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For one thing, the flagstone patio with mortar joints and sealing of the stone is not meant to be permeable and allow water to seep through it.
The mason should have pitched the patio to allow water to runoff at specific lower points or into a drainage system installed when the patio was being built. When you talk about drainage system, what exactly is it? Is there any channel drains or drainage grates installed into the patio that are level with the flagstone?
In addition, was this installed on a concrete pad ( which I assume it was ) and the flagstone mortared to the concrete?
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