Flat Roof Insulation
Protect your commercial building from heat loss, poor drainage, and rising energy costs with flat roof insulation solutions from Showalter Roofing.
Strengthen Your Roofing System With High-Performance Flat Roof Insulation
Showalter Roofing delivers flat roof insulation that strengthens your entire system from the start. We use high-performance ISO board and tapered insulation strategies to improve drainage, support energy efficiency, and help your roof meet code with confidence. Whether you’re installing a new TPO membrane or adding an overlay, we tailor every insulation layer to your structure for smarter, longer-lasting protection.
Built for Better Performance, Protection, and Peace of Mind
At Showalter, we integrate ISO board insulation into many of our commercial roofing projects, including our most popular TPO installations. This rigid foam layer enhances energy performance, improves membrane durability, and helps your roof meet code requirements.
Insulation That Supports Stronger Roofing Systems
Our flat roof insulation solutions do more than retain heat or improve drainage. They strengthen your overall roofing system, reduce stress on the membrane, and extend the life of your investment. Our goal is to provide a smart, code-compliant foundation that ensures your roof can perform under pressure.
Book a Free Roofing Inspection and Insulation Assessment
Not sure what insulation your roof has or needs? Turn to Showalter to walk the roof, inspect the system, and make tailored recommendations that fit your building.
Get Transparent Estimates That Cover Every Layer
Unlike contractors who lowball bids by skipping insulation, we include it in every estimate where needed and walk you through the details. From R-values to slope design, we help you understand the materials and methods that improve your roof so you can feel confident in both your decision and your roof’s performance.
Work With Certified Professionals Who Sweat the Details
Our crews are trained, certified, and committed to delivering code-compliant work that performs under pressure. From the first inspection to the final installation, we bring precision and professionalism to every stage of your roofing project.
We’re Proud to Support Chicagoland Roofs With Smart, Long-Term Insulation Solutions
Since 1979, we’ve helped commercial property owners across Naperville, Elk Grove Village, Aurora, and beyond protect their buildings with lasting roofing systems. At Showalter, we don’t just install membrane or metal roofs—we make sure the structure underneath is designed for strength, efficiency, and longevity. From insulation and slope design to venting and warranty support, we build every roof to perform for the long haul.
Hear From Our Clients
Showalter has helped businesses across Chicagoland improve efficiency and durability through expert insulation work. Discover what our clients have to say about the difference it’s made for their buildings.
Frequently Asked Questions About Our Flat Roof Insulation
What is ISO board insulation, and why does Showalter use it for flat roofs?
ISO insulation boards, or polyisocyanurate, is a rigid foam insulation with a high R-value per inch. It’s lightweight, moisture-resistant, and pairs well with flat roof membranes like TPO or EPDM.
What’s the benefit of flat roof tapered insulation from Showalter?
Tapered insulation helps promote drainage by creating a slope where the roof deck is flat. This reduces standing water and extends the roof’s service life.
Can insulation be added during a roof overlay?
Yes, in most cases, Showalter will include a half-inch or more of insulation during an overlay installation to improve performance. Felt-backed membranes may be used when slope and insulation are already sufficient.
Let’s Give Your Roof the Attention It Deserves
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