The french drain according to the original drawings is a 4" collector pipe with 1/4" holes, encapsulated all around with 6" of course concrete aggregate and another layer of 6" fine concrete aggregate. I find it difficult to fathom the french drain would wick that much soil down the pipe, if it...
While renovating a 23 year-old building, I found significant voids under the first floor slab on grade along a basement foundation wall(the first floor is larger then the basement). The building drawings show a french drain following the basement walls, which is directly under the portions of...
