SmartFloor is engineered for strength, with no natural splits along the grain. A single layer of SmartFloor in a 10'x20' shed has a huge 40,000-pound live load rating, about five times what most housing codes require. For parking a vehicle, we recommend doubling a SmartFloor.
Engineered wood stays stronger longer, resistant to moisture, termites and fungus. Weight is not the best guide to floor strength. Consider – to a termite, a heavy plank floor is just a bigger meal. The validated strength data of engineered wood is far more reliable.