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I am planning to install a french drain around my garage and make a walkway on top of it. I know the overall procedure for the french drain installation but am not sure how to make a walkway over it. I am thinking of putting stepping stones (e.g., flagstones) over the gravels which would surround the drainage pipes. But, I am concerned as to whether the stepping stones could be firmly stabilized on the gravels. I could not find any article over the web on this issue.

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    I would expect that, over time, the flagstones would settle into the gravel and mostly stabilize themselves (outside of frost heave and similar issues). However, the flagstones will also block some of the surface of the french drain, and I would worry that they could reduce how quickly it can take up standing water and move it away from the foundation. How much of it do you expect to cover?
    – keshlam
    Dec 24, 2014 at 4:35

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Admittedly guesswork, but...

I would expect that, over time, the flagstones would settle into the gravel and mostly stabilize themselves (outside of frost heave and similar issues). There still could be tripping hazards, though, just as there can be with bricks after frost heave and tree roots lift them...

Note that the french drain doesn't have to be exposed through the full 360-degree circuit of the house. If there's a short section where you have a walkway, that probably won't make much practical difference, as long as the whole thing is able to drain properly.

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Flagstones do fine on top of gravel or sand.

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