How to Install Decking with Proper Ventilation – Video

June 4, 2014 2:33 pm
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Proper Deck Ventilation – How to

Proper deck ventilation with hardwood decking is crucial. If you install your decking without proper ventilation it’s a recipe for disaster. The decking can be ruined. Watch this video to learn the best way to install your decking so proper ventilation isn’t even an issue and you’re left with a beautiful deck you can enjoy.

If you install decking with gaps that are too narrow, or don’t leave enough gap spacing at all, you will block the airflow from under your deck. Restricted airflow will lead to the deck boards cupping. Narrow gap spacing also increases the chance that leaves and debris can accumulate and constrict water runoff.

When it rain, water will pool on your deck which can lead to structural issues like cupping, checking, and mold. To prevent structural problems, follow these general installation guidelines.

Start by creating a slow of soil underneath the deck that starts away from your home. Ensure the deck substructure is pitched at an angle to allow for adequate water runoff. We recommend a pitch of ¼” per ten feet for proper drainage.

When spanning the joists and laying out the decking, you must ensure even gap spacing. Gap spacing between boards can range from 3/32” to ¼” depending on the fastening method you choose.

We also suggest a minimum of six inches of open air under the joists along with open sides for cross ventilation. Proper ventilation allows air from the surrounding area to flow under the joists and up through the gaps between the deck boards.

Also, you must consult with your local building departments for up to date building codes.

At we do everything in our power to give you the best chance of having a successful and safe do it yourself hardwood deck installation.

For more information on proper deck ventilation visit us at