Ponding water can occur on all roof types. This can lead to multiple issues, ranging from leaks to mold growth. Ponding water on a flat roof is especially commonplace. We’ll discuss why this is so and what you can do to minimize water buildup.
What Causes Ponding Water on a Flat Roof?
Ponding water is defined as a puddle that remains on a roof for more than 48 hours. Ponding is typical on commercial roofs, since these tend to have flat surfaces, unlike residential roofs with a sharp slope.
There are two main culprits of ponding water on a commercial roof: building degradation and deck deflection.
Flat roofs have multiple layers of hot asphalt, roofing paper, and gravel. The gravel is the outermost layer. This is also the part that withers over the years from UV ray exposure. The eroded gravel leads to a recessed section that enables water accumulation.
Deck deflection occurs from excess rainfall. The weight of the water puts undue stress on the support beams, causing them to bow downward and forming a declivity. Like degradation, this creates a recess that allows water to collect. Deck deflection typically happens smack in the roof center.
Once the water evaporates, the beams may return to their original position. However, the declivity may become permanent if deflection takes place repeatedly.
We’ll Repair Your Commercial Roof to Prevent Water Ponding
Contact Urbizo Bros Roofing so we can examine your roof and determine if it’s susceptible to ponding. Don’t wait until water begins accumulating on the surface to do something about it. Our services include long-term solutions for minimizing water ponding on a flat roof.
Commercial Roof Repairs to Keep Ponding Water at Bay
Quality roof replacement & repair in Edmonds, Seattle, Lynnwood, Mill Creek, Mercer Island, Mukilteo & South Everett