FlowGuard Slip Under Shingle 5 in & 6 in Gutter Cover System - 204 ft

In this review of the FlowGuard USA Made Slip Under Shingle gutter cover system, the bottom line is straightforward: this product is for homeowners and DIYers who want a durable, low-maintenance solution to keep gutters clear of leaves and heavy runoff. The FlowGuard's 018 heavy gauge painted aluminum construction and under-shingle mounting deliver a robust, permanent install that handles heavy rain, snow loads, and wind. The most compelling reason to buy is the combination of a sturdy American-made design and the 50 year no-questions-asked warranty that promises long-term reliability.

Key Features

• Made in the USA: Every component is manufactured in the United States, which supports consistent quality control and materials sourcing.
• Heavy gauge aluminum: The.018 painted aluminum resists rust and deterioration so the cover maintains strength and finish over time.
• Under-shingle design: The profile installs under roofing shingles and secures with included stainless steel fasteners to withstand extreme weather and wind.
• 3-point debris control: The raised pattern elevates wet leaves and allows airflow so debris dries and is removed by wind, helping prevent clogs.
• Easy installation: Dual interlocking ends, simple tin snip cutting, and included stainless steel 1/2 in #8 twin thread screws make it a realistic DIY project.
• Long warranty: A 50 year no-questions-asked warranty provides peace of mind and long-term protection.

Who It's For

FlowGuard is best for homeowners with standard 5 in and 6 in gutter systems who prefer a permanent, heavy-duty guard that mounts beneath shingles or on the roof edge. It suits homeowners who want to minimize annual gutter cleaning and who value a product built from durable materials and backed by a long warranty.

It is less suited to renters or those who need a temporary or removable solution, and homeowners who cannot lift shingles or who have uncommon roof edges should consult a roofing professional before attempting a DIY install.

Pros & Cons

Pros

• Durable.018 heavy gauge aluminum construction resists rust and holds up in severe weather.
• Under-shingle mount and included stainless steel fasteners produce a permanent, wind-resistant installation.
• 3-point design and elevated profile help keep gutters clear by allowing leaves to dry and blow off.
• Easy to cut and interlock, making the system accessible to competent DIY installers.

Cons

• Installation requires lifting shingles and using screws, so some homeowners may prefer a non-invasive guard.
• Color choices are limited to the offered finishes, which may not match every trim color.

Specifications

Our Verdict

FlowGuard is a solid choice for homeowners who want a long-lasting, low-maintenance gutter guard that really performs in heavy rain and wind. The strong aluminum build, under-shingle mounting, and 3-point design reduce clogs and simplify upkeep, making it good value for those prepared for a permanent, DIY install. The 50 year warranty seals the deal for durability-minded buyers.

Frequently Asked Questions

Will FlowGuard fit my 5 in or 6 in gutters?
Yes, FlowGuard is designed to work with standard 5 in and 6 in gutter systems.

Are screws included for installation?
Yes, stainless steel 1/2 in #8 twin thread pierce point zip screws are included for a permanent install.

Does the cover rust or need painting?
The.018 painted aluminum finish is made to resist rust and deterioration and typically does not require painting.