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Can Sunflowood’s Planks be made into a watertight surface?

No, Sunflowood is made with weep holes every 9" on the tongue. These weep holes allow water to drain off of the deck. Correct installation of the product with hand pressure gives you a gap of up to 1/4" between planks. This gap allows the product to expand and contract with temperature changes. If this gap is made watertight by a caulk product, the product will not have the ability to expand and contract in the gap.

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