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Vikings Exterior installs and repairs all major flat and low-slope roofing systems for Seattle homes, ADUs, commercial buildings, and additions. Our flat roofing services: • TPO (Thermoplastic Polyolefin) — our recommended system for most Seattle applications • EPDM (Ethylene Propylene Diene Monomer) — cost-effective for smaller flat areas • Modified bitumen — excellent for re-roofing over existing flat systems • Built-up roofing (BUR) — traditional multi-ply system for heavy commercial • Fluid-applied coatings — for restoration of existing flat roofs We specialize in residential flat sections (extensions, garages, low-slope main roofs) and light commercial work.

These are the two most common flat roofing materials for Seattle residential projects: TPO (Thermoplastic Polyolefin): • White or light-colored reflective surface — energy efficient • Heat-welded seams — the strongest seam system available • Chemical resistance and UV resistance built in • Expected lifespan: 20–30 years • Best for: new construction, full replacements, energy-conscious homeowners • Cost: $9–$14/sq ft installed EPDM (Rubber Roofing): • Black synthetic rubber membrane — the industry standard for decades • Excellent flexibility in cold temperatures • Seams are adhesive or tape-bonded (not as strong as TPO heat-weld) • Expected lifespan: 15–25 years • Best for: budget-conscious repairs, smaller flat areas • Cost: $7–$12/sq ft installed For new flat roof installations in Seattle, we recommend TPO for its superior seams and energy performance.

Flat roofs are the #1 source of roofing insurance claims in Seattle — and almost always due to installation errors, not the material. Common flat roof failure points we see in Seattle: • Improper drainage design — flat roofs need positive slope (minimum 1/4" per foot) to drain • Poor seam installation — heat-welded TPO seams require specialized equipment and training • Failed flashings — where flat roof meets wall or parapet is the most common leak point • Ponding water — standing water accelerates membrane degradation • Insufficient insulation — thermal cycling stresses membranes over time When you hire Vikings Exterior for flat roofing, you get a system designed to drain correctly and installed with proper equipment — not a workaround that leaks in 5 years.

Not every flat roof problem requires full replacement. Common flat roof repairs we handle: • Seam resealing or rewelding (TPO) • Membrane patch repair for punctures or impact damage • Flashing replacement at walls, pipes, drains, and HVAC penetrations • Drain clearing and drain upgrade • Blister repair (air pockets in the membrane) If your flat roof is under 15 years old with isolated damage, repair is usually the right call. We'll give you an honest assessment during a free inspection.

2026 flat roofing cost estimates for Seattle metro: • EPDM installation: $7–$12/sq ft • TPO installation: $9–$14/sq ft • Modified bitumen: $8–$13/sq ft For a typical 1,000 sq ft garage or home extension: • EPDM: $7,000–$12,000 installed • TPO: $9,000–$14,000 installed Full flat roof tearoff and replacement for a 2,000 sq ft commercial-style low-slope roof: $18,000–$30,000. Call [PHONE] for a free inspection and firm quote.