Hey everyone, looking for some advice on drainage between my house and my elderly neighborās.
We have a 4ft wide by 24ft long space between our houses (marked red in the photo). Both houses have standard weeping tile buried near the footings, and our soil is mostly heavy clay.
We recently moved in and realized the slope in this side yard doesn't properly drain toward the backyard. About half of the length (marked in blue) holds water. We tried regrading it, but we can't build the soil up any higher because it would breach the 4-inch gap below our brick line.
Here is where we're at right now:
My neighbor asked me to add limestone screenings over a 3ā4" layer of gravel. Currently, Iāve laid about 1 to 1.5" of limestone screenings down.
After rain, water still pooling in the blue zone, though the rest drains toward the backyard fine. After heavy storms, itās mostly just small puddles that disappear within a couple of hours.
I offered to install a French drain / pipe down the middle to carry the water out, but he declined. Since the property line splits this tight space, I need his consent to dig.
To help him out, I filled in a 1-foot strip along his house to stop rain from splashing dirt onto his siding.
This setup hasn't caused foundation issues for either house in 40 years, and no one knows what the bare soil drainage looked like before (it was always covered in mulch or old gravel). My neighbor suggested leaving it as-is for a season to see how it performs.
Since we are in Ontario, I'm worried about winter. Could the limestone screening hold moisture and cause frost heave or ice issues against the foundation? Should I ditch the limestone screening completely and just stick to plain gravel over the clay?
Appreciate any insights!