Hi everyone, Bit of an odd posting. I'm working on a personal building project. The ground floor needs a sloping concrete floor to be flattened. I would just like to know if the OSB lattice will be strong enough. The sloping concrete floor to insulate & flatten out using wood. This is how the sub floor will be made: Stand an OSB board (18mm) on its edge (A), flick a builders chalk line to get the straight line, cut, and fix. Repeat all the way. Here's detail of how each will be braced, fixed, filled - spaced at 40 or 50cm: To reduce cold bridging on the OSB, I'll cut small curves into the base: This idea is based on OSB I-beams. The only differences are: 1 = I beam's have a laminate strip top and bottom. However, these aren't needed, as the OSB is sitting on a concrete floor. 2 = My idea will use 18mm OSB thickness, compared to normal 9.5mm thickness in Ibeams. Will the OSB lattice sitting on a concrete floor be strong enough?