Empire Contractors installs, repairs, and maintains TPO roofing systems for commercial buildings in De Pere, WI. The company has been in business for 28+ years as a second-generation roofing company and uses an inspection-first approach, so the recommendation starts with the condition of the roof and building. This guide explains what a TPO system involves, what conditions affect suitability, and what owners should compare before installation.
TPO, short for thermoplastic polyolefin, is a single-ply membrane commonly used on flat and low-slope commercial roofs. TPO sheets are commonly joined with hot-air welded seams, and many products are available in light reflective colors. Suitability still depends on the roof assembly, attachment method, drainage, insulation, rooftop equipment, and building conditions. To discuss a De Pere property, call Empire Contractors at (231) 861-7221.
What Is a TPO Roofing System?
A TPO roof is part of a roof assembly that can include the structural deck, insulation, cover board, attachment components, membrane, flashing, and drainage details. The exact build-up varies by project. Seams, edges, penetrations, curbs, drains, and transitions are as important to watertight performance as the field membrane.
TPO is one of several single-ply options. EPDM and PVC are also used on commercial roofs, and each has its own strengths. Empire Contractors’ single-ply membrane page gives an overview of how these systems compare.
Parts of a TPO Roof
The table below summarizes the main parts of a TPO installation and why each one matters.
| Part of the system | What it involves | Why it matters |
|---|---|---|
| Membrane | A single-ply membrane, often available in light reflective colors, installed over the selected roof assembly | It forms the primary weathering surface, so product selection, attachment, detailing, and installation all affect performance. |
| Seams | Adjacent sheets are commonly joined with hot-air welding according to the selected system | Seam quality depends on compatible materials, surface condition, equipment settings, overlap, and installation quality. |
| Attachment | Mechanically attached, adhered, or another approved configuration depending on the deck, substrate, system, and design requirements | The attachment method affects how the system is secured, detailed, and staged and must fit the selected assembly and building conditions. |
| Flashings and details | Walls, curbs, parapets, drains and pipe penetrations are flashed and sealed | Details can become water-entry paths if they are damaged, poorly integrated, or not maintained, so they deserve careful review. |
| Insulation and drainage | Insulation is evaluated and the slope toward drains is reviewed | Moisture and recurring standing water can change the repair or replacement scope and should be evaluated separately. |
Why Building Owners Choose TPO
- Reflective options. Light-colored TPO products can reduce solar heat absorbed at the roof surface compared with darker surfaces, although whole-building energy results depend on the complete roof and HVAC system.
- Single-ply construction. TPO uses a single-ply membrane rather than a multi-ply field assembly, but the total installed roof weight depends on insulation, cover boards, attachment, ballast, and other system components.
- Heat-welded seams. TPO field seams are commonly joined with hot-air welding under the selected system’s installation requirements.
- Flexible membrane. TPO is designed as a flexible single-ply membrane, but movement, expansion, attachment, and detailing still need to be addressed in the roof design.
- Recover options. Some existing roofs may be candidates for a recover with TPO, depending on moisture, deck and insulation condition, existing layers, compatibility, code, attachment requirements, and the selected system.
Is TPO Right for Your De Pere Building?
TPO is commonly considered for flat and low-slope commercial roofs. Suitability depends less on the business type than on the existing assembly, deck and insulation condition, drainage, attachment design, rooftop equipment, penetrations, exposure, and project goals.
For De Pere buildings, winter conditions make drainage, snow and ice management, rooftop equipment, edges, and penetrations important design and maintenance considerations. The final roof design should follow project-specific drainage and structural requirements rather than a generic seasonal rule. Empire Contractors’ TPO roofing page for neighboring Green Bay describes the same installation approach: evaluating the structure and drainage, placing the membrane carefully and welding the seams.
What TPO Installation Involves
- Roof evaluation. The existing roof, insulation, deck, drainage, rooftop equipment, and project requirements are reviewed so the plan fits the actual building.
- Preparation. Existing materials are removed, repaired, or prepared as required, and moisture or substrate conditions that affect the scope are addressed.
- Membrane placement. TPO sheets are positioned and installed using the attachment method specified for the selected roof system.
- Seam welding. Overlapping sheets are hot-air welded according to the system requirements and inspected as part of installation quality control.
- Detailing and finish. Flashings and edges are completed around walls, curbs, drains and penetrations, and the finished work is reviewed.
TPO Repair and Maintenance
A TPO roof still needs condition-based inspection and maintenance. Reviews can focus on seams, punctures, flashing, drains, rooftop traffic areas, and prior repairs. The inspection schedule should reflect the roof’s condition, repair history, equipment activity, exposure, and any written manufacturer or warranty requirements. For ongoing care, see Empire Contractors’ commercial roof maintenance page.
If an inspection shows broader deterioration, moisture, repeated failures, or conditions that are no longer suitable for localized repair, comparing commercial roof replacement with continued repair can help define the next scope.
Talk With Empire Contractors About TPO in De Pere
Empire Contractors can look at your commercial roof, explain whether TPO fits and outline the installation, repair or maintenance options. Call (231) 861-7221 to discuss your De Pere building.
Frequently Asked Questions
What does TPO stand for?
TPO stands for thermoplastic polyolefin. It is a single-ply roofing membrane used mainly on flat and low-slope commercial roofs.
Are TPO seams really welded?
Yes. TPO field seams are commonly joined with hot-air welding. Seam quality depends on compatible materials, overlap, surface condition, equipment settings, membrane condition, and installation workmanship.
Can TPO be installed over an existing roof in De Pere?
Sometimes. A recover may be possible when moisture, deck and insulation condition, existing layers, compatibility, attachment requirements, code, and the selected TPO system support it.
What should a TPO proposal explain?
It should identify the roof assembly, attachment method, membrane and flashing details, drainage conditions, preparation or tear-off scope, moisture findings, and how concealed conditions will be handled.