Soft Substrate on Commercial Flat Roof? Here's What You Need to Know

Soft or spongy areas on your commercial flat roof are often signs of a deeper issue within the roof system—typically moisture that’s penetrated below the membrane and compromised the substrate. In many cases, this damage isn’t visible from above and can go unnoticed until water intrusion becomes more severe. That’s why recognizing and addressing soft substrate early is crucial to maintaining the long-term integrity of your building.

In Chicago, where fluctuating weather conditions can take a toll on flat roofing systems, soft substrate is a common issue in older or poorly maintained commercial roofs. Whether the membrane is TPO, smooth modified bitumen, or granulated, damage underneath can lead to insulation deterioration, rotting decking, leaks, and eventually structural damage if not resolved promptly.

At Anchor Point Roofing, we provide comprehensive commercial roof repair services tailored to address soft substrate problems head-on. Our experienced team begins with a thorough inspection to identify affected areas. We then remove all deteriorated substrate materials, install new sheathing or insulation as needed, and apply a new membrane system that matches the existing roofing—whether that’s TPO, smooth, or granulated modified bitumen. For smooth modified membranes, we also apply a protective aluminum coating to improve UV resistance and extend the lifespan of the roof.

We don’t just patch over the problem—we resolve it from the inside out to prevent recurring leaks and future damage. If you're experiencing soft spots on your roof or just want peace of mind, Anchor Point Roofing is here to help.

Call us today to schedule a professional inspection and get a tailored quote for your commercial flat roof in Chicago.

Service provided: Commercial Roofing

Location: Chicago, IL