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<blockquote data-quote="JMichael" data-source="post: 305936" data-attributes="member: 7544"><p>Have you even taken a sheet of ply and laid it on the ground, then come back a few hours later or next day and see the wood curling up on the edges (cupping)? The reason it does this is because the side next to the ground is absorbing moisture from the ground. The same thing will happen if you seal one side and leave one side raw. You may have it fastened down so the cupping doesn't show visually, but the wood will be constantly pulling against the fasteners. Once the wood is cured (kiln dried etc) you normally don't want it to absorb any moisture since moisture is the cause of most wood rot.</p></blockquote><p></p>
[QUOTE="JMichael, post: 305936, member: 7544"] Have you even taken a sheet of ply and laid it on the ground, then come back a few hours later or next day and see the wood curling up on the edges (cupping)? The reason it does this is because the side next to the ground is absorbing moisture from the ground. The same thing will happen if you seal one side and leave one side raw. You may have it fastened down so the cupping doesn't show visually, but the wood will be constantly pulling against the fasteners. Once the wood is cured (kiln dried etc) you normally don't want it to absorb any moisture since moisture is the cause of most wood rot. [/QUOTE]
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