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Hi, I'd like some ideas for material to use to waterproof a drain. Concrete slab poured next to house. Rectangular hole in concrete, against house, filled with gravel.

Water faucet and sprinkler valves drain into gravel pit. I installed a drain before pouring concrete, and I want the water to drain out, and not drain under the foundation. Since there are sprinkler pipes coming up through the ground, I don't want to cover the entire pit with concrete, but leave them accessible should I ever need to fix a leak or re-plumb something. I want to fill the pit half way with sand, then cover the sand with liquid rubber, tie that into the drain and sides, making a waterproof bowl, and fill the rest with gravel. Do you think this will work? What type of liquid rubber should I use, where do I buy it? The picture is what I am digging out.

I am replacing the valves and raising them to be above the flower bed level. I am replacing the electrical conduit and moving the junction box above ground level. I am replacing the controller with a similar model with more zones. Short answer, No, it won't work. Trying to put the rubber membrane on top of the sand is going to be a complete mess.

You'll never get anything like liquid rubber form a good membrane. Your only hope might be to use a sheet of thick rubber like it used for pond linings cut to shape and then use your liquid rubber to seal the edges and around the pipe. Why don't you just put a concrete floor in that pit so the water goes to the drain and then build a cover to go over the pit? The concrete wouldn't have to be very thick so you could just chip it out if you needed to do the repair work. Ndrive Map Serial Number. That would keep excess water out and let any water that gets in the pit drain. I bought some pond liner and seam tape. But, the mortar and foam around pipes does seem very appealing.

Maybe I should return the pond liner, and buy some mortar instead. I see a variety of mortar premixes at lowes and homedepot, most are for thinset / tile type application, some are for brickwork, some polymer modified. The strength varies from 12lb to 90lb. For my use I assume the actual type does not really matter, and the weaker the easier to break open later? Should I put a cloth barrier down to make it easier to apply without getting the dirt mixed in?