A flat rubber roof is designed to protect your building from rain, snow, and other weather, but even the best EPDM roofing system needs proper water drainage. Unlike a steep shingle roof, a flat or low-slope roof naturally drains more slowly. If water is not directed away efficiently, it can collect on the membrane and create problems over time.
At The Flat Roof Guys, we regularly see how poor drainage can contribute to premature roof damage. Properly diverting water is an important part of protecting an EPDM rubber roof in Northeastern Pennsylvania.
Why Water Diversion Matters
Some water may remain on a flat roof after a heavy storm. However, persistent ponding water deserves attention. Standing water adds weight to the roofing system and can place additional stress on the roof structure.
Long-term ponding can also contribute to membrane deterioration, seam problems, flashing issues, and leaks. In NEPA, freezing temperatures make drainage even more important because trapped water can freeze, expand, and place additional stress on roofing components.
How Water Is Diverted
A properly designed flat roof uses several components to move water toward designated drainage points. These can include internal drains, scuppers, gutters, downspouts, and tapered insulation systems.
Scuppers allow water to exit through the edge of the roof and can direct it into a gutter or away from the building. Internal drains collect water at specific low points and route it through the building’s drainage system.
Tapered insulation can also be used beneath an EPDM membrane to create controlled slopes. Rather than allowing water to sit randomly across the roof, the slope encourages it toward drains or other designated outlets.
Keep Drains and Scuppers Clear
Even a well-designed drainage system cannot work properly if its outlets are blocked. Leaves, branches, dirt, roofing debris, and other materials can restrict water flow.
Regular roof inspections can identify clogged drains, damaged scuppers, blocked gutters, and other drainage problems before they become more serious. Commercial properties should pay particular attention to drainage because larger roof areas can collect substantial amounts of water.
Don’t Ignore Persistent Ponding
If you consistently see standing water on your EPDM roof days after rainfall, it is worth having the system inspected. The solution may involve cleaning an existing drainage point, repairing damaged components, improving the drainage path, or addressing an underlying slope problem.
The important thing is to determine why the water is not leaving the roof rather than simply treating the symptoms.
Protect Your EPDM Roof
Proper water diversion can help extend the useful life of a flat rubber roofing system and reduce the risk of expensive water damage. If you have an EPDM roof in Wilkes-Barre, Scranton, Hazleton, Bloomsburg, or surrounding Northeastern Pennsylvania communities, The Flat Roof Guys can inspect your drainage system and identify potential problems.
Call (570) 332-1223 or email office@theroofrepairguys.com to schedule an inspection.
