The 20mm gap is to avoid deflection onto the wall. This is filled with resilient materials such as expanded foam alternative mortar that has a lower compressive strength than the AAC blocks itself. It's highly recommended to fill this gap to avoid noise flanking transmission. The face of the wall can be sealed with a joint sealer if foam is used.
The 20mm gap is to avoid deflection onto the wall. This is filled with resilient materials such as expanded foam alternative mortar that has a lower compressive strength than the AAC blocks itself. It's highly recommended to fill this gap to avoid noise flanking transmission. The face of the wall can be sealed with a joint sealer if foam is used.
Thanks for making this video
Useful video, thank you. Is the 20mm gap at the top filled with cement mortar?
That 20 mm gap will
Remain open or what?