Commercial roofing services in Seattle. TPO, PVC, and EPDM flat roofing. Expert installation and repair backed by a 10-year workmanship warranty.
Commercial roofing demands a different skill set than residential work. At K Single Corp, we’ve installed and maintained flat and low-slope roofing systems on warehouses, retail centers, office buildings, and multi-family properties throughout King, Snohomish, and Pierce County since 2007. Our team understands the unique challenges of commercial roofing, from coordinating with tenants and property managers to engineering proper drainage on large flat surfaces.
Whether you’re managing a strip mall in Kent, an office park in Redmond, or a warehouse in Tacoma, we bring the same level of precision and professionalism to every project. We’re licensed (WA #KSINGSC842B3), fully insured, and backed by manufacturer certifications from Carlisle, Firestone, and GAF.
TPO (thermoplastic polyolefin) has become the most widely installed commercial roofing membrane in the country, and for good reason. It offers an excellent balance of performance, energy efficiency, and cost-effectiveness. The white reflective surface reduces cooling costs and meets Washington State energy code requirements without additional coatings.
We install TPO in 60-mil and 80-mil thicknesses, with fully adhered or mechanically attached systems depending on your building’s structural requirements. Every seam is hot-air welded for a watertight bond that’s stronger than the membrane itself. We install polyiso insulation to meet or exceed current energy code requirements, and we pay close attention to flashing details around HVAC curbs, pipes, drains, and parapet walls, which is where most commercial roof failures start.
PVC (polyvinyl chloride) membrane is the superior choice for buildings exposed to chemicals, grease, or oils: restaurants, commercial kitchens, manufacturing facilities, and buildings with heavy rooftop equipment. PVC’s chemical resistance means it won’t break down from grease exhaust the way TPO and EPDM can.
PVC also has excellent fire resistance and meets FM Global ratings for insurance purposes. Like TPO, PVC seams are heat-welded and the white surface provides strong energy performance. The trade-off is a higher material cost, but for buildings that need chemical resistance, it’s the right investment.
EPDM (ethylene propylene diene monomer) is a synthetic rubber membrane that’s been used on commercial roofs for over 50 years. It’s one of the most time-tested systems available and performs exceptionally well in the Pacific Northwest climate. EPDM handles temperature swings, UV exposure, and constant moisture without breaking down.
We install EPDM in 60-mil fully adhered systems with taped or glued seams. While EPDM doesn’t offer the energy-reflective benefits of white TPO or PVC (it’s black), it’s an excellent choice for buildings where long-term durability and cost-effectiveness are the priority.
The Pacific Northwest gets 37+ inches of rain annually, and flat roofs need proper drainage to handle it. Ponding water (water that sits on a flat roof for more than 48 hours) is the number one cause of premature commercial roof failure. It degrades membranes, compresses insulation, and adds dangerous structural weight.
We engineer every commercial roof with positive drainage in mind. This includes properly sized interior drains, scuppers, or gutters, and tapered insulation systems that create slope where the structure is flat. We’ve retrofitted drainage on dozens of buildings across the Seattle metro where the original roof was installed without adequate slope.
We approach commercial projects with the planning and communication that property managers and building owners expect:
We install and repair commercial roofs throughout the Greater Seattle Area, including Seattle, Bellevue, Redmond, Kirkland, Renton, Kent, Tukwila, Tacoma, Everett, Lynnwood, and surrounding communities in King, Snohomish, and Pierce County. From a single retail bay to a 100,000+ sq ft warehouse, we have the crew and equipment to handle the job.
Call us at (206) 659-4349 for a free commercial roof assessment.
We install and repair all major commercial roofing systems. Our TPO installations use fully adhered membranes with heat-welded seams for superior waterproofing. Every project includes proper insulation to meet current energy codes.
We coordinate directly with building managers to schedule work that minimizes impact on tenants and operations. Most commercial roof replacements are completed within one week, and we clean up daily.
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Free estimates with no obligation. We respond within one business day.
Real work on real homes across the Puget Sound.
Tukwila
Phased TPO tear-off and replacement over three weekends, R-30 polyiso insulation, 80-mil TPO membrane, new curb flashings around 8 HVAC units, 20-year warranty.
Bellevue
Complete tear-off of failed EPDM membrane, insulation upgrade to R-30, 60-mil TPO membrane with fully adhered system, new scuppers and overflow drains, 10-year workmanship warranty.
Seattle
Complete EPDM tear-off, polyiso insulation to R-30, 60-mil TPO membrane with mechanical attachment, new roof drains, overflow scuppers, 15-year warranty.
From first call to final walkthrough. Here's how we work.
We inspect your roof, discuss your needs, and provide a detailed, no-obligation estimate, typically within 48 hours.
You receive a clear, itemized quote with material options, timeline, and warranty details. No hidden costs.
Our experienced crew handles your project with care: quality materials, clean worksite, and daily progress updates.
We walk the completed project with you, ensure everything meets our standards, and activate your 10-year workmanship warranty.
We offer payment plans to fit your budget. Ask about financing options during your free estimate.
Commercial roofing costs depend on the system, building size, and complexity. TPO and EPDM typically run $5-$9 per square foot installed, while PVC ranges from $7-$12 per square foot. A 10,000 sq ft flat roof might cost $50,000-$120,000 depending on the system chosen, insulation requirements, and rooftop penetrations. We provide detailed, itemized bids for every project.
TPO (thermoplastic polyolefin) is the most popular commercial membrane. It is cost-effective, energy-efficient, and heat-weldable for watertight seams. PVC is more chemically resistant, making it ideal for restaurants and buildings with grease exhaust. EPDM (rubber roofing) is a proven, durable option that's been used for decades. We'll recommend the right system based on your building's needs and budget.
Most commercial roof installations take 1-3 weeks depending on the building size and system complexity. A straightforward 10,000 sq ft TPO installation might take 5-7 working days, while a larger building with multiple penetrations, HVAC curbs, and drainage modifications could take 2-3 weeks. We schedule around your business operations to minimize disruption.
Yes. We offer annual and semi-annual maintenance programs for commercial roofs. Regular inspections catch small issues like ponding water, seam separations, and flashing failures before they become expensive repairs. Our maintenance program includes a full roof inspection, debris removal, drain clearing, and a written condition report with photos.
Every commercial roof we install includes our 10-year workmanship warranty covering all labor and installation. On top of that, manufacturers like Carlisle, Firestone, and GAF offer material warranties ranging from 15 to 30 years. On qualifying projects, we can secure NDL (No Dollar Limit) manufacturer warranties that cover both materials and labor.
Absolutely. We complete the majority of our commercial projects on occupied buildings. We coordinate closely with property managers and business owners to minimize noise, control access, and keep the building secure throughout the project. Weekend and after-hours work is available when needed.
Common signs include persistent ponding water, recurring leaks, visible membrane deterioration (cracking, blistering, shrinkage), wet insulation showing up on infrared scans, or a roof that's past its expected lifespan (typically 20-25 years for single-ply membranes). We provide free assessments with moisture surveys to help you make an informed decision.
Yes. Commercial roofing projects in King, Snohomish, and Pierce County typically require permits, and we handle the entire permitting process. This includes submitting plans, coordinating city inspections, and ensuring the completed roof meets all applicable building codes and energy requirements.
Yes. We provide emergency response for active leaks and storm damage on commercial buildings, typically within 24 hours. Our team can tarp the affected area to stop water intrusion and protect your building's interior and equipment while we schedule the permanent repair.
Get a free, detailed estimate for your commercial roofing project. We respond within one business day.