Ubakus roof example extract - What is an Under Deck Plate?

[Space Race]

In the case of the attached Ubakus example what material would be used for the 35mm unterdeckplatte?

[Nickfromwales]

Google translate may help lol

 

https://www.naturanum.de/steico-universal-unterdeck-und-wandbauplatte?srsltid=AfmBOoql92NadyXa-HswXA3NyrDmhuB_LFO4Xh6xxaI7B5sBIZmiSGaX

[Space Race]

Right, So it's basically just a sheathing layer albeit insulated. Had not realised this was needed, The thicker wood fibre insulation I'd looked at did both duties. Thanks