Good Sam Club Open Roads Forum: General RVing Issues: Slab sinking
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Missionstreet

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Posted: 12/31/22 04:35pm Link  |  Quote  |  Print  |  Notify Moderator

I have a relatively new concrete slab that is about 23 by 13'. It is built on a bit of a grade with coordinated drainage pipe underneath.

It really is two pieces, 12x13 each. I noticed the side closer to the slope sunk about 1/4" to *gasp* 1/2" near the center where they meet after backing up into it and then changing direction again. (There is a perpenducular crack in the center to so it isn't sinking evenly)

Any thoughts?

MDKMDK

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Posted: 12/31/22 07:58pm Link  |  Quote  |  Print  |  Notify Moderator

Join a DIY, contractors, or concrete pouring forum.


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time2roll

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Posted: 12/31/22 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

I would assume the base was not properly prepared. What does the concrete contractor say?


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98coachman

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Posted: 12/31/22 10:19pm Link  |  Quote  |  Print  |  Notify Moderator

You can compact the ground until you are blue in the face and you won't reach 100 % compaction. The ground will still settle! The slabs should have been pinned together to eliminate uneven heights or seperation. Good luck, it will probably keep moving.

dedmiston

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Posted: 12/31/22 11:02pm Link  |  Quote  |  Print  |  Notify Moderator

Was the pad professionally graded and compacted?


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Missionstreet

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Posted: 12/31/22 11:43pm Link  |  Quote  |  Print  |  Notify Moderator

Humm I wonder how much it'll sink

Missionstreet

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Posted: 12/31/22 11:43pm Link  |  Quote  |  Print  |  Notify Moderator

This is existing from a previous owner

bucky

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Posted: 01/01/23 03:27am Link  |  Quote  |  Print  |  Notify Moderator

Can you just live with it? It might be pretty pricey to correct.


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Missionstreet

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Posted: 01/01/23 03:30am Link  |  Quote  |  Print  |  Notify Moderator

Sure a little uneven don't bother me. As long as it's not going to move enough to cause issues.

I have heard of polylevel something. I think foam injection that lifts concrete? Maybe cheaper than other alternatives?

valhalla360

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Posted: 01/01/23 03:52am Link  |  Quote  |  Print  |  Notify Moderator

A couple potential issues:
- The base wasn't well compacted and now it's compacting. As long as it stops and it isn't pooling water badly or otherwise causing problems, I would just live with it. If it gets bad or otherwise starts bothering you, yes, you can have a residential paving company come out and use injection to compensate for the sinking.
- How thick is the concrete? 4" thick and you can expect a 12x13ft flag to crack. There's a reason sidewalks typically have a 4-5ft joint spacing.
- Are there any signs of water washing away the base material? If yes, you need to stop that or it likely will continue to get worse.


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