The foundation is the part of your shed project most homeowners think about last — and the part that does the most to determine how long the shed actually lasts. Maryland adds specific complications that generic guides miss: heavy clay soil that holds moisture, a 30-inch frost line, high summer humidity, and active subterranean termite populations. Get the foundation wrong and you’ll have sticking doors by year two and rot by year five. Get it right and your shed will still be level and dry in decade three. Here’s how every major foundation option performs against Maryland’s specific conditions.