ᐅ Wall thickness

Hello everyone!

We have chosen a Flair 124 ZD from Town & Country. The plan was a 24 cm (9.5 inches) wall made of aerated concrete plan blocks with plaster applied directly onto the blocks. The builder recommends using a 30 cm (12 inches) wall made of the same material instead. Does that make sense, or is it just a way to charge more?

Hello,

just to clarify: We are talking about the exterior wall here, right?

Personally, I find a thickness of 24 cm (9.5 inches) a bit thin if no additional insulation is applied.

Is there any energy standard specified for the house?

The concrete builders generally proposed an exterior wall made of aerated concrete with a thickness of 36.5 cm (14 inches).

Best regards,

Dirk

A 24 cm (9.5 inches) exterior wall is probably standard. A 30 cm (12 inches) wall is supposed to improve sound insulation. Nothing is planned regarding the exterior wall for KfW. I am completely overwhelmed.

Hello,

Soundproofing is one thing...

In your place, I would also consider thermal insulation.

Is your plot located in a way that soundproofing plays an important role?

Regards,

Dirk

There might be a bypass built in the future. It would then be located about 500 m (550 yards) away.

Although I usually don’t rely on them much, if I were you, I would use an online U-value calculator to work out the U-value for your wall.

This will give you an initial reference point. The required U-value for a vertical external wall is currently around 0.24 W/m²·K. However, the energy saving regulations are a mixed calculation, so the U-value of the external wall is only one factor.

Regards