one of the many cons of this type of patio.
In the construction of these patios, sand is the key to maintaining level. I mean like 6 inches or more of compressed, watered down sand.
Remember the thing about soils, especially clay mixture. When the soils are wet, they expand or heave, when dry, they shrink and fall.
If your heaving settles down is hard to say and I won't. If it does not, then you might want to take up a section and do some studing.
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