Commercial Roof Leak After a Summer Storm? Why Finding the Entry Point Is Harder Than It Looks
If you notice a drip in a drop ceiling or see water staining on an office wall after a Houston-area summer storm, it is easy to assume the leak is located directly above the damage. In reality, pinpointing the actual entry point of water on a commercial roof is much more complicated. Understanding how water travels through commercial roof assemblies makes clear why professional leak detection often prevents expensive missteps for property owners. Why Roof Leaks On Commercial Buildings Are Difficult to Trace Unlike steep-sloped residential roofs, commercial roofs in the Stafford and Houston region are typically low-slope or flat, using materials like TPO, modified bitumen, or built-up roofing (BUR). Water from summer thunderstorms may pool and, when roof membranes are compromised by age, wind, or hail, the water can exploit even tiny openings. However, water doesn’t simply drip straight down, especially with the presence of insulation and decking. The roof’s structure is complex and often layered. Water may: Enter through a punctured membrane several feet from where it finally appears inside. Travel laterally along insulation, following seams or the slope of the roof deck. Use penetrations, such as HVAC curbs or plumbing vents, as a pathway. This means a leak detected in a tenant’s space could have started at a completely different spot on the roof. How Water Moves Within a Commercial Roof System Most commercial roofs have multiple layers, such as a waterproof membrane, rigid board insulation, vapor barriers, and a structural deck (often metal). When water gets
