Let’s be honest; decks built over dwelling areas are an architectural design nightmare. Waterproofing contractors will tell you that the most difficult problems they experience are leaks resulting from decks built over lower-level dwelling or garage areas. These leaks are difficult to diagnose because there is commonly more than one source of moisture entry, and troubleshooting the leaks can become quite complicated.
Of the more than 700 managed properties my company services, more than half have second-story patio decks. Most of these decks are built over bedrooms, living areas or garages. All of our properties with this design scenario may experience leaks during storms.
One common misconception about such leaks is that they originate from failure of the decking membrane. In fact, membrane failure ranks fourth on the list of sources of moisture intrusion. Having repaired thousands…