ᐅ 30 cm Thick Exterior Wall – Compliant with the 2014 Energy Saving Regulation?

Hello everyone,

Is it still possible nowadays to build an exterior wall with "only" 30cm (12 inches) thickness based on the mandatory energy-saving regulations?

Best regards.

Sure. Plaster carrier boards, stud framework with insulation wool, vapor barrier, installation layer, drywall.

Thank you for the response.

Sorry, I forgot to mention that the question relates to solid construction (for example, pumice stone, Poroton, limestone, aerated concrete...).

Difficult... possibly reinforced concrete with external thermal insulation composite system (ETICS).

Poroton T8 is available from Wienerberger in a thickness of 30 cm (12 inches). This achieves a U-value of 0.26, just below the requirement of 0.28. Whether there are any structural issues – no idea.

By installing passive house windows and 30 cm (12 inches) of roof insulation, it might be possible to use a slightly less efficient block.

However, this is not advisable. Why not at least use 36.5 cm (14 inches) or 42.5 cm (17 inches) for monolithic masonry?

With plaster, it's more than 30 cm (12 inches)...
But Grym is right, why the requirement?