The best deck drainage system is one that is installed above the joists. Watch this video to see what happens to the wood with an under-the-joist deck drainage system.Ĭhoose an Over-the-Joist Deck Drainage System Over time, this is the perfect formula for wood rot: moisture + heat – ventilation = destruction. Third, in the hot months of summer, the temperature further cooks this trapped, wet wood and accelerates the rotting.The only ventilation is through the quarter-inch or less space between the top deck boards. If a ceiling is beneath the deck, there’s no air coming in to dry the wood. Second, this type of system can trap in moisture.The water hits the pan and runs out, but not before drenching the joists. First, it allows the wood to get wet over and over as rain drips through the deck boards, over the joists and into the drainage system below.The Problem with a Below-the-Joist Deck Drainage SystemĪ below-the-joist deck drainage system causes damage and wood rot in three ways: When the joists repeatedly get wet, they will eventually rot.Ĭhoosing the right deck drainage system will make a drastic difference in the life of your deck. An under-the-joist deck drainage system allows water to trickle through the slats in your decking, run over the joists and collect in the drainage system beneath.
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Should you install an over-the-joist or under-the-joist deck drainage system? An over-the-joist system is just that: the drainage system is placed over the joists so water never comes in contact with the joists and beams.
Next, you have an important choice to make. You’ve made the smart decision to install a drainage system under your new two-story deck, so you’ll have dry space beneath for entertaining, storage or relaxation.
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