broken plasterboard

[mart]

As part of my kitchen wall I've got plasterboards attached to the breezeblock by 'dabs', which means theres a gap between the plasterboard and the breezeblock.
I've accidentally broken off a section of the plaster board about a foot long and three inches wide. Can i plaster over it, oe squirt foam into it or will the whole of the plasterboard have to be replaced?
Any help would be gratefully recieved

 

[DAZB]

You could just patch a piece back in using a 'dab' of Drywall Adhesive and then skim it over with Finish plaster.

 

[mart]

would expansion foam do the trick or is it hard to produce a smooth finish over it, ive got to put tiles over it when done.

 

[breezer]

i have used expanding foam, you can cut it with a knife or saw when completely dry, but dont touch it while wet

 

[DAZB]

Using foam will do the job fine. If you cut it flush when it is cured the tile adhesive will bond to it no problem.