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Old 08-11-2019, 11:46 AM   #1
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Retaining wall needed


I am in the process of building a pager patio where deck was just taken down. The area is about 30inches below where the patio top will sit. I will add full diet to get to the correct level. I have read in places where I have to have a slip of about 35 degrees to not need a retaining wall. Is this the correct amount.

My idea is to add 6inches to a foot of level ground before the slope and to put some big rocks on/into the slope to assist in holding up the area.

Is there any reason this will not be sufficient?
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Old 08-11-2019, 06:02 PM   #2
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Re: Retaining wall needed


Ayuh,...... I'm confused by yer post, 'n can't see in my minds eye what yer talkin' about,.....

Full Diet,..??
A 1' on 1' grade will hold itself,...... that's 45*,.......
I'd put the big rocks at the bottom, 'n yer dirt behind/ above 'em,.....
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Old 08-11-2019, 09:00 PM   #3
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Re: Retaining wall needed


What are you planning on using for fill? It's going to have to be very well compacted and ideally left over the winter to settle with rain and time.
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Old Yesterday, 12:59 AM   #4
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Re: Retaining wall needed


Not much info, so just thinking about generalities here. Pics and more details?

The slope anything closer to 0 from 45d is increasingly better. But I would think the amount of room you have would dictate that. If you have real sandy soil it will slump a little. I don't see how rocks placed here and there would stabilize a slope, if full rocks then that's like a retaining wall (irony?).

If you are raising the grade 30" by shovel and wheelbarrow, to equal where the deck height was before, it will settle a lot. Don't know how big an area, but you need some compaction. A skidsteer or driving a truck over it in lifts.

Did your deck have a railing? With only a 6"-12" grass (?) ring beyond the pavers, will there be problems scooting chairs off or toddlers rolling? I'd probably want more like 24" because the transition to slope will have a radius (I sometimes consider a mower width when deciding length of level or slope before a transition to each).
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Old Yesterday, 05:58 AM   #5
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Re: Retaining wall needed


Appears the OP is using TapaTalk with autocorrect..



Quote:
Originally Posted by Nefarious View Post
I am in the process of building a pager patio (pavered patio) where deck was just taken down. The area is about 30inches below where the patio top (top of pavers) will sit. I will add full diet (fill dirt) to get to the correct level. I have read in places where I have to have a slip (slope) of about 35 degrees to not need a retaining wall. Is this the correct amount. (?)

My idea is to add 6 inches to a foot of level ground (fill dirt) before (at the base of ) the slope and to put some big rocks on/into (on top of) the slope to assist in holding up the area.

Is there any reason this will not be sufficient?
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Old Yesterday, 12:15 PM   #6
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Re: Retaining wall needed


Obviously not well written or proof read

I am just in the planning stage, just trying to figure out the parameters.

Some detail, true at least until I find it wont work.

The area is a 20' x 25' paver stone patio which will be 31" off of the current compacted ground level.

I, or someone, will put in fill dirt delivered to the area with a bobcat.

My plan was to put it down in 4 courses, each leveled and compacted and then wet down and compacted again.

All I want to know is if I have a 35 degree slop up to the area, is there any need for a retaining wall. If I add some big rocks, the height of the area, embedded in the slope, will this assist in retaining the area?

Based on the replies to the poorly worded post, I think I know the answer.
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Old Yesterday, 01:42 PM   #7
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Re: Retaining wall needed


Since heavy rains play havoc on flat rocks laying on a slope = leaving run off debris on patio too often. You may want to consider one of these short heigth, locking type block retaining walls in the pic.

UTOOB is full of videos how to install them. Some even without pouring expensive footers while showing how to install the block, drain pipes, rock, etc. Good Luck. JMO
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Old Yesterday, 08:33 PM   #8
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Re: Retaining wall needed


Quote:
All I want to know is if I have a 35 degree slop up to the area, is there any need for a retaining wall. If I add some big rocks, the height of the area, embedded in the slope, will this assist in retaining the area?
Nope, not really,..... at 35*, it shouldn't move anyways,......

If yer in an area that sees frost,.... the rocks will pump up each year, gettin' higher, 'n higher, til they're no longer fill, but big ole bumps,.....
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Old Today, 01:55 PM   #9
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Re: Retaining wall needed


@Bondo

I do not have a frost problem. I have what could pass as a retaining wall with rocks that are on the order of 1'x1'x1' and haven't moved in over 20 years.
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Old Today, 02:19 PM   #10
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Re: Retaining wall needed


We see walls like this all the time, over 3 ft they need to be engineered but they work fine.

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Old Today, 06:46 PM   #11
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Re: Retaining wall needed


Quote:
I do not have a frost problem.
Ayuh,...... No frost,...... No problem,.......
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