Is it possible to have a rough wetdash ('harling' up here) finish on EWI? I prefer the traditional textured look to the crisp smooth finish that usually comes with EWI.

Looking to use cork boards. Not DIY!

Thanks.

With EWI, usually the mesh and base coat(s), which look like a grey cement, are done in readiness for the top coloured acrylic or silicone render. That top coat is just a couple of mm. I've never put harling onto that, though theoretically, it is just a hard, flat surface.

I think the question would need to be put to the installers, as the loading of the harling would be many times more than the thin polymer render. That translates into the extra load on the EWI fixings.

The answer is that if you have enough fixings it will be fine. The question is how do you know how many fixings is "enough".

I suspect a cementitious harling also won't be as effective at preventing moisture ingress, so that "could" also be an issue.

That was probably no help whatsoever!!

Posted By: Peter_in_HungaryAny advantage to cork boards rather than the standard EPS

It's naturally fire resistant, a renewable resource, easily recycled, supports employment in growing, harvesting and processing, thermal conductivity not too far below EPS...

For harling you could use lightweight “aggregate” eps, micafill, etc

10mm canterbury spare finish on a lot of council house EWI projects round my way

djh
yes, just pointing it out to show a heavier finish is used on EWI