Plasterboard fallen apart, help pls

[Raff]

Hi had some plumbers who went to install a new kitchen sink for me but as they removed the old worktop its pulled half the tiles and plasterboard along with it !

They informed me its best to get the water damaged plasterboard fixed.

Here is a picture of my issue :

http://s7.postimg.org/4r9nlw1a3/1_2_use.jpg

I can do basic DIY and wish to give it a go, the pink plaster that has fallen off has left a thin plastic on the back which is weak can I place a small piece of wood in that gap and nail it (there is a wooden back piece there) and perhaps use a pollyfilla or stronger to patch it up ?

any suggestions to fix this would be appreciated, thx.

 

[Simon F]

the picture is not to clear.
is it foil backed plasterboard?

you will probably need to open things up more?
how is the existing board fixed,
dot and dab, screwed to timber frame?

you will need to follow whatever has been done to the existing,
but don't skimp on it, if it needs more tiles and board removing to get back to something solid then do it.
poly filla would be a mistake.

and be sure to resolve why it is damaged in the first place.

 

[Raff]

Hi, yes I think its foil backed since its almost shiny tape on the back. Once the plaster/cement pink stuff fell off I took all the wet and soft bits off till it reached a more solid touch.

The plasterboard is against the kitchen sink it has been screwed in to the timber frame on the back which is still solid, just removed the old screws.

Is pollyfilla no good ? was considering B&Qs plaster repair bucket.

It got wet due to old kitchen work top chipboard getting water ingress at the back (sealant had work out), won't make same mistake again !

 

[Radioman]

I would cut back to solid and clean off any board adhesive to get to brick or block, apply 2 coats neat PVA and allow to dry. I would then apply 2 coats of Gypsum Hardwall and tile over.

 

[Raff]

Thanks, going to do similar get rid of the damaged bits and bobs, clean it off and then put a piece of wood screwed in for support with PVA on it and just plaster on top.

Think I will use pollyfilla plaster repair kit since many reviewers suggested the same when they pulled there work tops off and took half the tiles and wall along with it.

Found a good video here:

https://www.youtube.com/watch?v=H9ezRSoZ8GE

Thanks for the advice

 

[Radioman]

Is this a stud wall you are repairing or is it dot and dab onto brick or block? If it's a stud wall that will work without any filler, just tile over. If it is a brick or block wall that won't work.

 

[Two-Pipes]

I would cut back to solid and clean off any board adhesive to get to brick or block, apply 2 coats neat PVA and allow to dry. I would then apply 2 coats of Gypsum Hardwall and tile over.

It's a stud wall by the sound of things. British Gypsum say not to use bonding agents with Hardwall and PVA should rarely be used neat as it will just skin on the surface rather than soak in and create a bond with the substrate - a second diluted coat should then be applied and the plaster put on when this is still tacky.

Just saying like :25:

 

[Radioman]

It's a stud wall by the sound of things. British Gypsum say not to use bonding agents with Hardwall and PVA should rarely be used neat as it will just skin on the surface rather than soak in and create a bond with the substrate - a second diluted coat should then be applied and the plaster put on when this is still tacky.

Just saying like :25:

Don't care what they say we've done it that way for 20 years never had a problem, never had any shrinkage, never had any bonding issues and my plasterer was trained by BG.