Which RockWool EWI Can I Use Cos Everywhere Out Of Stock?

4 May 2016
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United Kingdom
I need 50mm rockwool external insulation and was originally gonna get this one:

Duel Density

but I rang rockwool and they told me I need Rainscreen Duo slabs which are out of stock pretty much everywhere (or minimum order 12 packs).

All I'm doing is screwing it onto a wooden outbuilding over Tyvek, then vertical battens and composite cladding.

Everyone I ring keeps saying the Dual Density is "untested" for this and is made for direct applied renders only.

I don't see what's the difference between them and why they can't be used interchangeably.

Anyone know about this?

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