A well-maintained flat commercial roof drains quickly after a storm, but defects in the surface may eventually create areas where water accumulates. Standing water on the surface strains the structure and promotes problems that can lead to expensive repairs and premature replacement. Below are a few reasons to address this issue promptly. 

5 Risks of Ponding on Commercial Roofs

1. Adding Weight

Each commercial roof is designed to support a maximum weight threshold. Excessive standing water can exceed this limit. Even a shallow puddle can add hundreds of pounds to your roof, weakening trusses. It can also cause the roof to sag, which can further compound the problem. 

2. Creating Larger Puddles

Even a small puddle can depress the surface over time and create a dent that may grow every time it rains. Larger puddles accelerate the damage, turning what may have been a minor repair into a major, expensive project.

3. Promoting Plant Growth

Warm, standing water is the ideal growing environment for bacteria and some types of plants. If dirt accumulates in the puddle, vegetation can sprout. Growing roots may puncture the roof membrane and even crack the underlayment.

4. Increasing UV Exposure

Today’s flat roof solutions are highly resistant to ultraviolet radiation, but water diminishes the effect. Puddles essentially act as a magnifying glass, enhancing the damaging effects of sunlight and shortening the lifespan of your building materials.

5. Compromising Adhesives

Many single-ply products use powerful adhesives to hold the membrane in place. While these materials are watertight, they may eventually degrade under standing water. If they weaken too much, runoff can drain into your building and potentially cause thousands of dollars in water damage. Proper grading and drain maintenance are thus essential to protecting your property. 

Since 1981, ChemTech Roof & Insulation Systems Inc has been the North Carolina Triad Area’s premier choice for commercial roof installations and repairs. They use only the finest products on the market, and back every job with a 20-year guarantee on materials and labor. Get more professional tips and advice on Twitter, visit their website for an overview of their installation and repair services, or call (336) 767-4500 to request an estimate.