Hey everyone, I'm getting an interior weeping tile system put in my basement, which has a cinder block foundation. I haven't had any major water issues lately, but I did face a flood once due to a failed sump pump. To prevent future problems, I'm taking precautions before finishing my basement to ease my mind about potential leaks or moisture. The contractor plans to lay the perforated pipe with a filter sock directly on the soil, with gravel only on top and on the sides, but none underneath. When I expressed concern about this, he insisted that adding gravel below wouldn't help. I'm curious whether it's worth having at least 2-4 inches of ¾" clear stone under the pipe for an interior system, or if that's just unnecessary. I'd appreciate insights from anyone experienced in this area!
2 Answers
It’s definitely important to think about the drainage setup. For some installations, especially rigid pipes like SDR 35 or Schedule 40, having gravel underneath is crucial to prevent breaking. But, if you’re using flexible HDPE corrugated pipe, it can work fine as long as it’s installed properly. The key is to catch water effectively without needing the trench to be overflowing. Just make sure you use a good filter fabric—non-woven is best—and that your holes are facing down. I’d suggest putting that clear stone underneath; it’s worth the added peace of mind!
From what I've seen, using that black corrugated pipe for drainage often doesn’t require gravel beneath it, especially in farm fields. In your basement, though, you're right to be cautious about how low you can place the pipe. Keeping it as low as possible can yield better results, so think about that when making your decision. Good luck with the installation!
Thanks! I appreciate your input. I'll definitely keep height in mind when discussing with the contractor!
Thanks for the clarity! So you really think the stone underneath is a good move, even with the flexible pipe? I want to make sure it drains properly, but I didn’t want to overdo it.