Rendering external blockwork

[Jim54]

Hi,
I need to render some external block work, I plan to use sharp sand, cement and water in a 4,1,1 mix. I was planning on wetting the wall first and applying the mix in a 10mm layer and then scraping lines in it. I was going to then wait a week, and apply a finishing coat, and then sponge it smooth before waiting another week to paint it.

What I'm don't really understand is the type of bead I should use for the horizontal and the verticals and how I should attach them? I presume I use nails for the bottom beads, but do I fix the vertical ones with nails, or use the first cement coat to fix it?

Any tips or suggestions would be really appreciated,

 

[foxhole]

Bell bead for horizontals and stop bead for verticals, I fixed with stainless steel screws straight into thermalite blocks. [will also require water proofer].

 

[Jim54]

Hi,
These are the blocks I'm using https://www.mkmbs.co.uk/prodb003268-440mm-x-215mm-x-100mm-solid-lightweight-block-7n/
I wasn't sure about waterproofer, thought I had to water the wall so that it could suck the render to it, could you explain?

Does the general procedure I outlined sound about right?
Thanks

 

[pilsbury]

I think waterproofer goes in the scratch coat only. Wetting the wall first sounds right to stop all the moisture getting sucked out of your muck.