ᐅ KfW 55, Ytong 36.5 poorly bonded, too many gaps?

Hello,

we are currently at the shell construction stage of our KFW 55 bungalow.

Since the sun was shining at a favorable angle today, we noticed several gaps in the masonry. In some areas, the sunlight shines completely through.

We then inspected the joints more closely. Hardly any joint is properly sealed. We can almost everywhere insert the blade of a pocket knife 2-4 cm (1-1.5 inches) deep.

The site manager’s comment was, "the plaster will take care of sealing that"—2 cm (0.8 inches) on the outside and 1 cm (0.4 inches) on the inside.

We deliberately chose a 36.5 cm (14.4 inches) thick block with a lambda value of 0.09. Am I correct in understanding that if the blocks are not fully bonded, the insulation value will significantly decrease? The blocks are not properly connected... neither horizontally nor vertically.

Best regards
Olaf Mayer

No problem!

Masons work roughly, not with fine precision; with hollow bricks, the gaps would be even larger because they shrink differently during the firing process.

Regards, Bauexperte

And what about the insulation values / thermal insulation?

Olaf Mayer schrieb:

And the insulation values / thermal insulation?

What exactly do you mean by that?

Olaf Mayer schrieb:

Could you please disable that?

Best regards, Bauexperte

Olaf Mayer schrieb:

Well, then cold air can easily pass through... 36.5cm (14 inches) of brick for nothing....

Only if it has neither exterior nor interior plaster.

Regards, Bauexperte

Yes, but then I would only have 2cm (1 inch) of insulation (plaster), and the 36.5 cm (14.4 inches) stone wall would be irrelevant... Am I completely mistaken in thinking this?