TPO · EPDM · Modified Bitumen — Installation · Replacement · Repair
Commercial Flat Roofing Throughout Illinois
Since 2006 we've installed, replaced, and repaired commercial flat roofs across Illinois — warehouses, manufacturing facilities, retail centers, and office buildings. Compare systems, understand cost, and get a free inspection with a written estimate.
A Quality Job at A Fair Price
Warehouses · Manufacturing Facilities · Industrial Buildings · Retail Centers · Offices · Large Commercial Properties
Most Popular Choice
TPO
Thermoplastic Polyolefin — the #1 flat roofing membrane on the market today. Heat-welded seams, bright white reflective surface, and built to last 20–30 years.
TPO is the most popular single-ply membrane on the market today. It's heat-welded into a single continuous sheet — meaning no seams to fail. Its bright white surface reflects sunlight and reduces cooling costs, making it an Energy Star® favorite.
- ✓ Best energy efficiency — reflects up to 80% of UV
- ✓ Heat-welded seams stronger than the membrane itself
- ✓ Lightweight — less structural load
- ✓ Resistant to chemicals, mold, and debris
- ✓ 20–30 year service life
Modified Bitumen
Color Choice Available
An asphalt-based membrane applied in layers — thick, durable, and the only flat system where you can choose your granule color to match your building's look.
- ✓ 2-ply system for redundant waterproofing
- ✓ Granulated surface — color options available
- ✓ Handles moderate foot traffic
- ✓ Works well in colder climates
- ✓ 15–25 year service life
EPDM
Ethylene Propylene Diene Monomer
EPDM is a rubber roofing membrane that's been the commercial industry standard for decades — known for exceptional long-term durability and performance in cold climates.
- ✓ Proven 20–30 year track record
- ✓ Handles extreme temperature swings
- ✓ Excellent for cold-weather climates
- ✓ Resistant to ozone and UV degradation
- ✓ Typically black (white-coated versions available)
Quick Comparison
Color choice
- TPO
- White/Gray only
- Mod-Bit
- ✓ Yes
- EPDM
- Black only
Energy efficiency
- TPO
- Best
- Mod-Bit
- Good
- EPDM
- Fair
Cold climate performance
- TPO
- Fair
- Mod-Bit
- Good
- EPDM
- Best
Durability / foot traffic
- TPO
- Good
- Mod-Bit
- Best
- EPDM
- Good
Typical lifespan
- TPO
- 20–30 yrs
- Mod-Bit
- 15–25 yrs
- EPDM
- 20–30 yrs
Relative cost
- TPO
- Mid
- Mod-Bit
- Mid
- EPDM
- Lower
| Feature | TPO | Mod-Bit | EPDM |
|---|---|---|---|
| Color choice | White/Gray only | ✓ Yes | Black only |
| Energy efficiency | Best | Good | Fair |
| Cold climate performance | Fair | Good | Best |
| Durability / foot traffic | Good | Best | Good |
| Typical lifespan | 20–30 yrs | 15–25 yrs | 20–30 yrs |
| Relative cost | Mid | Mid | Lower |
No Guesswork, No Fake Numbers
What Determines the Cost of a Commercial Flat Roof?
Anyone quoting a commercial flat roof without walking the building is guessing. These are the factors that actually drive the price:
Roof square footage
The single biggest driver — materials and labor scale with the total roof area.
Roof system selected
TPO, EPDM, and modified bitumen carry different material and installation costs.
Tear-off requirements
Whether the existing roof must come off — or can stay — changes the scope significantly.
Existing roof & deck condition
Saturated insulation or a deteriorated deck must be addressed before the new membrane goes down.
Insulation
Thickness and type of insulation affect both cost and long-term energy performance.
Penetrations & HVAC
Every unit, vent, and pipe needs flashing and detail work — busy roofs cost more than clean ones.
Drainage
Drains, scuppers, and slope corrections factor into the design and the price.
Building height & access
Taller buildings and tight sites take more logistics, equipment, and time.
Complexity & detail work
Parapets, curbs, transitions, and the amount of flashing all add labor.
Warranty & system specification
Membrane thickness, attachment method, manufacturer requirements, and warranty scope affect the complete roof assembly.
The only way to know what YOUR building will cost is to inspect it. We'll walk the roof, assess the existing system, insulation, deck, drainage, and details, then provide a written estimate.
Let Us Walk Your Roof For Free
We'll assess your building, explain the options, and give you a written estimate — no pressure.
SCHEDULE MY FREE INSPECTION