Boarding over lath and plaster ceiling

[ladwey]

I need to overboard a ceiling for plasterboard. The existing ceiling is old lath and plaster and pretty cracked. Do I need to get the old ceiling down first or can I just find the joists and screw the new boards to them over the top? Thanks!

 

[Wayners]

Pulling down a ceiling is one hell of a mess which is why many overboard.
So much dust!
Probably need a skip as well.
Sometime it's better to pull a ceiling down.
Add more timber.
Level ceiling if needed.
Sort wiring and plumbing.
Use insulated plasterboard if you want.
Not so much weight being supported.

So depends.

 

[ladwey]

Already got the electrics and plumbing sorted and there's no need to level it. The only thing I'm worried about is the plaster failing over time and pushing down on the new boards.

 

[Wayners]

Use 12.5mm board.
Be fine.
Won't fall.
I've done loads and no problems

If it was mine.
After over boarding.
id vacuum off the other side if I could get access and PVA.
It binds it together.

 

[ladwey]

Thank you!

 

[opps]

Already got the electrics and plumbing sorted and there's no need to level it. The only thing I'm worried about is the plaster failing over time and pushing down on the new boards.

The plasterboard will hold up the lath and plaster. Over the years I have had a few customers who became fed up will lath and plaster ceilings committing suicide.

Down sides? finding a way of marrying up the plasterboard with the cornice/coving. In the older houses the cornice was run in situ. Often they stop the plasterboard short of the cornice and use an end bead. Large plaster ceiling roses might need to be replaced.