Eml on cement board

[burty]

Hi all, could do with a bit of advice, ive got a dormer to render which has been covered with a smooth faced cement board then rib lath. what process would you advise? Not sure if anything is needed to control the suction of the cement board?? 3:1 then 4:1?? Apologies for all the questions, I don't do much rendering, normally kept on the insides!
Thanks

 

[malc]

i would scrim and thincoat on cement board. not sand and cement on rib lath.

 

[MikeAtthis]

take the lath of get some weber lac and mesh then a thin coat finish 6mm all in

 

[burty]

Thanks guys, trouble is the boss has already done it ready and they want sand and cement to match the house ! Last time I went over cement board I was told to mesh, SBR slurry then two coat s&c as the mesh is already any way around it?

 

[MikeAtthis]

i guess your going 3 coats lol

 

[User___removed]

Just just sand & cement then if it's meshed
Keep the mixes week
6/1/1 scratch
7/1/1 float coat
Put fibres in the scratch coat

 

[Gibbo]

5 1 1 pricking up coat needed aswell