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NHBC Guidance looks for minimum 15mm drained cavity in case render fails and water starts to rot timber

Morley, the problem is that the OSB of the SIPS panel will have a moisture content in the region of 22% - even when delivered from the factory. Once rendered this will dry out - shrink & crack. You would need to fit timber battens to the SIPS panel - fit an inert carrier board - E board or...

www.wemico.com think they@re in your kneck of the woods

Best to use powder coated stainless steel beads with plastic nosings. Depending on the colour of the render - these can also be colour matched. The powedr coating means you don't see any bare metal that would look cheap. The bead provides a sharp edge to work to. You hardly see the nosing once...

Dasbo, I have a bit of knowledge on this subject - if the render as you suggest is sound - I would recommend a Polmer modified Render Basecoat is applied in one coat - 10 -12mm thick over the existing dry dash. Then either an Acrylic or Silicate Render Topcoat is applied. Best Company to use...