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In May 2023, I had a qualified plumber install agi pipe at almost foundation level against one wall of my house to stop storm water getting under my house. The agi pipe was covered with blue metal, but it was left uncovered.
The concrete surface adjacent to the wall slopes TOWARDS, the wall where a lot of
water drains into the blue metal. That concrete surface should ideally slope AWAY from the wall into a drainage Chanel I had installed previously for that purpose.
My question is: Is it safe to have have the blue metal covering the agi pipe covered over with concrete? What is the process of doing this?
Thank you.
Welcome to the Bunnings Workshop community @harrygeria73. It's wonderful to have you join us, and many thanks for your question about concreting.
You can’t concrete over the blue metal, as it serves as a filter that allows water to drop down through to the agi pipe. Covering it would block this drainage function and could lead to further issues. One solution could be to add a raised edging along that side of the concrete slab to prevent water from running toward the wall. However, the most effective fix would be to re-grade the slab to slope away from the wall.
Since the agi pipe was installed and should be collecting the water running off that side of the house, I’m curious—are you still experiencing water getting under the house? If so, it would be helpful to know a bit more about the situation, so we can provide further guidance.
Please let me know if you have any questions.
Mitchell
