Q&A for How to Install a Drainage System Around the Foundation of a House

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Which way should the holes be facing on the pipe?

Community Answer

They should be facing down. If the holes face up, then silt will eventually fill the pipe. Also, with the holes down, the drainage from the pipe begins at the lowest level (bottom) of the pipe instead of at the top of the pipe; a 4" difference in water removal depth.

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Question

If holes are on the bottom of the pipe, what keeps the water in?

Andrew Trenholm

Community Answer

The holes are on the bottom left and right (do not set a line of holes straight down). Between the holes is just enough gutter (usually about 1" inch high) that works just perfectly for sending water down the pipe.

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Question

It seems like removing the soil from the side of my foundation would upset the structural integrity. How deep should I dig below the level of the foundation?

Community Answer

Your pipe needs to be 3 inches below the foundation's footer. Nothing to worry about; most of the house was built on the foundation before the dirt was put against the foundation.

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Question

Can you post a picture of the proper installation of the drainage pipe to the sewer?

Community Answer

It doesn't go to the sewer, it empties onto a lower point of the yard or out into the street.

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Question

How do I unclog these kinds of drains?

Community Answer

Like any other plumbing system: there are access points so they can be snaked and rinsed out thoroughly.

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Question

Does the perforated pipe need to "run" downhill for proper drainage?

Andrew Trenholm

Community Answer

Yes. The pipe fills with water and goes down towards where you have chosen to have it come pouring out.

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