I just had a new roof installed with Cambridge Dual Grey asphalt shingles. The installer left me a substantial pile of spares: five packages of 41"x14"x2.5". I get the logic of keeping these around for repairs, but the storage recommendations I’ve found online totally defeat me: Not too warm, not too cool, not too moist, not on the floor and no stacking. That implies an indoor area of at least 20 square feet that I can’t use for anything else.
Can you help me with some practical advice?