I drew the beams and on top of it I drew a plane surface using the select boundary. Then I set the reinforcement etc. But it doesn't show a field to set the slab thickness. Did I add the monolithic slab in a non-proper way? Project file: Concrete 1.rf6 (7.4 MB) [conc slab error] [conc slab …

[image] BigBoss: But it doesn't show a field to set the slab thickness. You can set the slab thickness here: [grafik] [grafik] Have a nice weekend, Frank