A vehicular body structure includes a polymeric deck panel. The deck panel includes an adjacent ridge and valley with a leg shared therebetween, a crossbeam footprint crosswise to the adjacent ridge and valley, and a rib extending along the adjacent ridge and valley. Outside the crossbeam footprint, the rib extends along the ridge, approaching the crossbeam footprint, the rib extends along the leg into the valley, and across the crossbeam footprint, the rib extends along the valley.