Single-Family Reroof with Solar and GAF WeatherWatch In San Jose, CA
The home on Kirkmont Drive in San Jose had reached the end of its roof’s lifespan, and the homeowner was ready to make a change — not just a new roof, but a full energy upgrade with solar added at the same time. That combination requires more than two separate contractors showing up on different days. It requires a team that understands how roofing and solar interact, how to waterproof a roof that will have racking hardware penetrating through it, and how to pull a single coordinated permit that covers the full scope of work.
Simmitri handled it all. Our team applied for Permit No. 2025-122978-RS through the City of San Jose, which was issued on August 5, 2025. We completed the full tear-off of the existing roofing system, inspected and prepped the decking, and applied GAF WeatherWatch self-adhering leak barrier underlayment across 7 squares of roofing — the zones where the solar racking hardware would penetrate the deck. The new roofing system was then installed, followed by the solar array, all as part of one coordinated scope led by project applicant Jonathan Garcia. On September 3, 2025, the City of San Jose conducted the Building Final inspection under Code 948 and signed off without a correction notice. Start to finish, the entire project was completed in under 30 days.
The Challenge
The homeowner on Kirkmont Drive wasn’t just dealing with an aging roof — they were also planning to add solar, which introduced a layer of complexity that a standard reroofing contractor isn’t always equipped to handle. Solar installation means racking hardware anchored directly into the roof deck, creating multiple penetration points that standard underlayment wasn’t designed to protect. Choosing a contractor who treated the roof and the solar system as two unrelated jobs would mean gaps in waterproofing, potential warranty conflicts, and the risk of moisture infiltration at every mounting point for years to come.
Our Solution
Simmitri approached this as one integrated project from day one. We pulled a single permit through the City of San Jose covering the full scope, specified GAF WeatherWatch underlayment across the 7 squares beneath the solar footprint to seal every racking penetration point, completed the reroof, and mounted the solar system — all under one coordinated team. The California Contractors State License Board requires licensed contractors to follow all applicable building codes, and Simmitri met every requirement. The City of San Jose’s Building Final inspection was passed on the first attempt on September 3, 2025. The homeowner got a new roof, a new solar system, and a clean permit record — without having to manage two contractors or worry about who was responsible for what.
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FAQ
Does Simmitri handle roofing and solar as one combined project?
Yes. Simmitri coordinates both trades under a single permit and project scope, eliminating scheduling conflicts, warranty gaps, and the confusion that comes with managing two separate contractors for the same home.
Why is GAF WeatherWatch used under solar panels?
Solar racking hardware creates multiple penetration points in the roof deck. GAF WeatherWatch is a self-adhering waterproof underlayment that seals tightly around each penetration, providing a level of protection that standard underlayment cannot match.
Does a combined reroof and solar project require a city permit in San Jose?
Yes. The City of San Jose requires permits for both roof replacements and solar installations. Simmitri handles the full permitting process on every project so homeowners never have to navigate city requirements on their own.
Will adding solar affect my new roof's warranty?
Not when installed correctly. Simmitri uses proper flashing, waterproofing, and compliant installation methods — including GAF WeatherWatch beneath the array — that preserve the integrity of the roofing system and align with manufacturer requirements.
How quickly can Simmitri complete a reroof and solar installation?
Timelines vary by project, but the Kirkmont Drive job was permitted, installed, and passed final inspection in under 30 days. Simmitri’s coordinated approach keeps projects on schedule from permit to sign-off. Request a free estimate to discuss your timeline.