Abstract: An attic deck system for an attic having a plurality of spaced-apart attic joists. The system includes a plurality of deck panels each having a first edge portion defining a first series of alternating projections and recesses, and a second edge portion defining a second series of alternating projections and recesses. The first series of alternating projections and recesses being complementary to the second series of alternating projections and recesses such that the first edge portion of one of the panels interlocks with the second edge portion of another one of the panels. Each of the panels defines a width extending between an outermost periphery of the first edge portion and an outermost periphery of the second edge portion. The width is approximately equal to a distance measured between the outer edges of adjacent attic joists, such that the first and second edge portions of one of the panels are positionable on the respective adjacent attic joists.