On the definition of their correct roughness
Interior side of element walls
![Implementation of roughness according to [1]](https://www.bft-international.com/imgs/1/2/6/7/7/7/9/6_5_Krell_Abb_540_175-aa44f399d3a90eab.jpeg)
An element wall should give a monolithic impression when in use. There is to be a firm bond between the shells and the filling concrete. The bond achieved has an influence mainly on:
the load-bearing action, that is, the force transmissible in the joint (DIN EN 1992-1-1 very smooth to interlocked);
the composite action in terms of soundproofing (is a thick wall vibrating, or are three slabs vibrating);
the composite action in terms of tightness in water-impermeable structures.
For the structural approach, DIN EN 1992-1-1 specifies four options ranging from very smooth, smooth, rough to very...
