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neech7

07:30AM | 07/25/02
Member Since: 03/19/02
7 lifetime posts
Bvlawn
I want to build a small retaining wall along the sides of my conrete patio with blocks but am concerned about drainage (I live in the Pacific NW).

I have read up multiple articles and talked to different folks and they all seem to have slightly different opinions regarding drainage. Some say to backfill with 6" wide of gravel, but others said to also have drainage pipes in addition to gravel.

My question: are drainage pipes really necessary? If I only have gravel with no pipes, what happens to all the water after it sinks down to the bottom of the gravel?

The wall will not be over 2.5 ft at its highest point and will be only .5 ft high at its lowest point. The wall curves and "wraps" around two sides of the patio and it will be about 30-40 ft in total length. Also, since the patio is attached to the house foundation, one end of the wall will be touching the foundation.

Thanks for any advice you can give me.

rpxlpx

02:58AM | 07/26/02
Member Since: 03/13/00
1675 lifetime posts
When you say "retaining wall" are you planning to add soil to one side of it? I'm assuming you do not currently have a drainage problem. If you're not going to build up on one side of the wall, why not just include several drain holes in the wall at ground level?
Have I misunderstood the question?

neech7

06:15AM | 07/26/02
Member Since: 03/19/02
7 lifetime posts
There is currently a slope with my patio sitting on top of the slope. I would like to build this wall at the bottom of the slope and backfill it with dirt to level it out.

I guess I will drill some holes near the base of the wall to let water run out as you suggested. Thanks for the advice!!

neech7

06:18AM | 07/26/02
Member Since: 03/19/02
7 lifetime posts
Also, to answer your question, I don't currently have a drainage problem, as far as I know, but this house was completed just a month ago and it has not rain that hard yet, thanks.
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