Last year we installed a Newton system in the cellar and used a cement based render over the waterproof membrane covering the walls.
We followed the instructions on the Newton site using six parts clean sharp sand/one part lime/one part cement. A two-coat application was applied leaving plenty of time for drying. This was then skimmed with a 3-5mm finishing coat, and painted.
I recently noticed a large crack down one end of the room where the finishing plaster has literally come off the wall. I started to peel this off hoping I would get to a stage where the edges were all bonded to the render but I now have a large area of bare render(~600mm by 300mm) and some of the edges are still loose, moving when I put pressure on them. I'm worried that if I keep pulling more off I'll end up stripping the whole wall.
I didn't do the rendering/plastering (I'm not a plasterer) but was thinking that I could try to use something to re-bond the loose edges, add a couple of coats of PVA and then skim the area with finishing plaster. Any help on what to do here would be really appreciated.
Thanks in advance,
Nick
We followed the instructions on the Newton site using six parts clean sharp sand/one part lime/one part cement. A two-coat application was applied leaving plenty of time for drying. This was then skimmed with a 3-5mm finishing coat, and painted.
I recently noticed a large crack down one end of the room where the finishing plaster has literally come off the wall. I started to peel this off hoping I would get to a stage where the edges were all bonded to the render but I now have a large area of bare render(~600mm by 300mm) and some of the edges are still loose, moving when I put pressure on them. I'm worried that if I keep pulling more off I'll end up stripping the whole wall.
I didn't do the rendering/plastering (I'm not a plasterer) but was thinking that I could try to use something to re-bond the loose edges, add a couple of coats of PVA and then skim the area with finishing plaster. Any help on what to do here would be really appreciated.
Thanks in advance,
Nick