[heading-style-h3]Plywood Missing: Seattle Roof Replacement From the Deck Up[heading-style-h3]

[heading-style-h4]Project Overview[heading-style-h4]

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[heading-style-h6]The Situation[heading-style-h6]

A homeowner in Seattle’s Broadview neighborhood contacted us after noticing bald patches on their roof, with exposed fiberglass, brittle shingles, and weathered valleys near the chimney. It was evident that the roofing system had reached the end of its life.

During the tear-off, a more serious issue was uncovered: large sections of the plywood roof deck were completely missing.

The old shingles had been installed directly over gaps in the structure—leaving the home vulnerable to moisture, mold, and long-term damage.

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[heading-style-h6]The Client[heading-style-h6]

This project involved a 1,700 sq. ft. single-family home with an aging asphalt shingle system over 15 years old. The homeowner’s goal was clear: a clean, updated system that would last for decades without constant maintenance.

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[heading-style-h4]Challenges[heading-style-h4]

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We uncovered several serious issues during inspection and tear-off:

• Over 30% granule loss, leaving shingles brittle and exposed
• Worn flashing around the chimney and valleys
• No ice or water barrier for cold-weather protection
• Gaps in structural decking, where plywood had never been installed

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These conditions meant the roof wasn’t just failing—it was no longer certifiable or code-compliant.

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[heading-style-h4]Solution[heading-style-h4]

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Flat Roof Pros designed a full tear-off and re-roof using Owens Corning Duration® shingles, known for their durability, wind resistance, and long-term value:

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‍Tear-Off and Deck Rebuild

• Removed all existing roofing down to the structural deck
• Rebuilt missing sections using 19/32” CDX plywood

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Moisture Protection

• Installed synthetic underlayment across all roof surfaces
• Applied ice & water shield in valleys and around roof penetrations

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Flashing and Chimney Work

• Reflashed both chimneys using 24-gauge steel for long-term durability
• Sealed all transitions and joints for maximum water resistance

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Ventilation and Penetrations

• Upgraded attic ventilation with new ridge vent and roof vents
• Installed new pipe boots and sealed all remaining penetrations

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Shingle Installation

• Installed homeowner-selected architectural shingles
• Ensured clean lines, even layout, and full system integration

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Project Coordination

• Provided on-site change orders for homeowner review
• Secured rapid approvals to maintain timeline and workflow

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The entire rebuild took 2.5 days, slightly extended due to the surprise decking repairs.

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[heading-style-h4]Completed Project[heading-style-h4]

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• Structurally Sound Decking: Gaps replaced with CDX plywood
• Improved Ventilation: New ridge vent and upgraded airflow
• Fully Waterproofed: Chimneys, valleys, and eaves sealed
• Lifetime Warranty: Manufacturer-backed system with 10-year workmanship coverage
• Modern Curb Appeal: A clean, fresh look with high-performance materials
• Code-Compliant: The roof is now fully up to standard

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