[heading-style-h3]The Plywood Was Never There — And the Homeowner Had No Idea[heading-style-h3]

[heading-style-h4]Project Backstory[heading-style-h4]

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[heading-style-h6]Introduction[heading-style-h6]

When the homeowner of a property in Seattle’s Broadview neighborhood noticed bald patches on their shingles and exposed fiberglass threads, they suspected the roof was overdue for replacement. What they didn’t expect?

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Large sections of the roof had no plywood decking at all beneath the old shingles—leaving their home vulnerable to serious structural risks. With over 30% granule loss and a system well beyond its life expectancy, they turned to Flat Roof Pros for a complete roof replacement using Owens Corning Duration shingles—a high-performance, long-term solution backed by a Lifetime Limited Manufacturer warranty. In just a few days, we rebuilt the roof from the deck up—restoring strength, safety, and curb appeal.

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[heading-style-h6]About the Client[heading-style-h6]

The project involved a single-family residential home with a 1,700 sq. ft. asphalt shingle roof. Built over 15 years ago, the existing roofing system had become brittle and unsightly, with key areas around chimneys and valleys showing signs of water vulnerability. 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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The roof showed clear signs of aging and deterioration:

• Over 30% of the shingles had lost granules, exposing the fiberglass underlayment
• Multiple areas had become brittle, cracked, or loose
• Chimney flashing had worn down and risked moisture penetration
• The original system lacked ice and water barriers, leaving the home vulnerable during harsh weather
• Once the old roof was removed, we discovered that some areas were missing plywood decking entirely
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These factors combined to create a system that was no longer certifiable or code-compliant. A full tear-off and reinstallation was the only path forward.

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

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Flat Roof Pros performed a complete re-roof using the Owens Corning TruDefinition® Duration® shingles, which offer advanced durability and excellent weather resistance. The process included:

• Full removal of the existing aged roofing system down to the roof deck
• Inspection of the sheathing and replacement of any damaged or missing plywood using 19/32" CDX for structural reinforcement
• Installation of synthetic underlayment to provide a moisture barrier beneath the shingles
• Application of an ice and water shield in vulnerable areas to prevent leaks during harsh weather
• Replacement of both chimney flashings to ensure watertight protection around penetrations
• Installation of 24-gauge steel valley flashing and upgraded roof vents to improve drainage and airflow
• Installation of new ridge vent and pipe boots to maintain proper ventilation and seal all roof penetrations
• Final installation of the chosen architectural shingles, selected by the homeowner for both performance and curb appeal
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The project took about 2.5 days to complete—slightly extended due to missing plywood discovered during tear-off. Change orders were processed quickly, with homeowner approval at each step.

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

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• Lifetime Limited Manufacturer Warranty from Owens Corning
• 10-Year Workmanship Warranty from Flat Roof Pros
• Leak-Free Chimneys and Roof Penetrations
• Better Roof Ventilation and long-term weather performance
• Strong curb appeal and improved home value with a fresh new roof
• Code-compliant and structurally sound sheathing underlayment

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The new roof system not only addressed all functional concerns but gave the homeowner lasting peace of mind—knowing their home is protected from future storms, leaks, and structural deterioration.

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<<By managing every stage of the re-roof—from tear-off to structural reinforcement and installation of Owens Corning Duration shingles—we delivered a durable, code-compliant roofing system designed to protect the home for decades. This project is a reminder of why timely replacement matters—and how professional roofing inspections can prevent costly damage down the line.>>

Looking to Replace Your Aging Shingle Roof?

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Flat Roof Pros offers a variety of shingle replacement options that are built to withstand the Northwest’s rain, wind, and sun. If your roof is showing signs of wear, schedule a free consultation today and let us help you protect your home with a system built to last.
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📍 Proudly serving Seattle, Shoreline, Edmonds, and surrounding areas

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