When a material accepts quantities of gases or liquid, such as moisture. Roof discoloration that can be caused by algae. Commonly described incorrectly as fungus growth. Roofing nails and staples driven into decks at angles not parallel to the deck to fit into tons of tight spaces without running the nailer’s handle into a wall A laminated style of shingle with a architectural design A temporary water washable line made on the roof by snapping a taut string or cord dusted with chalk. Used for alignment and level purposes.