Originally Posted By: roconnor
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An interior french drain system should consist of perforated pipes run below the floor around the perimeter of the foundation along the inside face of the wall, which then discharges into a sump pit/crock with an electric sump pump or a gravity drainage system. The pipe may be below a slab or there may be a ring of gravel around the perimeter ? but it sounds like it's may be in finished space and therefore covered. Penetrating water is then directed into the pipe to the sump pit, and may be pumped out with a discharge pipe or directed into an underground drainage system.
These drain systems are used sometimes in the Long Island area ... usually for areas/sites with seasonally high ground water, perched ground water, or underground streams. They can be used sometimes to fix a wall leak from rainwater, but that?s not always the best solution (particularly for a finished space) ... which is to prevent the water from getting inside to begin with if possible. Depending on the situation, that may involve fixing/sealing any cracks/seams and installing waterproofing and drains on the outside.
Check the site/roof grading and drainage, and if you see a sump pump wet test it for operation and check for silting/clogs. Plus look for signs of continued water penetration or damage. The "controlled leak" fix may be a home sale band-aid that could still be allowing damage.
I noticed that we are actually pretty close, so if you need an engineer for a further evaluation feel free to drop me a line ... It's one of my specialty areas, along with general site, foundation, and structural evaluations and repair designs ... ![icon_wink.gif](upload://ssT9V5t45yjlgXqiFRXL04eXtqw.gif)
Robert O'Connor, PE
Eagle Engineering ?
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NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong