Deck slope for water drainage

by Brian
(Portland, OR)

What is the standard deck slope for a deck to allow water drainage?

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Jul 13, 2011
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1/4" per Foot is a safe standard
by: Editor-Rich Bergman

It depends on whether you have a completely sealed waterproof deck - in which case you should have a minimum of 1/4" slope per foot (12"). This is 2%.

If it is a standard wood deck with spacing between boards it is less of a concern because water can drain between the boards.

But you should always have a slope even on regular wood decks. 2% is great. But you could probably get away with 1" over 6' instead of 4'.


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