-UK
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| Posted: Tue Jul 29, 2008 3:42 pm Post subject: |
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Just got back home from the Midlands. The ceiling joists aren't as fair as they could be, makes the ceiling look saggy. Will get on with it this week, when Mrs M allows me the time.
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