Ceiling requiring re-boarding

[pate_luv]

I have a ceiling that is no longer flat and/or well attached to the joists above. Should i remove all current plasterboard (dislodging all granular insulation from above, requiring costly replacement) or can i just attach new boards through the old ones then skim over?

 

[Mr Fix It]

you can just overboard and then skim over it, no problem.

 

[pate_luv]

will this be strong enough to pull the existing sagging plasterboard back up into place. Are there special screws/nails that i can use to prevent them just punching throught the new board (i.e. force on the board from above could push the board over a small headed nail)

 

[joe-90]

If your plasterboard is sagging then you've got a problem in the loft. The insulation is too heavy for the board or it may have got soggy from a leak. Either way something is not right.

 

[pate_luv]

yeh i believe it has got wet in the past but it has dried out fully now.

 

[joe-90]

I think you'll have to replace the bowed section. If it then looks OK you can simply skim the lot. No need to board twice if it is OK-ish.

 

[dirtmatt]

We're also looking at overboarding an existing ceiling. We've had a plasterer around who said he would attach new plaster board using something called Slate Lat (I think this is what he said). He said it would secure the new plaster board much better than just hoping that the screws go into the joists. Does anyone know anything about this technique?

Cheers

Matt

 

[noseall]

yeh i believe it has got wet in the past but it has dried out fully now.

plasterboards that have been wet, have subsequently sagged, can dry out in a sagged state.

these sagged boards can be very difficult to press back into their original state.

if this is the case, i might be inclined to bite the bullet and remove before replacing.