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WNC Roofing
WNC Roofing

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A composite image showing a worker removing an old skylight, a roof section with old skylights capped with new metal, and another worker installing a wooden frame for a new curb-mounted skylight on a white polyiso cover board.
A worker in safety gear is shown on a metal roof, lifting an old fiberglass skylight cover to reveal the opening below, as part of the capping process.
A metal roof features two rectangular sections where old skylights have been capped with new, lighter-colored metal panels, blending into the existing roof structure.
A worker in a safety harness kneels on a white polyiso cover board, installing a wooden frame for a new curb-mounted skylight on a metal roof.
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Flute Fill Roof Replacement and New Skylights

The first thing you want to do after setting up your perimeter safety on a new Flute Fill System is capping the old skylights. More safety.

This building owner chose to cap 50% of the old fiberglass lights and install new curb mounted skylights on the other 50.

Also...a 1.5" polyiso cover board is a fantastic choice with this system for multiple reasons.

We can see one in the framing photo.

https://wncroofing.com

2025/12/3 Edited to

... Read moreWhen undertaking a flute fill roof replacement, safety and energy efficiency are paramount. Setting up perimeter safety is the initial critical step to protect workers throughout the project. Next, capping old fiberglass skylights helps eliminate potential leaks and challenges related to aging materials. However, retaining some skylights as new curb-mounted installations allows natural lighting to brighten interior spaces, balancing functionality and aesthetics. Additionally, integrating a 1.5-inch polyiso cover board offers multiple advantages. Polyiso insulation boards are known for their high R-value per inch, significantly improving thermal resistance and energy efficiency of the roofing system. This insulation layer also reinforces roof durability and provides a stable base for the membrane. Its moisture-resistant properties prevent degradation, extending roof lifespan. Using polyiso with a flute fill system effectively fills the metal deck's flutes, creating a flat, uniform surface for membrane application. This minimizes membrane stress points and potential damage over time. Moreover, optimizing the skylights' balance—capping about half while installing new curb-mounted units—ensures the building receives ample daylight without compromising the roof’s weatherproofing integrity. Altogether, these elements contribute to a safe, durable, and energy-efficient roofing solution. Consulting with professional roofing contractors experienced in flute fill and skylight systems ensures proper installation, code compliance, and maximized performance. For owners considering similar upgrades, evaluating both insulation options and daylighting impact can result in better occupant comfort and lower utility costs.