Hello everyone,
I know this question can’t really be answered generally, since we want to achieve KfW55 standard with our extension. However, to be able to discuss with our energy consultant and suggest alternatives, I wanted to ask how the concrete slab (approximately 4x4m or 13x13 ft) for an extension affects the height. The concrete slab is intended to serve later as a terrace for the apartment above.
I assume (the structural engineer will have to confirm) that the concrete slab will be about 18-20cm (7-8 inches) thick. How would the layers above that look? Bitumen membrane, insulation plus a second bitumen membrane, gravel or pedestals (around 2cm (1 inch)), terrace tiles (4-5cm or 1.5-2 inches)? In other words, the height is mainly influenced by the insulation. Overall, I shouldn’t expect less than 35-40cm (14-16 inches) in total.
Are there any alternatives to a concrete slab that would allow for less buildup height while still meeting KfW55 requirements ideally?
Best regards
I know this question can’t really be answered generally, since we want to achieve KfW55 standard with our extension. However, to be able to discuss with our energy consultant and suggest alternatives, I wanted to ask how the concrete slab (approximately 4x4m or 13x13 ft) for an extension affects the height. The concrete slab is intended to serve later as a terrace for the apartment above.
I assume (the structural engineer will have to confirm) that the concrete slab will be about 18-20cm (7-8 inches) thick. How would the layers above that look? Bitumen membrane, insulation plus a second bitumen membrane, gravel or pedestals (around 2cm (1 inch)), terrace tiles (4-5cm or 1.5-2 inches)? In other words, the height is mainly influenced by the insulation. Overall, I shouldn’t expect less than 35-40cm (14-16 inches) in total.
Are there any alternatives to a concrete slab that would allow for less buildup height while still meeting KfW55 requirements ideally?
Best regards
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