The cure for cracks? Homeowners should add moisture to the air during dry periods. It's their choice-live with the cracks and wait until spring, or else add humidity by opening the dishwasher after a rinse cycle, switching off the bathroom fan or hanging laundry to dry in the basement near the furnace. Better yet, install a humidifier in the furnace, or an exterior air vent for the furnace burner.If cracks are a concern, wpc decking board moves less and shows fewer gaps.
"Cupping and crowning" are common complaints that develop with high humidity. Both problems occur across the width of the wpc decking board.Cupping is when the edges of a board are high and its center is lower. It can occur after water spills onto the wpc decking board and is absorbed by the wood, but high humidity is more often the cause. If the wood expands significantly, compression set can result as the wpc decking board are crushed together, deforming the boards at the edges.