Before installing any materials under the deck for removing moisture, you should perform some prep work on the ground. Work the dirt under the deck to create a grade away from the home. A grade of at least six inches for every 10 feet works well. Do not leave a gap between the dirt and the home’s foundation where water could pool. Once you or a contractor regrades the dirt under the deck, you then can add materials over the top.

Cutting the boards directly is one of the fastest ways to remove deck boards with hidden fasteners. Mark two parallel lines that are one-third of the total measurement on both ends and cut out the centerpiece. Then, remove the end of the board that doesn’t have a fastener. Finally, pry open the fastened side and pull it up to pop out the screw or access the fastener. This also allows you to salvage portions of boards for other projects.

No, you don’t need a permit to repair and replace a few boards on an existing deck. However, if you’re making structural changes to the deck or tearing down the old one and building a new one, you will likely need a permit. Check with your local municipality for the regulations and rules in your area, or ask a local contractor who builds decks for advice.

Rot loves moisture, so deck rot typically impacts the parts of a board that stay wet. This includes the underside of boards, in addition to support posts and joists. However, any part of a board can rot, given the right conditions.