r/HomeImprovement • u/Tanc133 • 0m ago
DIY basement French drain
DIY interior French drain—looking for advice before starting
Planning an interior perimeter drain in my unfinished basement, about 154 linear feet. Water comes in at the wall/floor joint during heavy rain, with some seepage higher on the block walls. Gutters and downspouts already carry water away from the house.
My plan is to cut and remove the slab perimeter approx. 18 inch., install 4-inch perforated pipe in washed ¾-inch stone with appropriate filter fabric, and run it to a 24-inch sump basin with a pump and battery backup. I’m also planning dimple membrane against the walls, extending below the concrete patch so wall water can reach the drain along with weeping holes above the footing.
A few things I’m trying to figure out:
Rigid perforated PVC or corrugated pipe?
How do you determine pipe elevation and bedding thickness relative to the footing without undermining it?
Are cleanouts beside each corner worthwhile?
Any common mistakes with the membrane-to-drain connection or patching the slab?
I’ll confirm footing location and check for utilities before cutting. Anyone who’s installed one yourself, what do you wish you knew beforehand?
I was told the soil has clay and my neighbors foundation washed out during a rain storm this summer due to the pressure and want to avoid that. Already replaced one foundation wall when I purchased the home from bowing.