Hi, I want to build a concrete block wall (only two courses high) using an existing concrete patio.
1) Can I use the existing concrete patio and lay the blocks directly on them? If so, what sort of surface prep would I need to make sure the mortar will stick?
2) Or, do I need to dig and pour new footers next to the existing patio?
I live in Florida, frost footings are not the problem. The existing patio has adequte depth.
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