Corrugated Aluminum Window Well
Corrugated aluminum keeps the dirt out while letting the sun shine into the basement's window. The metal may even help brighten the space by bouncing light into the interior. Building codes in most, if not all, municipalities require egress windows in basements. Egress windows allow people to escape in a hurry in case of a fire. The ripples offer an advantage that other materials may not; a toe hold to facilitate an escape.