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Old 10-25-2012, 07:45 PM   #1
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French Drain Pipe Material & Filter Cloth Decision

For French drain (dual-pipe) installation in heavy clay soil situation in northern CA, what are your recommendation/experience regarding the following:

1. Pipe
4" Styrene (white) vs 4" SCH40 vs 4" SDR35
It seems cost-wise, it's SCH40 > SDR35 > Styrene. Well-reputed installer claiming that Styrene performs the same as SDR35 at half cost, and used for years. I'm aware that SDR35 is thinner-walled and used for low-pressure DWV application, as compared to thicker-walled SCH40. Just not sure how Styrene compares against SDR35. Was told that white Styrene is not the black ABS (Acrylonitrile Butadiene Styrene). There is no car traffic over the path of subterranean trench, except for a section underneath concrete driveway. Is it only $0.50/ft more for SDR35 vs Styrene? Wanting to make sure it will not be bended/intruded by roots in time.

2. Filter cloth
Yay or Nay
I read various accounts of advising not lining the trench with filter cloth in clay soil installation. The reason is that clay soil will cake up the filter cloth in time when wet, therefore preventing water percolating thru gravel and reaching the perforated pipe at the bottom of the trench.



Last edited by RX8tasy; 10-25-2012 at 07:48 PM.
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Old 10-25-2012, 09:09 PM   #2
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I typically use perforated SDR-35 (typically used for a septic system leach field) with the holes down and no filter cloth. as ground water rises it is picked up by the pipe. with the holes down an sedimentation picked up will settle out of the pipe.

everyone has their preferred way of doing things ......

Good luck!



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