I would like to know if the 2 insulation layers may have a structural function and be sufficient to support the tiles, or if battens and counter battens are needed anyway?

IKO enertherm PIR used in a pitched roof application can only be installed in-between the rafters and underneath the rafters. IKO enertherm PIR is not to be used as a structural material and therefore should not be installed on top of the rafters under counter battens.

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