Gig Harbor, WA
Haven of Rest
Metal Retrofit · TPO Upgrade
Roof retrofit upgrading aging standing-seam metal to a TPO system, no full tear-off needed.
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Greater Seattle Commercial Flat Roofing Company
Reliable Commercial Flat Roofing Company in Seattle
We are a commercial flat roofing company in Seattle known for well-managed projects, consistent communication, and roofing systems designed to support long-term building performance.
5.0 Google · 40 reviews
30-Year Warranty
Tenant-First Install
SUMMER SPECIAL
Up to $5,000 Towards a Roof Replacement
*Terms apply. Offer expires 12/31/26
Request a Free Estimate
Same-day callback Mon–Fri. We’ll inspect, scope, and quote in writing.
Greater Seattle Commercial Flat Roofing Company
Flat roofing systems designed for long-term performance
We are a commercial flat roofing company in Seattle known for well-managed projects and consistent communication.
A reliable partner for organized, well-managed roofing projects
Why Choose Our Commercial Flat Roofing Contractors
Choosing a commercial flat roofing company in Seattle should simplify your role, not add to it. We keep projects organized, document progress, and maintain safe, clean job sites throughout the installation process.
Here’s what you can expect from our commercial flat roofing contractors.
Leak-Free Performance Pledge
Documented QA to promote consistent installation quality and dependable leak protection.
Portfolio Care for PMs & Owners
Free roof audits, 3-year capital planning, and priority scheduling across your properties.
Clean Site Guarantee
Walkways kept clear, common areas protected, and daily cleanup completed to maintain a tidy, professional jobsite.
On-Time, On-Budget Scorecard
Transparent milestones, change orders, and progress photos. We start when promised and finish as bid.
Certified Crews, Modern Systems
Authorized installation of premium commercial roofing systems backed by ongoing training.
Warranty & Protection
20–30 year manufacturer warranties for qualifying new roof installs. See our Warranty & Protection page for more details.
Complete flat roof care from inspection to installation
Our Commercial Flat Roofing Services
As a commercial flat roofing company in Seattle, we support flat and low-slope roofs across office buildings, retail centers, industrial facilities, and multi-family properties. From initial inspection through final closeout, you work with one organized team that keeps your project clear, documented, and on track.
Commercial Flat Roof Replacement — Complete replacement for aging or failing systems. We evaluate tear-off and recover options where appropriate, then install code-aligned insulation and drainage improvements to support long-term performance.
Commercial Flat Roof Repair — Targeted repair for leaks, flashing failures, punctures, seam separation, and storm damage, focused on resolving the issue efficiently while helping reduce repeat problems.
Flat Roof Installation & Construction — Installation for new construction, tenant improvements, and building expansions, with clear coordination across trades to keep schedules aligned.
Flat Roof Waterproofing & Coatings — Proactive systems that provide an alternative to full roof replacement while extending roof life and enhancing performance.
Final Cleanup and Jobsite Reset
Ongoing daily cleanup throughout the project and a final walkthrough to ensure the jobsite is clean, safe, and ready for normal operations.
Drainage and Gutter Improvements
Ensuring water moves off the roof properly to prevent ponding and future issues.
Flashing and Edge Metal Upgrades
Replacement or integration of flashing, edge metal, and penetration details to strengthen perimeter protection and support long-term leak prevention on commercial roof replacements.
New Roofing System Installation
Installation of the new commercial roofing system using certified methods and manufacturer-approved details, completed by an experienced commercial roof replacement contractor.
Substrate and Deck Evaluation & Repair
During commercial flat roof replacement, decking, insulation, and structural elements are evaluated and repaired as necessary to support the new roofing system, whether installed as a tear-off or overlay.
Roof Preparation and Selective Removal
When we replace a commercial roof, our approach depends on existing conditions and system design. Projects may involve a full tear-off or selective removal to properly prepare the roof, with clean, controlled debris handling to protect the building and surrounding areas.
Materials and systems designed for long-term commercial performance
Commercial Roofing Systems We Install
As a commercial flat roofing company in Seattle, we install proven systems for flat, low-slope, and select steep-slope or walkable roof areas when your building requires them. Each system is selected based on performance goals, building use, and long-term maintenance planning.
Here are the commercial roofing systems we work with:
Commercial PVC Roofing
Durable single-ply membrane with excellent chemical resistance and long-term waterproofing.
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Commercial Roof Coating
Fluid-applied systems that restore aging roofs and extend service life.
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13+ years of proven commercial roofing experience
Meet Your Seattle Roofing Team
Meet the team responsible for delivering dependable workmanship and consistent project performance.
Ivan Prokopets
Owner & CEO
Rita Prokopets
Chief Operating Officer
Washington Weather Shield Team
What the process looks like
Our Commercial Flat Roofing Process
Our commercial flat roofing company in Seattle follows a predictable process that keeps decisions simple and progress visible. This applies whether you need a commercial flat roof repair or a complete commercial flat roof replacement. Here’s a simple three-step process to get started.
Step 1: Schedule Your Free Roof System Evaluation
We visit the property, evaluate the existing conditions or project plans, and document current conditions with photos.
Step 2: Approve Your Scope and Project Plan
You receive a clear estimate, recommended scope of work, and timeline so expectations are established before the work begins.
Step 3: Installation, QA, and Project Closeout
Our crew completes the work, manages cleanup, and keeps you updated throughout the project. At closeout, you receive the documentation needed for warranty support and future roof planning.
Cost-effective performance built for long-term reliability
Why Commercial Flat Roofing is a Smart Investment
Commercial flat roofing offers practical advantages for many building types — offices, retail centers, industrial facilities, and multi-family properties: lower installation costs than many steep-slope systems, easier access for inspections and equipment service, simpler repairs over time, efficient drainage and insulation options, and better long-term capital planning.
When installed correctly, flat roofing systems are easier to inspect, maintain, and manage throughout the life of the building. Working with an experienced commercial flat roofing company helps control lifecycle costs, reduce unexpected repairs, and keep your property operating without disruption.
Reviews
Client Testimonials
Property managers, owners, and contractors rely on clear communication and consistent performance. Here’s what Seattle businesses have to say about working with our commercial roofers.
5.0 ★★★★★
Google · 40 reviews
01/ 15
I hired Ivan for a TPO roofing project, and I couldn’t be happier with the results. He stepped in on very short notice right before the rain was coming, which helped us avoid major issues. His work was professional, clean, and done exactly the way it needed to be.
Roman Gural
Washington Weather Shield replaced a metal and PVC roof on one of our custom Mercer Island homes and did an excellent job. Great communication, skilled crew, and top-quality work from start to finish. Highly recommend!
Remont Construction
Excellent roofing company! Washington Weather Shield just did an apartment building for us. Definitely our go to roofer going forward. Delivered a superior product in a timely manner and on budget as promised. Super professional every step of the way and great communication. Thank you Washington Weather Shield! Highly recommended! A++++
Mark Caldwell
Customers love what we do
What Clients Say About Our Roofing Work
When people search for a local commercial roof replacement company, they want steady communication and reliable results. See what Seattle businesses say about working with our commercial roofers.
FAQs on Commercial Flat Roofing
General FAQs
What is flat roofing?
Flat roofing is a low-slope or nearly level roof system commonly used on commercial buildings. While these roofs appear flat, they are designed with a slight pitch to allow for proper drainage. Commercial flat roofing systems typically use durable waterproof membranes such as TPO, PVC, or EPDM. These materials are engineered to handle ponding water, temperature fluctuations, and long-term exposure to weather while maintaining consistent performance.
What is a commercial flat roof called?
A commercial flat roof is commonly referred to as a low-slope roof, since it is designed with a slight pitch for drainage even though it appears flat.
The specific name often depends on the roofing material or system used, such as TPO roofing, PVC roofing, EPDM roofing, or modified bitumen roofing. Some commercial flat roofing contractors may also describe the system by its installation method, such as fully adhered, mechanically attached, or ballasted systems.
How is commercial flat roofing installed?
Flat roofing installation begins with inspection and preparation of the roof deck to ensure a solid, dry substrate. Insulation is installed as needed to improve energy performance and create proper drainage slope. A waterproof membrane such as TPO, PVC, or EPDM is then installed using heat-welded seams, adhesives, or mechanical fasteners depending on the system design.
Final steps include detailing penetrations and flashing, reinforcing seams, and completing a documented quality inspection to confirm the roof is fully sealed and ready for long-term performance.
What materials can be used for flat roofing?
Common commercial flat roofing materials include:
- TPO (thermoplastic polyolefin)
- PVC (polyvinyl chloride)
- EPDM (rubber membrane)
- Modified bitumen
- Built-up roofing (BUR)
- Roof coatings (silicone, acrylic, polyurethane)
- Spray polyurethane foam (SPF) in some applications
When you are choosing between commercial flat roofing companies, focus on what they install most often and how they detail seams, drains, edges, and penetrations.
What are the main types of flat roofs?
A simple way to group the main types of commercial flat roofing is:
- Single-ply membranes: TPO, PVC, EPDM
- Modified bitumen: asphalt-based sheets for durability and redundancy
- Built-up roofing (BUR): layered asphalt and reinforcing felts
- Roof coatings: silicone, acrylic, or polyurethane fluid-applied systems used to restore aging roofs and extend service life when the underlying assembly is still in suitable condition
At Washington Weather Shield, we walk you through each option and explain which system fits your building, budget, and long-term goals.
What is the best roofing material for a flat roof?
The best material depends on your building’s use, budget, and climate. TPO is known for energy efficiency and cost-effectiveness. PVC offers excellent durability and strong resistance to chemicals and grease. EPDM provides proven long-term performance with a lower upfront cost. Our team helps you evaluate each option and select the system that best fits your building’s needs and long-term goals.
What is the life expectancy of a commercial flat roof?
Most commercial flat roofs last 15 to 30+ years, depending on the system, installation quality, drainage, and maintenance. Clean drainage and fast commercial flat roof repair can add years to a roof’s service life. When repairs stop being cost-effective or issues repeat across large areas, commercial flat roof replacement is often the smarter long-term move. A commercial flat roofing company in Seattle should help you compare those paths clearly.
How to install metal roofing on a flat roof?
Metal is rarely installed on truly flat roofs. It works on low-slope roofs when the design meets minimum slope and detailing requirements. A typical approach is:
- Confirm slope and add tapered insulation or crickets if drainage is weak
- Install the right underlayment and substrate
- Install standing seam or engineered low-slope metal panels per manufacturer specs
- Detail every transition, curb, and penetration with the correct flashing system
- Verify drainage paths and water test critical areas
If you are comparing flat roofing companies, ask how they handle slope, drainage, and penetration details before proposing metal.
Pricing & Contracts
What affects the price of commercial flat roofing?
Commercial flat roofing cost depends on several factors, including your roof size, existing roof condition, system design requirements, and the level of work needed to achieve a durable, watertight installation. Pricing is also based on whether the scope calls for a commercial flat roof repair or a full commercial flat roof replacement.
Common factors that affect cost include:
- Roof size (total square footage) and building configuration
- Scope: commercial flat roof repair vs commercial flat roof replacement
- Manufacturer of the flat roof system
- Roof system type (TPO, PVC, EPDM, coatings, and some low-slope metal assemblies)
- Insulation needs, including wet insulation removal, code upgrades, or tapered insulation for drainage
- Drainage improvements such as crickets, additional drains, scuppers, or ponding corrections
- Roof complexity, including curbs, skylights, parapets, penetrations, and rooftop equipment
- Site access and staging requirements such as lifts, cranes, and material loading zones
- Occupancy considerations including tenant coordination, work hour limitations, and protection of operations
- Warranty level and manufacturer system requirements for qualifying coverage
- Deck repairs if deterioration is discovered during tear-off or preparation
For the most accurate pricing, Washington Weather Shield recommends scheduling a roof inspection so you can compare repair, restoration, and replacement options.
Do you offer written estimates and detailed scopes of work?
Yes. Washington Weather Shield provides written estimates and detailed scopes of work for commercial flat roofing projects. Your proposal outlines system recommendations, scope, and warranty coverage so you can compare bids clearly and make a confident decision.
How do contracts and payment schedules work for commercial roofing projects?
At Washington Weather Shield, contracts are signed before work begins. Our standard payment schedule is 50% upfront to order materials and secure installation dates, with the remaining 50% due upon completion. For larger commercial flat roof replacement projects, progress payments may be requested based on size and timeline.
Expertise & Credentials
Are your commercial roofing contractors licensed and certified?
Yes. Washington Weather Shield is fully licensed, and our commercial roofing team is trained and certified to install flat and low-slope systems using manufacturer-approved methods for long-term performance and warranty compliance. We are certified with top commercial roofing manufacturers, including GAF (TPO & PVC), Versico (TPO & PVC), Duro-Last (PVC), and GE Enduris—and we’re especially proud to hold GAF GoldElite™ Commercial Contractor status, a highly selective certification level.
What training do your roofing crews receive each year?
At Washington Weather Shield, our commercial roofing crews complete ongoing hands-on training to stay current on the latest installation methods, safety standards, and manufacturer requirements. This includes training and education through top roofing manufacturers such as GAF (TPO & PVC), Versico (TPO & PVC), Duro-Last (PVC), and GE Enduris, helping ensure every roof we install meets professional standards and warranty guidelines.
Do you work with manufacturer-backed roofing systems?
Yes. Washington Weather Shield installs manufacturer-backed commercial roofing systems. All of our roofing systems are built using trusted, manufacturer-approved materials and installation methods to support long-term performance and warranty eligibility.
How do I know I’m hiring a qualified commercial roofer?
A qualified commercial roofer should have proven experience with commercial flat and low-slope roofing, proper licensing and insurance, strong safety practices, and the ability to provide detailed scopes, references, and warranty options. At Washington Weather Shield, we meet these standards through our commercial roofing expertise, manufacturer certifications, and our commitment to professional installation methods and long-term roof performance.
Serving the Greater Seattle Area and beyond
Our Service Areas
Providing commercial roofing services in Seattle and surrounding communities — 47 cities across nine counties.
Tap a city to see it on the map.
Cities
- Seattle
- Tukwila
- Bellevue
- Renton
- Kent
- Auburn
- Federal Way
- Redmond
- Kirkland
- Bothell
- Everett
- Lynnwood
- Edmonds
- Mountlake Terrace
- Shoreline
- Burien
- SeaTac
- Des Moines
- Issaquah
- Sammamish
- Mercer Island
- Newcastle
- Maple Valley
- Covington
- Black Diamond
- Snoqualmie
- North Bend
- Carnation
- Duvall
- Woodinville
- Mill Creek
- Lake Forest Park
- Kenmore
- Fife
- Milton
- Puyallup
- Sumner
- Bonney Lake
- Lakewood
- University Place
- Steilacoom
- Gig Harbor
- Bremerton
- Port Orchard
- Silverdale
- Olympia
- Lacey
Counties We Serve
Service area
Greater Seattle
47 cities · 9 counties
Serving the Greater Seattle Area and beyond
Our Service Areas
Providing commercial roofing services in the Puget Sound and Greater Seattle areas.
- Bellevue
- Seattle
- Tacoma
- Kent
- Renton
- Federal Way
- Auburn
- Redmond
- Olympia
- Kirkland
- Tukwila
- Puyallup
- Lakewood
- Burien
- SeaTac
- Everett
- Chehalis
- Bellingham
- Marysville
- Lacey
- Des Moines
- Kenmore
- Black Diamond
- Sumner
- Sammamish
- Shoreline
- Bothell
- Bremerton
- Edmonds
- Lynnwood
- Issaquah
- Parkland
- University Place
- Spanaway
- Maple Valley
- Mercer Island
- Covington
- Mukilteo
- Centralia
- Enumclaw
- Snoqualmie
- Gig Harbor
- Fife
- Shelton
- Milton
- Pacific
- Bonney Lake
Working Project
Finished Project
A closer look at our work across Greater Seattle
Recent Commercial & Industrial Roofing Projects
We’ve completed commercial and industrial roofing projects across the Puget Sound from warehouses and manufacturing facilities to retail and distribution centers. Here’s a look at some recent work we’ve completed.
Puyallup, WA
Legend Auto Sales
Tear-Off · Asbestos Abatement
Full roof tear-off with asbestos abatement and complete replacement for an auto dealership.
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Tacoma, WA
Demgy Pacific
TPO Roof Overlay
TPO overlay for a precision manufacturer of high-performance plastics and composite components.
View project →Start with a quick site visit and a clear plan
Work With a Commercial Flat Roofing Company You Can Rely On
Looking for a commercial flat roofing company that runs organized projects and communicates clearly? Schedule a visit and get a detailed assessment of your roof, timeline, and options.
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