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Old 09-29-2011, 05:11 PM   #1
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french drain install

installing perimeter drain in full basement and floor slab is even with top of footing. What is the best way to make this work


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Old 09-29-2011, 05:53 PM   #2
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The invert of your perimeter drain needs to be at least 6 inches lower than the slab, preferably more like 12 inches lower. If the footer gets in the way, simply move the perimeter drain sufficiently far from the house so the footer does not interfere with installation.


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Old 09-29-2011, 08:14 PM   #3
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think about the slope you need to reach the sump and make sure at the low end the drain is not lower than your footer (don't want to undermine the foundation!).

other things to know about install depends a lot on if your basement is already finished or has exposed foundation walls, what type of wall is it (cinderblock, stone, ICF etc.), and perhaps most importantly what problem you are trying to fix!

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Old 09-29-2011, 08:29 PM   #4
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Gotta say, I don't envy you. In 20+ years, I've never seen a basement floor that didn't sit on the footing here, only in some rigged-together crawlspace addition. I can't imagine how the floor to footing joint would ever stay in this scenario.
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Old 09-29-2011, 08:30 PM   #5
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Interior drain tile should be installed level. Water always seeks the lowest level, besides it is an "open" system because the pipe has holes at 4:00 and 8:00.Just make sure you have a couple of inches of well draining fill under the ppe to increase the effective draining area around the pipe.

Also, a filter barrier between the existing soil and the the well graded, clean back fill material (not just big rock).

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Old 09-30-2011, 04:37 AM   #6
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we use # 57 stone to bed & cover the pipe,,, IF you can create a slope to the pipe, falling water will help to keep it cleaner than a flat pipe & gravity water OR so it seems to us - 1":10' seems standard


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