EWI on to SIPS

[James-the-doubter]

Hi all,

Looking for some assistance on wall build up for a SIPS systrem (I am using the Kingspan TEK system if that helps). The outside of the SIPS panel have been wrapped with a breather membrance and are then to be clad with 50mm rockwool, which will then be rendered using something like EWI silicone render.

The EWI instructions for a rockwool build-up involve using their basecoat adhesives to stick the rockwool to the substrate, which in this case would be OSB coevred with breather membrane. My question is whether there is any point in using the adhesive on the breather membrane, and whether i could just omit the adhesive and just use mechanical fixings/washers?

My concerns are 1.) that the adhesive may stick to the breather membrane, but this serves no prupose as the breather membrane is just stapled to the OSB; and 2; the breather membrane is a technical material and the use of the adhesive will 'clog' the membrane and prevent moisture escaping (even though the adhesive is advertsied as breathable).

Any thoughts or methods that have worked well in the past would be much appreciated.

Thanks.