Hi folks.
I need to fix new tiles in my bathroom, but they exceeded the weight limit of bonding/skim, so I have stripped back the plaster to expose the blockwork and will need to render it instead. I've done some DIY plastering, but have no knowledge of rendering, so would anyone be able to help me out with some info, please?
The bathroom walls were originally rendered half-way up, and its so hard to remove that I would like to leave the existing rendering in place and just add new render the remaining top half. Here's a pic:
http://j.imagehost.org/0961/P1010671.jpg
1) I've sanded off all the original Bonding Coat as best as poss. Should I give the blockwork a good coat of PVA (or something else) before rendering ... or do I just wet the walls down alittle to stop suction ?
2) I need to make up approx 18mm depth to match the original render depth on the bottom half of the wall, but considerably more in parts where the blockwork have suffered damage from removing the plaster. Should I do the render in two coats? How long do I wait between coats?
3) What mix for each coat and do I add plastersiser? I see so many conflicting ratio's on the web....some add lime, some add waterproofer etc etc...???
4) When I tile over the whole area, will there be any chance of movement where the new rendering meets the old? Is it likely to cause problems/cracking along the grout lines in my tiling?
Many thanks in advance, guys.
I need to fix new tiles in my bathroom, but they exceeded the weight limit of bonding/skim, so I have stripped back the plaster to expose the blockwork and will need to render it instead. I've done some DIY plastering, but have no knowledge of rendering, so would anyone be able to help me out with some info, please?
The bathroom walls were originally rendered half-way up, and its so hard to remove that I would like to leave the existing rendering in place and just add new render the remaining top half. Here's a pic:
http://j.imagehost.org/0961/P1010671.jpg
1) I've sanded off all the original Bonding Coat as best as poss. Should I give the blockwork a good coat of PVA (or something else) before rendering ... or do I just wet the walls down alittle to stop suction ?
2) I need to make up approx 18mm depth to match the original render depth on the bottom half of the wall, but considerably more in parts where the blockwork have suffered damage from removing the plaster. Should I do the render in two coats? How long do I wait between coats?
3) What mix for each coat and do I add plastersiser? I see so many conflicting ratio's on the web....some add lime, some add waterproofer etc etc...???
4) When I tile over the whole area, will there be any chance of movement where the new rendering meets the old? Is it likely to cause problems/cracking along the grout lines in my tiling?
Many thanks in advance, guys.
or he could dib and dob it!
