Siding or roofing panel system

A panel configured for attachment to a mounting surface, comprising:

• a plurality of raised faces formed between a lock edge and a butt edge of the panel;
• a plurality of recessed keyways defined between each of the raised faces, wherein the raised faces and the keyways define a plurality of elements spaced at an average element distance;
• a lock flange formed at the lock edge and defining a lock slot between layers of the panel, wherein the lock flange closes the lock slot to substantially zero depth at a first touch point and a second touch point;
• a recessed base formed at the keyways adjacent the butt edge, wherein the recessed base defines a fold lip adjacent the mounting surface;
• a full base formed at the raised faces adjacent the butt edge, wherein the full base extends further than the recessed base, and the fold lip joins the recessed base to the full base to define a continuous fold line;
• and
• an under lap extending from the full base toward the lock edge, wherein the fold lip is configured to provide a reaction point for the under lap, and the reaction point is offset from the continuous fold line such that the under lap is overlapping the fold lip.