New Plasterboard and Plastering over existing wet joists

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Hi

I would like to know what is best / normal practice for the following scenario.

A leaking flat roof of over 5 years + with water and damp penetriting interior ceiling.

Roof been re-felted and new insulation 75mm thich installed. The exisiting joists are wet. Some have been replaced.

I have been advised that we take the whole internal ceiling down. ( I agree ) and new plasterboard and plaster. I mentioned do they not need to dry out the joists first. I was informed they would dry out in time and it wouldn't matter.

My concern is if putting new pboard on wet joist then the damp will transfer into the p/board and new plaster and any paint that will be applied.

Logic tells me they should dry the joists first (Maybe with a de-humidifier assisting.)

Hope this is the right forum for this.

Thanks
 
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I wouldn't put any type of new plasterboard onto joists, that have had 5 years of being wet. Let them dry out first. Use the de-humidifier,, or let the fresh air/draught into the building to assist drying.
 
i may be wrong but if the joists are wet and damp they are going to shrink when they dry out and may crack the new ceiling
 
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More to the point here lads, the fixings will prob rot away in the joists as they dry out. Sneeze near a drywall screw and leave it for any amount of time and it will rust.
 
Guys Thanks for the thoughts. You've flagged up some isdue i hadn't thpught of.

This is a great forum for hints tips snd advice

Keep it up
 
Pull down the ceiling and let the joists dry out, I doubt they will all be wet, it shouldn't take too long, now it's all in the dry.
 

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