ᐅ Price Difference Between Brick and Calcium Silicate Blocks with External Thermal Insulation Composite System (ETICS)

Hello everyone,

We have received a fixed-price offer for a new single-family house of about 135 sqm (1453 sq ft). We need to decide between 36.5 cm (14.4 inches) bricks with a thermal conductivity (Lambda) of 0.10 and calcium silicate bricks with external thermal insulation composite system (ETICS). The brick option costs over €8,000 more in total. The house is located in a quiet residential area. We are having a hard time deciding. How would you choose?

Use the materials the builder normally works with and has more experience with. Considering the price difference, there is a strong preference for sand-lime brick plus external thermal insulation composite system (ETICS).

Warning: The discussion tends to become very emotional due to strong biases.

Are both options equally energy efficient?

How thick does the wall have to be to create more living space?

tomtom79 schrieb:

How thick is the wall, does it create more living space?

Yes, they do. Both are 36.5 cm (14.4 inches) thick. Sand-lime brick 17.5 cm (6.9 inches) + 20 cm (7.9 inches) external thermal insulation composite system (ETICS) made of polystyrene.

Well, it is a clear defensive offer; the bricks offered have lower energy efficiency and are actually cheaper than the sand-lime brick option.