How much topsoil to grow grass

parafly9May 22, 2008

I want to extend my backyard out a little. I have a french drain that is covered in crush stone that currently marks the perimeter of my lawn right now. I want to excavate some of the stone, put down some landscape fabric, and then put topsoil on top and plant more grass so it's level with the rest of my yard. The other option is going over the top with soil where it is now but that would take up a lot more, be more work, and change the entire grade of my backyard.

How thick does the topsoil layer have to be? I think I might be able to get 6" of topsoil there right now. Is 6" enough for grass to grow?

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Is landscape fabric that stuff that blocks weeds from coming up but also blocks roots from going down? If so, 6" is probably a minimum. I've dug down a foot or more and still found strong grass roots. That was with KBG and/or Fescue.

Why are you putting down the landscape fabric? With 6 inches of soil, it's not likely that any seeds will germinate and grow through the 6 inches of new soil, is it?

    Bookmark   May 22, 2008 at 11:42PM
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I think he is doing that to prevent the new soil from immediately dropping lower into the gravel and sand, which I think is a good idea to keep the septic system working for awhile, but eventually I imagine that it will all drop down there, and the septic may fail. Having a septic system myself, I don't see any alternative.

    Bookmark   May 22, 2008 at 11:53PM
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Paul--Maybe I missed something, but I didn't see anything about a septic system.

    Bookmark   May 23, 2008 at 12:52AM
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No you didn't, it was me.

    Bookmark   May 23, 2008 at 2:44PM
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No septic system. I want to take the crushed stone from the top and fill it in with dirt. So underneat the dirt will be landscape fabric and hten about 2' of crushed rock. I was wondering if 6" was sufficient to grow grass on.

    Bookmark   May 23, 2008 at 4:41PM
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dchall_san_antonio(8 San Antonio)

Six inches of soil is plenty, BUT...please explain why you want to use landscape fabric. Nobody uses landscape fabric under turf, so I'm wondering why you think you should.

    Bookmark   May 24, 2008 at 1:03PM
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I'm putting it on top of the french drain to prevent it from clogging fast. You are supposed to apparently from what I've read online. IN other words i have a 12" trench of rocks and landscape fabric on top, soil on that, then grass.

This prevents the soil from going into the french drain and clogging it up.

    Bookmark   May 26, 2008 at 3:19PM
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I understand what you are trying to accomplish, the optimal way of doing this would have been to use the fabric sleeve that go around the entire pipe because it will be difficult to ensure that the fabric stays in place anyway.

If you have an opening through which to clear blockages(i.e. run a snake through ) your best option may be to make sure that the river rock in the trench is compact and in place and place top soil over top of it lightly and spead you seed. The grass will cover the trench soon enough without a lot of work and time that might not get you very much benefit anyway.

    Bookmark   May 27, 2008 at 2:27PM
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I think the pipe is in fact wrapped in filter fabric.

anyways, it's already done. The dirt is down over the drain so :)

    Bookmark   May 27, 2008 at 2:38PM
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If the pipe is wrapped in fabric then there isn't or in this case wasn't a need to put the landscape fabric over top.

    Bookmark   May 27, 2008 at 2:59PM
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i too want to grow grass, above ground on my Terrace, which is composite (plastic) boards with a 1/4" gap between that floats about 6" above a flat membrane roof which is all new construction. i was thinking that i would lay down a root barrier fabric, then a moisture mat and build it up with dirt to 7" to then grow my grass.

is this a sound plan?

    Bookmark   June 3, 2011 at 12:43PM
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