Low-slope roofs present a particular problem for drainage and waterproofing, especially when they intersect with an upper-story wall. If the roof is not just a roof, but also a walkable deck, the problems can be compounded. And a heavy stone or tile patio that is also the roof over an occupied space may be the trickiest problem of all.

In a previous issue, I discussed a case where we had to diagnose a leaking patio roof (“A Leaking Patio Above Living Space,” Jun/16). But in that example, my company didn’t have to repair or rebuild the patio; instead, the owners opted to cover the whole area with a new enclosed room covered by a conventional roof.

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