Share 'Brep Intersection Problem (offset the intersection curves)'

Hi there. I have a Brep (created mannually) that i Wish to intersect with a series of planes (zx). The idea is to get  a series of parallel ribs in order to give our structural engineers the profiles information for a steel structure behind the panels. So far the intersection works fine, but As soon as i try to offset the curves (to create the ribs surface) the direction of the offset changes (r…