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woodardhsd 05-31-2013 09:11 AM

Pouring new sidewalk, drainage question
My house currently has a concrete patio on end of the back side, and on the other end of the back, there is a little storage shed attached to the back of the house. There is nothing but grass/weeds between the patio and the door now. I would like to add a sidewalk between that patio and the door to the shed, but I'm worried about water getting trapped between the foundation walls and the new sidewalk. The elevation of the patio and the bottom of the shed door threshold are exactly the same.

I've attached a image from a sketchup model I drew of that area.

The strip of grass that would be enclosed by the new sidewalk is on the north side of the house and gets no sun as it is, so I can't get any grass to grow there. I figured I would throw some decorative stone/gravel in there and use it as a place to keep our trash cans.

Is there anything I can do to keep that area from becoming a pond during heavy rains?

buzzkillb 05-31-2013 09:38 AM

We have a 1939 house with something similar. Putting a gutter along the house made the problem mostly go away. Which way does everything slope? Have the downspout from the roof exit where the water can easily drain away from the building.

woodardhsd 05-31-2013 03:52 PM

I plan to do gutters on the back eventually, but they're going to have to wait a little while. The angle of the picture makes it seem a little narrower than it it, but the strip of grass would be 4' x 14'.

There is no slope at all. The grade follows the same mortar joint all the way from the existing patio to the far side of the little shed extension.

oh'mike 05-31-2013 06:17 PM

Get a 4" drain pipe under the slab or even two---if you find the trapped ares has a drainage problem you can extend the buried pipe to daylight--if there is no need,then you have a conduit in place for some future electric or plumbing---

Cap the pipes so they don't fill with dirt until you need them.

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