then you install new decking boards on top of the new joists, leaving the old concrete concealed under the new decking. this really depends on the size of the old concrete patio and how much you have to span.
for information on installing a new patio, see pouring a concrete slab. building over an existing slab if you are building an overhead to cover an existing patio, you must first determine if local codes allow setting it directly on the slab and, if so, is the concrete thick enough to support the weight.
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