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Leveling Ponding Areas

Flat and low slope roofs are designed to accommodate the mechanical equipment that is needed to operate the business below.  In Southern California, we also see a lot of Spanish bungalow and beach homes that favor flat roof systems.  Most low slope and flat roofs conform to standard levels of slope to insure proper drainage but unfortunately, standing water still occurs on many commercial and residential flat roofs.

Commercial Roof CleaningExcessive water that accumulates on the low-lying parts of a low slope or flat roof is referred to as “Ponding Water.”   Many customers think that weather is the cause of ponding water on their roofs but we have found that ponding water may also result from other water sources such as leaking cooler lines and pans, AC-condensate and similar sources.

Ponding Water Adds Stress to the Structure of Your Roof

Every year in San Diego, flat roof buildings are extensively damaged by ponding water.  Excessive water on your roof can seriously increase the load on your roof assembly and compromise the structural integrity of your roof deck.  Water weighs about 5 lbs. per square inch of roof surface.  A large accumulation of water on your roof could be the equivalent of having a tanker truck on your roof.

Membranes Designed to Protect Your Roof Can Be Damaged

Low slope and flat roof systems contain membranes that are intended to be water-impermeable coverings.  Pooling water creates hydrostatic pressure that forces water into even the tiniest pinhole imperfections and potentially causes damage the entire roof system.  In addition, debris accumulation, vegetation, fungal growth can quickly cause membrane damage, water leaks and destroy the reflectivity of applied coatings.

Resolve or Avoid Problems Associated With Ponding Water

Flat roof systems that are properly designed and built to ensure positive drainage can virtually eliminate problems with ponding water. Sully Jones Roofing can also optimize your existing flat and low slope roof to resolve existing ponding water issues.

When Sully Jones Roofing installs or repairs a low-slope or flat roofing system, we consider not just the nominal slope, but also the structural framing, deck type, construction tolerances, expected deck deflection, drain locations, overlay material, membrane type, penetrations, potential blockages and overall roof layout.

We will address every factor contributing to Ponding Water in order to determine the optimum drainage – whether a new or replacement roof system is needed.  Sully Jones Roofing will resolve your ponding water issues by removing debris and opening up existing drains, installing new drains where needed, sealing HVAC ducts and plenum joints, repairing compromised roof areas and  re-sloping where necessary.


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