Residential Flat Roofing in St. Louis — TPO, PVC & Modified Bitumen
Flat Roofing Isn't One-Size-Fits-All
St. Louis Flat Roofing
Ensuring your flat roof looks and functions at its best.
Flat and low-slope roofs show up on more residential homes than most people realize — additions, porches, garages, sunrooms, mudrooms, and increasingly, rooftop decks and patios. But “flat roofing” isn’t a single product. The right system depends on how that roof is used, how much foot traffic it sees, and what kind of budget and lifespan you’re working with.
IES Construction & Roofing installs three of the most trusted flat roofing systems on the market — TPO, PVC, and modified bitumen — and helps homeowners choose the right one for their specific project, not just whatever is easiest to install.
TPO Roofing
TPO Roofing — The Reliable, All-Around Choice
TPO (Thermoplastic Polyolefin) is one of the most widely used flat roofing materials today, and for good reason. It’s a single-ply membrane that’s heat-welded into one continuous, watertight surface, with a reflective white or light-colored finish that helps reduce heat buildup in the summer months.
Ideal for: TPO is a great fit for most residential flat roof applications — additions, garage roofs, porch roofs, and low-slope sections of a home that don’t see regular foot traffic. It offers a strong balance of durability, energy efficiency, and value, which is why it’s become the standard choice for the majority of flat roofing systems.
PVC Roofing
PVC Roofing — Built for High-Traffic Roof Decks
PVC (Polyvinyl Chloride) membranes share some similarities with TPO — both are heat-welded, single-ply systems — but PVC is known for its strength, chemical resistance, and ability to hold up under repeated foot traffic and weight.
Ideal for: PVC is the right choice when a flat roof is going to be more than just a roof — think rooftop decks, patios, or any area where people will be walking, placing furniture, or spending time regularly. If you’re planning a roof deck system or an outdoor living space above a flat-roofed section of your home, PVC gives you a membrane that’s built to handle that kind of use without breaking down over time.
Modified Bitumen
Modified Bitumen — A Proven, Budget-Friendly Option
Modified bitumen (often called “mod bit”) is a multi-layer system that combines asphalt with rubber or plastic modifiers for added flexibility and durability. It’s been used on flat and low-slope roofs for decades, and it remains a dependable, time-tested option.
Ideal for: Mod bit is a great fit for homeowners looking for a reliable flat roofing solution at a more accessible price point. It performs well on standard residential flat roof applications and offers a proven track record — making it a smart alternative when TPO or PVC may be more than the project calls for.
Why Choose IES for Flat Roofing
Flat Roofing Done Right, From Start to Finish
A flat roof has different challenges than a traditional pitched roof — drainage, seam integrity, and proper flashing around penetrations all matter even more when there’s no slope to help water run off. IES Construction & Roofing installs each of these systems to manufacturer specifications, with attention to the details that determine whether a flat roof lasts 10 years or 25.
Whether you’re replacing an aging flat roof, adding a new low-slope section to your home, or planning a rooftop deck, we’ll walk you through which system makes sense for your project — and why.