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<body lang="EN-US" link="#0563C1" vlink="#954F72">On Tue, 07 Jul 2015 18:54:28 -0400, Martha Beddoe <mebeddoe@twcny.rr.com> wrote:<br><br><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><div class="WordSection1"><p class="MsoNormal"> Is it reasonable to expect that one can dig up part of a French drain, install the necessary piping, then return the drain to its previous condition and have it continue to function?</p></div></blockquote><div><br></div><div><big>Martha;</big></div><div><big><br></big></div><div><big>Short answer : "Sure. Easy as pie."</big></div><div><big><br></big></div><div><big>Longer answer: "French drain" can mean different things to different people.</big></div><div><big><br></big></div><div><big>As a "for instance" ... </big></div><div><big><br></big></div><div><big>I knew a French fellow who told me that where he hailed from (Maritime Canada) when building a foundation that sits directly on bedrock (as is the case in my neighbourhood and my home as well) a "French drain" was made by fracturing the bedrock around the perimeter of the foundation so that water could be drained away. It's not an approach that I would have come up with nor do I think that it's something I'd do.</big></div><div><big><br></big></div><div><big>If your idea of a French drain is more along the lines of an excavated trench down to the footings of the foundation, walls of the excavation lined with geotextile fabric to prevent migration of fines into the washed, coarse stone that fills the excavation, with a perforated drainage tile placed next to the footing, embedded in the stone ballast, then that's what is typically used for most foundations around here.</big></div><div><big><br></big></div><div><big>If, in digging your drain up to install the piping for heating system, the perforated tile (drainage piping) gets destroyed then inserting a new replacement piece and connecting it to the remaining tile isn't a big chore and the system should work just like the uncut tile prior.</big></div><div><big><br></big></div><div><big>Nor is replacing any washed stone ballast that may have had to be dug out or replacing filter fabric that got torn up/out.</big></div><div><big><br></big></div><div><big>All of the above doesn't require any fine detail work and would be pretty difficult to screw up. </big></div><div><big><br></big></div><div><big>While you have the foundation exposed, it would be a good opportunity to install a dimpled plastic membrane over the <br></big></div><div><big>foundation waterproofing to minimise hydrostatic pressure at the drainage plane.<br></big></div><div><big><br></big></div><div><big> https://www.armtec.com/product/platon-foundation-wrap/<br></big></div><div><big> </big></div><div><br></div><br><br><div id="M2Signature"><div>-- </div><div>=== * ===<br>Rob Tom DT7-64 <br>Kanata, Ontario, Canada</div></div></body></html>