Slope Under Deck

 
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Old 05-30-2017, 01:26 AM   #1
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Slope Under Deck


Got a heavy slope under a deck I'm building. Owner did a cut and fill to level the yard. We're building deck past the slope. Slope is 4 ft drop over a span of 8 ft. Id say 40 degrees or so. Any recommendations to avoid erosion over time. Weed back and 6 mil plastic are the only things I've come up with at this point, but wondering if that's really enough. Thanks!
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Old 05-30-2017, 01:48 AM   #2
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Re: Slope Under Deck


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Got a heavy slope under a deck I'm building. Owner did a cut and fill to level the yard. We're building deck past the slope. Slope is 4 ft drop over a span of 8 ft. Id say 40 degrees or so. Any recommendations to avoid erosion over time. Weed back and 6 mil plastic are the only things I've come up with at this point, but wondering if that's really enough. Thanks!


Retaining wall.



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Old 05-30-2017, 01:55 AM   #3
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Re: Slope Under Deck


Yea it's too late for that. Posts are set onto footing that were already placed at bottom of slope. Most we can go up with a wall is 16" without covering the 6x6 posts. Can anything be put on the slope instead? Its not going to grow vegetation under there?
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Old 05-30-2017, 01:58 AM   #4
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Re: Slope Under Deck


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Yea it's too late for that. Posts are set onto footing that were already placed at bottom of slope. Most we can go up with a wall is 16" without covering the 6x6 posts. Can anything be put on the slope instead? Its not going to grow vegetation under there?


Plastic isn't recommended. Possibly some burlap cloth or something along that line. Gravel on top that.



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Old 05-30-2017, 02:00 AM   #5
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Re: Slope Under Deck


Something like this. It's used for erosion control.

https://www.amazon.com/dp/B01634ISRS...a-309781384492



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Old 05-30-2017, 02:01 AM   #6
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Old 05-30-2017, 02:02 AM   #7
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Re: Slope Under Deck


Ok, no plastic then. But gravel will definitely not stay on this slope, will tumble right down unfortunately. Landscape staples may be the only thing to hold it down
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Old 05-30-2017, 02:04 AM   #8
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Re: Slope Under Deck


Thank you, i did see those burlap sheets but questioned if they were worth it bc I read they were biodegradable.
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Old 05-30-2017, 02:12 AM   #9
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Re: Slope Under Deck


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Thank you, i did see those burlap sheets but questioned if they were worth it bc I read they were biodegradable.


They are, but so is everything else, including plastic. The stuff at least deteriorates back into the ground vs. other cloth that crumbles and blows black confetti everywhere. Also it's thicker.



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Old 05-30-2017, 02:14 AM   #10
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Re: Slope Under Deck


There really needed to be a retaining wall built first. At this point you have a slope that will require maintenance.



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Old 05-30-2017, 02:15 AM   #11
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Re: Slope Under Deck


Gotcha, thank you very much. Worst case it has to be replaced every season or so, it will at least prevent any movement. Thanks again
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Old 05-30-2017, 02:21 AM   #12
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Re: Slope Under Deck


Yea the lack of wall was a major screw up. After the dig the owner didn't want to pay for a 60 ft long retaining wall. He wanted the hill covered as much as possible by a deck and that was that! I'm left figuring it out
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Old 05-30-2017, 05:59 AM   #13
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Re: Slope Under Deck


Not sure what your location is, but besides soil erosion with a drop like this... you should also make sure your footings confirm to R403.1.7 Footings on or Adjacent to Slopes to be withing code compliance which specifies the placement of buildings and structures on or adjacent to slopes steeper than one unit vertical in three units horizontal (33.3-percent slope) shall conform to Sections R403.1.7.1 through R403.1.7.4.
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Old 05-30-2017, 08:03 AM   #14
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Re: Slope Under Deck


Greg this is in Connecticut. Let me review that code and be sure.
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Old 05-30-2017, 03:01 PM   #15
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Re: Slope Under Deck


How deep did you put your footings?
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Old 05-30-2017, 03:28 PM   #16
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Re: Slope Under Deck


Because it was at bottom of the hill o extended sonotubes. Theres between 52"-55" under gound. 10" footings.
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Old 05-30-2017, 11:51 PM   #17
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Re: Slope Under Deck


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Because it was at bottom of the hill o extended sonotubes. Theres between 52"-55" under gound. 10" footings.
What is a 10" footing
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Old 05-31-2017, 12:19 AM   #18
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Re: Slope Under Deck


Terrace it off with a coventry wall or similar and fill with decorative gravel.

https://www.ephenry.com/products/wal...coventry-wall/
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Old 05-31-2017, 08:49 AM   #19
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Re: Slope Under Deck


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Terrace it off with a coventry wall or similar and fill with decorative gravel.

https://www.ephenry.com/products/wal...coventry-wall/



Actually that's what one thing we were thinking of doing. Good point. People do these things then I have to go play damage control!
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Old 05-31-2017, 08:57 AM   #20
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Re: Slope Under Deck


Quote:
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Quote:
Originally Posted by Rob77 View Post
Because it was at bottom of the hill o extended sonotubes. Theres between 52"-55" under gound. 10" footings.
What is a 10" footing

Lol, 10" diameter. Did you think I went 10" down?

Footings are 60". About 52"-55" below grade.

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