is there an alternative to eml for rendering with sand and cement over an old stone wall to prevent cracking as it will be going on quite thick in places,thanks
Similar mate....but......as you fix it your overlap is more solid, as the ribs overlap one another = less chance of cracking.Rib lathe is similar to eml is it not ??
I would use fibre mesh in the scratch coatI know what it is that's y I said it's similar. So they ain't a great deal of difference to eml
You will find rib lath has more strength and key than eml. Eml is a render carrier.
But as suggested above. Treat your existing surface first with a bonding agent like an sbr slurry or Rendagrip. Build out your hollows and let cure. Use mesh fibres in your mix. Them fix your wire mesh.
Personally, after going to the trouble of building out the stone as described above, I would use a modern polyester rendering mesh 8-10 mm mesh. Maybe 6mm fibreglass strands as well for good measure.
Parex TV 10 mesh is ideal for sand and cement. The usual 4mm mesh is too small for sand and cement.
Once you have got that far just render as normal.
one more thing,when using the polyester render mesh how do you fix it,do you paint a slurry of unibond over it to hold down or just render straight over,thanks
Thought the ribs go against the wallSimilar mate....but......as you fix it your overlap is more solid, as the ribs overlap one another = less chance of cracking.
If the wall is really, really uneven, ....scratch it first, then lath, then scratch out to the ribs, then float out to a finish......several days between coats is best.
Otherwise use render mesh.
I've always done it rib out, used the ribs to get a nice even scratch coat.....dunno if its right.......Thought the ribs go against the wall
I've always done it rib out, used the ribs to get a nice even scratch coat.....dunno if its right.......
You way is the wrong way dan
Yeh or do it in two passes so on a 10mm base 5mm bed in then top another 5mmhow deep into the render does the mesh go,i laid on the render and then trowelled the mesh in,when i scratched the render it was exposing surface of the mesh is that ok or should i have put another tight coat over the top to give it a bit more depth and then scratched,thanks