[user1007]

What sort of OSB was used with the suggestion you did not have to cover it with some sort of membrane---especially if outside. I do not mind the stuff as much as some but if any water or serious moisture gets to it, it will swell and crumble? Usually builders wrap the stuff fairly quickly in tyvek or something.

I guess you could use some sort of sealing resin product and I have seen artsy OSB walls in interiors done this way. Look awful to me. But you do plan to prime and paint.

You cannot just float 1cm stucco (plaster is really used only for interior surfaces these days) without it being attached to something.

You could try thin metal plating, or argh ick, vinyl. I guess if going for a smooth look, for whatever reason. You do realize any attempt at a perfectly smooth exterior surface is going to dent and ding quickly right?

 

[user1007]

Hi,
I was suggested to attach a metallic net to the OSB plates using nails and then plaster it

Sorry, your post suggested you planned to plaster, not stucco, over OSB for an exterior application.

You still need a waterproof membrane like house wrap or something over the OSB before anything else. Then you can prep with mesh or whatever the contractor you pick suggests for a nice stucco job as smooth as the artisans can deliver given the properties of the stuff.

You can even lime finish it for a Eureopean look like in the video if that is what you are seeking. You cannot if you prime and paint with other materials first though.

I thought you were asking us for some sort of siding material recommendations over exposed OSB.