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Old 10-19-2019, 03:21 PM   #1
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Adding outside drainage to an existing house


Not sure where to put this, so I'll start here.


I'm repairing my porch that's on the high side of my 100 year old house. I get water in the unfinished basement so I'm looking at how to eliminate it. I've added drains to the down spouts and this did good job of reducing the water flow (in the basement). The ground under the porch is lower than the yard and my intent is to fill the space and slope it away from the house.



Since I have access, I was wondering if it would be worth it to add a section of perforated drain pipe around the front of the house, running around to the low side of the house. I would only be able to dig down about two feet, so I'm not sure if it would help any or hurt things.


There is about 8' of house that is not covered by the porch (the highest side), this is where most of the water comes in at, then 24' under the porch.



Any suggestions?



Adding outside drainage to an existing house-img_5825s.jpg

Last edited by arcamm; 10-19-2019 at 03:24 PM.
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Old 10-19-2019, 03:58 PM   #2
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Re: Adding outside drainage to an existing house


It is always best to have a drain pipe at or just beside the footing but any drain is better than none.

stick some 10 mil poly to the concrete to send the water away from the house down to the drain.

You should post in construction about the structure of the deck.
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Old 10-19-2019, 04:11 PM   #3
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Re: Adding outside drainage to an existing house


That looks easy enough. Thanks.
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Old 10-20-2019, 08:04 AM   #4
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Re: Adding outside drainage to an existing house


If there is water flowing in from the yard, a couple of catch basins tied into the drain pipes will help keep the bulk of the away from the house.

I had a similar problem with water in my downstairs because the back of the property sloping towards the house.

I installed a drain pipe across the back of the house putting 2 catch basins in the area of most water collection.




The drain pipe continues around to the low side and onto the lowest corner of the lot ending in a pop-up diverter.



The downspouts from the house are connected to the drain pipes which keeps water from the back yard and helps flushes the drain pipe.

Since I have installed this system, I have never had a problem with flooding in my downstairs.
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Old 10-20-2019, 08:17 AM   #5
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Re: Adding outside drainage to an existing house


Those hold up OK through winter ?
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Old 10-20-2019, 09:30 AM   #6
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Re: Adding outside drainage to an existing house


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Those hold up OK through winter ?
They have been installed since 2014 and I have never had any issues.
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Old 10-23-2019, 03:26 PM   #7
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Re: Adding outside drainage to an existing house


Here's a front view of the house. The area to the left of the porch is where most of the water issue is. I've piped the down spout to the backside of the house and contorted the ground to slope away from the house. That's cured the side of the house issue.


Adding outside drainage to an existing house-westside.jpg


The plan is to add a perforated drain pipe across the front of the house, slopping from the left to the right. Then filing in under the porch, slopping the grade to the front of the house and to the right. My question is should I run perforated pipe to the porch (the uncovered area), then solid pipe under the porch or perforated all the way across?
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Old 10-23-2019, 03:36 PM   #8
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Re: Adding outside drainage to an existing house


Might not be a bad idea to change to solid pipe under the deck, if you don't think there will water there to pick, no point in dumping it there.
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Old 10-23-2019, 03:43 PM   #9
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Re: Adding outside drainage to an existing house


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Might not be a bad idea to change to solid pipe under the deck, if you don't think there will water there to pick, no point in dumping it there.

That is my hunch. There only seems to be water going under the porch when we have excessive rain and I bet that's only because ground under the porch slopes to the foundation and the mining operations conducted by the ground hogs.
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Old 10-23-2019, 03:51 PM   #10
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Re: Adding outside drainage to an existing house


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That is my hunch. There only seems to be water going under the porch when we have excessive rain and I bet that's only because ground under the porch slopes to the foundation and the mining operations conducted by the ground hogs.
We get a second solid pipe here for the downspouts and join the two pipes well down hill from the house.
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