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The TuffBlock Instant Foundation System is a lightweight deck foundation alternative to concrete. It consists of multiple floating deck blocks that sit on top of the ground and accept pieces of wood to construct decks garden sheds landings pathways raised walkways cubby houses dog shelters and more.Each TuffBlock can support up to 1700 pounds and weighs only 1.5 pounds. They are designed to accept 2×4 2×6 2×8 Joists and 4×4 Posts. The TuffBlock system is unique because it allows you to build a deck that is as low as 6.5 inches off the ground with no digging.The TuffBlocks are made from recycled polyolefin material with an ultra-high UV rating. They are designed with a ventilated underside to prevent moisture buildup and termites. The TuffBlock system is the only block product that can be secured to the post or bearer to provide extra stability.