Wood Deck Boards Cupping
The problem of deck boards cupping is common but it should not be happening.
Wood deck boards cupping. A board that is correctly installed right side up or bark side down will form a crown and allow water to run off the edges. In the case of cupping the moisture content is different on the top surface compared to the bottom surface. The board will shrink and warp in the opposite direction of the rings in the wood. The main reason proponents like this method is ironically to reduce cupping.
This article explains the causes of wood board cupping and gives advice concluding that unless a board is already badly cupped or has a bad side when construction of outdoor decks and wood stairs you should place. From what you are describing there could be a few different reasons why your deck is acting the way it is and the most likely cause is the way the boards are nailed down. This has to do with the board s reaction to moisture and the heat of the sun. This article series explains the causes of cupping in wood boards wood board right side up advice for steps decks ramps.
Bark side up or down on exterior wood decks stairs. But when it rains and the board warps water collects in the concave shape and pools there. The result is either a cupping of the wood or a crowning depending on which way you face the board. Deck cupping as in the picture from another deck company below is when the topside of the deck board curls or arches.