Abstract: The invention is a flat-faced, or planar-clad, corrugated panel with an interface at opposing side-edges. The interface has an extended-crescent and a planar-member extension making an interface such that a plurality of panels are joined and taken apart from below generally without the use of tools. The aesthetically a uniform and finished appearance of the panels is affected. The upper-surface, having corrugations, sheds water, generally without leaking. A plurality of joined panels can be supported by a grid below.

Abstract: This invention allows a grid structure with simple interfaces, where grid members generally can be installed and uninstalled by hand from below. Using under decks, with the addition of panels and panel holding means, and the further addition of a gutter and downspout provides an effective under-deck water shedding system.