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How to Slope a Deck for Water Runoff and Drainage

When decking is installed conventionally, with gaps between adjacent boards, sloping the deck surface is not necessary. Some decking products with limited drainage recommend sloping the deck frame to a 1/4” vertical per 12’ horizontal pitch. This slope is small enough to escape detection by the naked eye, but enough to force water away from the house. In order to do this you will have to trim the structural posts by a small amount to tilt the frame slightly in the proper direction. Your footings will probably sink a little bit too which will add to the slope.


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Create a free account and get instant & exclusive access to all that Decks.com has to offer:

Checkmark 1,000+ How-To articles
Checkmark 80+ Free Deck Plans
Checkmark Deck Planning Calculators
Checkmark Free & Simple Deck Design Tool
Deck Support Columns

How to Slope a Deck for Water Runoff and Drainage

When decking is installed conventionally, with gaps between adjacent boards, sloping the deck surface is not necessary. Some decking products with limited drainage recommend sloping the deck frame to a 1/4” vertical per 12’ horizontal pitch. This slope is small enough to escape detection by the naked eye, but enough to force water away from the house. In order to do this you will have to trim the structural posts by a small amount to tilt the frame slightly in the proper direction. Your footings will probably sink a little bit too which will add to the slope.


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Deck Support Columns

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Browse some examples of decorative deck support posts for tall decks.

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Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.

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