Current roof condition
The existing membrane, substrate, moisture, prior repairs, and remaining serviceability.
Commercial Roof Systems
Select the field system around the complete roof assembly, building use, current condition, and project strategy—not a material name in isolation.
Commercial properties only Salem to Olympia via I-5 OR CCB #226463 · WA FLATRRL762CK
What determines the right roof system?
The material name is only one part of the decision. The existing roof, drainage, building use, and project goal narrow the options that make sense.
Drainage and roof shape
Slope, drains, scuppers, low areas, edges, walls, equipment, and penetrations.
Building use
Occupancy, interior conditions, exhaust, rooftop traffic, operations, and access needs.
Project goal
Repair, restore, overlay, replace, or install a new assembly—and how long the solution needs to serve the property.
Already know what kind of work the property needs?
Compare the systems we work with.
Start with the system family, then look at where it may fit and the conditions that must be checked before it is recommended.
Single-ply membranes
Three common membrane families for commercial low-slope roofs.
TPO roofing systems
Thermoplastic polyolefin (TPO) is a reinforced single-ply membrane system with field seams joined by hot-air welding.
WHEN IT MAY FIT
A candidate for new low-slope assemblies, qualified overlays, replacement work, and compatible repair scopes.
What should be checked?
- Deck and attachment
- Insulation and cover-board strategy
- Drainage and detail geometry
PVC roofing systems
Polyvinyl chloride (PVC) is a reinforced thermoplastic single-ply membrane with hot-air-welded field seams and project-specific accessories.
WHEN IT MAY FIT
A candidate where the roof design, building use, exhaust conditions, and material compatibility support the selected PVC assembly.
What should be checked?
- Exhaust and contaminant exposure
- Existing-material compatibility
- Traffic and rooftop operations
EPDM roofing systems
Ethylene propylene diene monomer (EPDM) is a synthetic-rubber single-ply membrane system.
WHEN IT MAY FIT
A candidate for commercial low-slope assemblies when the deck, attachment, drainage, details, and project requirements align.
What should be checked?
- Seam and flashing condition
- Attachment and perimeter design
- Compatibility of repair materials
Asphalt-based systems
Modified-sheet and multi-ply roof assemblies.
Modified bitumen
Modified bitumen uses polymer-modified bituminous sheets, often assembled in more than one layer depending on the specified system.
WHEN IT MAY FIT
A candidate for new work, reroofing, repairs, or restoration when the assembly, installation constraints, and substrate support it.
What should be checked?
- Existing plies and surfacing
- Application constraints
- Edges, drains, and flashings
Built-up roofing
Built-up roofing (BUR) forms a roof membrane from multiple reinforcing plies incorporated into a bituminous assembly.
WHEN IT MAY FIT
A candidate where a multi-ply asphaltic assembly fits the building, installation environment, and long-term roof plan.
What should be checked?
- Existing assembly and moisture
- Surfacing and transitions
- Installation logistics
Commercial metal
Panel systems evaluated around slope, profile, attachment, movement, and details.
Commercial metal roofing
Commercial metal can include standing-seam, through-fastened, structural, and nonstructural panel conditions rather than one universal roof system.
WHEN IT MAY FIT
A candidate for applicable commercial buildings, metal-roof repair, replacement, or restoration after the existing condition and panel system are identified.
What should be checked?
- Panel profile and slope
- Fasteners, seams, and movement
- Framing, substrate, and penetrations
Restoration + specialty systems
Paths for eligible existing roofs, walkable surfaces, and named manufacturer systems.
Silicone + GE LifeShield
A fluid-applied silicone system is a restoration path for an eligible existing commercial roof—not a universal substitute for a new membrane assembly.
WHEN IT MAY FIT
A preservation option when the existing roof can responsibly remain in place and the current system requirements can be met.
What should be checked?
- Restoration eligibility
- Moisture and adhesion
- Preparation and critical details
TUF-DEK systems
TUF-DEK is a walkable PVC-vinyl waterproofing system for suitable commercial roof decks, balconies, patios, and walkways.
WHEN IT MAY FIT
A specialty path for occupied walking surfaces—not a general field-roof alternative. Flat Roof LLC is TUF-DEK Certified.
What should be checked?
- Intended use and occupancy
- Substrate and movement
- Doors, edges, drainage, and railings
IB Roof Systems
IB Roof Systems is a manufacturer pathway rather than a separate generic material family.
WHEN IT MAY FIT
A named-system option within Flat Roof LLC’s confirmed commercial capabilities, subject to project scope and current manufacturer requirements.
What should be checked?
- Exact IB system proposed
- Approved assembly and details
- Current project requirements
Need help comparing these systems?Start with the building and current roof—not a material name.
Schedule a roof assessmentHow we narrow the options.
The recommendation should fit the roof and the property—not force the same material onto every building.
- 01Review the roof and building
Document the existing system, visible conditions, drainage, details, equipment, interior evidence, and property needs.
- 02Rule out poor-fit options
Use moisture, deck, slope, exposure, operations, and project requirements to narrow the practical system families.
- 03Define the recommended scope
Coordinate the selected field system with supporting layers, attachment, drainage, details, and sequencing.
Commercial roof system questions.
These are useful starting points. The roof assessment still determines which options fit the building.
Talk with Flat Roof LLC(971) 339-429901What is the best commercial roof system?
There is no responsible universal answer. The project path, existing assembly, moisture, deck, slope, drainage, building use, rooftop exposure, attachment, code, insurer or designer criteria, and current manufacturer requirements all affect suitability.
02How are TPO, PVC, and EPDM different?
TPO and PVC are thermoplastic single-ply systems with hot-air-welded membrane seams. EPDM is a thermoset synthetic-rubber membrane whose seams and details use manufacturer-specific tapes, adhesives, and accessories. Those material differences matter, but the supporting assembly and details still shape the project.
03Is modified bitumen the same as torch-down roofing?
No. Modified bitumen is a category of polymer-modified bituminous sheet roofing. Some products and assemblies use torch application, while others may use hot asphalt, cold adhesive, or self-adhered methods. The specified product and application method must be identified.
04Is silicone coating a replacement roof system?
Silicone is presented here as an existing-roof restoration path for an eligible assembly, not as a universal replacement membrane. Moisture, adhesion, compatibility, preparation, repairs, drainage, and critical details must be evaluated first.
05Where does TUF-DEK fit?
TUF-DEK belongs in the occupied, walkable waterproofing branch for suitable commercial roof decks, balconies, patios, and walkways. It should not be compared as though it were simply another general field-roof membrane.
06Can Flat Roof LLC work on the system already on our building?
Confirmed capabilities include TPO, PVC, EPDM, modified bitumen and torch-down, built-up roofing, silicone-restored roofs, applicable commercial metal, TUF-DEK, and IB Roof Systems. Exact repair, restoration, overlay, installation, or replacement scope still depends on the property and current roof condition.
Not sure which system fits your building?
Share the property, known roof system, visible concerns, timing, and access needs. Flat Roof LLC can help define the right assessment and next step.
Drainage + moisture context Building use + operations Complete-assembly thinking
Business-hours emergency leak help(971) 339-4299Schedule my roof assessment.Required fields are marked with an asterisk.