What should I do about a drainage system for a retaining wall?

by Mary
(Virginia)

I've been talking to a contractor about building a concrete modular retaining wall. It will be an average of 3 feet tall. I was reading your page on retaining walls and you spoke of the importance of a drainage system. The contractor has not talked to me about a drainage system for my retaining wall. What should I do?

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Oct 06, 2015
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starstarstarstarstar 		True information is shared NEW
by: Polan

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Nov 19, 2009
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starstarstarstarstar 		You always need a drainage system behind a retaining wall.
by: Nancy Dransfield

Mary, I'm glad you were careful and noticed this omission. It will save you a costly repair later. Any height retaining wall needs a foundation drain and possibly a surface drain directly behind the top of the wall depending on if your site directs water towards the wall. On one of my jobs, a contractor did not price the drainage system and his reply to me was that it did not need it because it was installed without mortar and the water can weep out through the openings between the blocks. These openings are not enough! Also be sure that the modular wall being built is rated to a 3 foot height, not all of them are.

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