Jub and Sto do a nano silicone.
But self cleaning? It works when water (rain) runs down collecting the dirt but what about under eaves, soffit boards, sills and the East side what keeps dry? It will probably physically clean easier with soapy water and brush.
I find a lot of the lads with spray guns are small outfits that cannot cope with big areas finished by hand. Dave who Mr White quoted has it bang on but he has invested a lot in equipment and uses a quality silicone.
I do wonder though with the render needing to be absolutely flat and perfect...
I did 20mm once and that was hard enough. I used a 6:1:1 mix and the sand was 4 parts sharp 2 parts soft as it needed to be fatty. Used Febmix too.
It sounds bizarre but as said above you might need to hand apply each stone.
i have seen cottages in Norfolk with what looks like 60mm pebbles...
As John J said above take a note of where the sun is at a particular time. Not always possible on a cloudy day but I always established what was west as thats the wettest side so that usually got done first.
If the phone rings you can calculate what time of day not to go back.
It will probably fail as there is no dpc, no dpm or adequate copings.
The latest fashion of flat tops with no copings is a complete waste of time.
At least fit adequate copings with a built in drip and the coping stuck down with sbr slurry, a tanking of some sort or dpm and stop short at least...
You will need at least 40mm insulation to be of any benefit and as to window sills and eaves etc there are retrofit trims available to accommodate. An ewi installer will have examples of work or photos he can show you. There are some youtube vids if you search, Sto do a few.
As to going over...
Are you getting a manufacturers warranty? Ring them and get the technical rep out. Dave France up here in North of England.
They will condemn that work.
These often fail and it is not down to the renderer. Everything about these walls are wrong in the way they are built.
Usually no tanking from behind, inadequate coping stones including a lack off a dpm under them and built in drips , no dpc and nearly always never a minimum of 150mm above...
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