Drywall screws into ceiling - 50mm or 60mm

4 Jul 2020
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United Kingdom
Well the ceilings have been dropped so they won't be overboarded - what size drywall screws should be sufficient just to attach the plasterboard into the floor joists.

Would 40,50, 60mm ?

I think 60mm would be overkill?
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Unless you have any pipes or cables passing low down through the joist why not use 60mm, the joist will be at least 100mm even in a top floor celling.
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I have got to put 12.5 mm plasterboard up over 25 mm celotex what length screws should I be using?

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