plaster old wall, gyprock on top ?

[michael_jenny]

Hi to all on this forum..I am new here....told this was a good place to find all the right info.......

can I glue gyprock straight onto an old rendered wall. I have a 1900 brick victorian house.

there are so many holes on the wall i thought it would be easier and cheaper to do this than render so many huge holes. metres of them.

the room is 4 x 4 and 3.3 metres high.

i was going to remove the old plaster and wash the bricks so that the glue grabbed better but was told over the phone by a tradesman this is too messy so just glue on top.

does anyone know how many millimetres the glue will add to the 10mm plasterboard ?? is this whats normally done or do people remove the old rendered plaster ....(sandy dirt really) and glue to the wall. ??

i am worried the fix of the plasterboard wont be as great..

i am removing the door jam as well so need to get the thickness of the new jam right. ie 12 or 15 mm thicker etc....

I have already removed the ceiling totally to add rails and plasterboard.

thanks all

michael

[BrisBen]

hey there

try these sites first and see if they have some general hints.

http://www.gyprock.com.au/

http://www.boral.com.au

http://www.lafargeplasterboard.com.au/plastamasta_general

As far as re-lining the walls with 10mm board and masonary adhesive, it can be a bit tricky but the manufacturers sites can give you the necessary application ideas.

If you think the "stick on" method is a bit tricky, look into using a batten fixed to the wall with the plasterboard fixed to that (at least that way you can pack out the battens to level out the wall.


just a start

[johnc]

If the render is fairly old it will be a lime sand mix and will come away easily but leave a lot of dust. Because packing out with battens or even just sticking on the plaster causes problems with doors and windows needing architrave etc packed out I'd go to the trouble of removing the lot. Not sure just how much the glue leaves as a gap, possibly depends a bit on how thickly you dab it on, but not much as it shrinks back a bit as it dries.

John

[michael_jenny]

thanks for the quick reply.

I am rebuilding the room, and yes its the lime plaster etc and easily removed. But it is very thick, ie 70mm in some areas so saves packing out plasterboard etc as its very straight .

I am replacing the only window in the room, and the door jam so the difference in depth can be allowed for when ordering new window etc..

thanks for the links too.

links satthe depth of glue is 10mm it says. plus 10mm plasterboard, say to allow 20mm depth...

looks like it stays on.

just wondered if anyone on this forum had done it.

cheers

michael

[Jacksin]

Any adhesive is only as good as the surface it is applied to and, as you have described the rendered plaster as 'sandy dirt' I would be concerned it might let go in time.

I guess then its your choice in the end, but its the type of job you only want do once.
Good luck