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What To Do With Rocky Backyard?

Posted on 8/4/24 at 8:11 pm
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/4/24 at 8:11 pm



When they were cutting in my home site we discovered that the rear of my house/backyard was on a slate shelf. The front yard is good soil but the shelf began where my backyard starts. They've pulled up chunks as large as a beach ball. It's brittle and breaks easily but it's literally a slate pit. Grass will will never grow here and I'm certain sod would never establish.

How much topsoil is needed for grass to grow? Sod? I'm considering digging the slate deeper and then filling around the house with topsoil. Would this work? Any other ideas? Seems like a lot of work but I have to have a back yard.
Posted by calcotron
Member since Nov 2007
9393 posts
Posted on 8/4/24 at 8:29 pm to
From now on I'm going to stop saying my yard is rocky. You win.
Posted by Dallaswho
Texas
Member since Dec 2023
2649 posts
Posted on 8/4/24 at 8:44 pm to
I don’t know what to do, but when I chop up tree stumps, I need to get at least 6” below ground. At 4-5” the Bermuda above the stump will occasionally completely go brown then recover in a couple weeks.
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/4/24 at 8:59 pm to
I posted a similar question on here a while back but wanted to post pictures to show the scope of rock I’m dealing with. Someone said Palisades Zoysia would grow on slate. Can anyone confirm? How much dirt for it?
Posted by Hobie101
Member since May 2012
714 posts
Posted on 8/4/24 at 11:01 pm to
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/5/24 at 6:15 am to
I’d be cool with it but my wife wants our 2 and 4 year old to have somewhere to play.
Posted by BoogaBear
Member since Jul 2013
6483 posts
Posted on 8/5/24 at 8:19 am to
Depends on how much you want to spend. The more good soil you have the better for the grass. The Palisades will grow on a few inches of top soil, but you will have issues with drought and watering.

The best way would be to dig it down about a foot, fill dirt, then about 4-5 inches of top soil, then sod.
Posted by Hobie101
Member since May 2012
714 posts
Posted on 8/5/24 at 10:03 am to
quote:

I’d be cool with it but my wife wants our 2 and 4 year old to have somewhere to play.


I hear that. Good luck with it! Looks like a fun project with some potentially cool landscaping!
Posted by Wtodd
Tampa, FL
Member since Oct 2013
68166 posts
Posted on 8/5/24 at 10:09 am to
quote:

What To Do With Rocky Backyard?

Add Bullwinkle
Posted by cgrand
HAMMOND
Member since Oct 2009
43394 posts
Posted on 8/5/24 at 11:44 am to
is this in Alabama?
I’m not sure what your options are it may be crazy expensive to excavate all that. I would get a test bore done before you do anything though and see how thick that shelf is. And make sure you don’t inadvertently destabilize the hillside (if that’s what that is)
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/5/24 at 12:38 pm to
quote:

is this in Alabama?


North Georgia

quote:

make sure you don’t inadvertently destabilize the hillside


The hill stops where the skid steer is sitting so only about 5' high. Picture doesn't show but it's a gradual incline and not that steep

quote:

may be crazy expensive to excavate all that


My graders are still on site. Says it wouldn't cost that much since I have all the fill and top soil on my property that I'd need. He's supposed to be getting me a price. He seems to think I'd only need to cut down an additional 3-4" but everyone in here is saying different.
Posted by BoogaBear
Member since Jul 2013
6483 posts
Posted on 8/5/24 at 4:47 pm to
quote:

cut down an additional 3-4"


It depends on what is 3-4" down. If you need to excavate 3 more inches to get to decent dirt then sure. If you're just cutting it down 3 inches and it's still rock you have the same issue.
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/5/24 at 5:12 pm to
quote:

If you need to excavate 3 more inches to get to decent dirt then sure


His thoughts were to cut down an additional 3-4" then backfill with top soil then sod.
Posted by cgrand
HAMMOND
Member since Oct 2009
43394 posts
Posted on 8/5/24 at 6:40 pm to
that sounds like something a home builder would say
water is going to perk to the shale bed… if it can’t drain, it’s going to sit there like in a pan under a potted plant. Make sure you have good positive drainage or you are going to wind up with a bog
Posted by GAFF
Georgia
Member since Aug 2010
2607 posts
Posted on 8/5/24 at 8:38 pm to
quote:

water is going to perk to the shale bed… if it can’t drain, it’s going to sit there like in a pan under a potted plant


This is actually something I've been watching and still haven't figured out. We had 15 straight days of rain here recently. Pretty heavy rain at times. There was never any puddling on the slate. They continued grading on the first day without rain because it was so dry. I rode up cause I was sure they were making a mess but even where they were digging was dryish. It's like the rain water drained between the rocks or something? I'm sure some drained away but the area is pretty flat and it should have held a good bit between the low points. I have no idea where it drained.
Posted by baldona
Florida
Member since Feb 2016
22463 posts
Posted on 8/6/24 at 5:32 am to
Do you have neighbors? What are they doing? Pictures aren’t the best so it’s hard to tell, maybe worth contacting a landscape architect.

I don’t think you’ll need a lot of dirt the issue would be drainage as said but with a tractor on site that’s fairly easy to work on now also. I would do a little more than 3’’ to be safe. Maybe talk to a local garden center to see who they recommend in the area?
Posted by WhiskeyThrottle
Weatherford Tx
Member since Nov 2017
6510 posts
Posted on 8/6/24 at 9:51 am to
How much land are we talking back there?

I've learned that if you're sodding, you'll absolutely want irrigation and you'll need at least a foot of trench to bury the lines and that rock might pose a bit of a problem with that.
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