There is concrete caulk for gaps up to 1/4"
There is concrete crack filler for up to 1/2"
The gap is now 1" in some places but less in other places.
I can see where the builder used felt to separate the foundation from the concrete slab so at least the patio shifting away from the house will not cause a problem. Should I just use the crack filler or is there something else I should use in the gap?
You could use Expansion Joint filler. BUT, you want to prevent any additional movement. As I can see from here, the slab is still moving. THat means that whatever you do now will be for not later on.
If the pad is just sitting on the 'ground', that could be why. Stop the movement first, and see if it continues to move. Take some measurements (after your fix) and wait 4 seasons. If there's no movement, then 'fill' the gap.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!
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