FlowGuard White Slip Under Shingle 5 in & 6 in Gutter Cover System

In this review the FlowGuard White Slip Under Shingle gutter cover is recommended for homeowners and DIYers who want a long-term, low-maintenance solution to clogged gutters. The bottom line: it is a sturdy, made-in-USA aluminum cover that installs under shingles and keeps leaves out while allowing heavy rain to flow freely, making it a strong choice for properties facing heavy rainfall, wind, or seasonal leaf fall. The reviewer found the installation straightforward for someone with basic tools and appreciated the 50-year warranty as a signal of confidence in durability.

Key Features

• Made in USA: Manufactured entirely in the United States, offering clear origin and quality control for buyers who prioritize domestic production.
• Heavy gauge aluminum: The.018 painted aluminum construction resists rust and deterioration, ensuring long-term performance in wet climates.
• Under shingle design: The slip under shingle profile installs permanently with included stainless steel fasteners to resist heavy rain, snow loads, and strong winds.
• 3-point airflow design: Elevates wet leaves and debris to prevent sticking so light winds and rain can clear the cover, reducing gutter maintenance.
• Easy installation: Dual interlocking ends and included 1/2 in #8 stainless steel twin thread pierce point zip screws make cutting and joining sections simple with tin snips and a drill.
• Full drainage even when covered: The 3-point design and damming effect slow overflow, allowing gutters to drain fully even with some debris present.

Who It's For

This gutter cover is best for homeowners with standard 5 in or 6 in gutters who are comfortable with a hands-on DIY install or who will hire a roofer. It suits houses that experience heavy rain, wind, or seasonal leaf drop and want a long-lasting guard that significantly reduces gutter cleaning.

It is less ideal for buyers seeking a non-permanent clamp-on system or those who need a snap-in design for very shallow roof edges; FlowGuard is specifically an under-shingle, permanently mounted solution and requires access beneath the shingle line during installation.

Pros & Cons

Pros

• Made in USA build and heavy gauge aluminum mean strong durability and corrosion resistance.
• Included stainless steel fasteners and interlocking sections simplify long runs and create a permanent installation.
• 3-point design prevents debris from sticking and encourages natural clearing by wind and rain.
• Works with all roof types and handles heavy rain while maintaining gutter flow.

Cons

• Requires under-shingle mounting, so installation can be more involved than clamp-on covers and may require roof access or professional help for some homeowners.
• White painted finish may show dirt over time and could require occasional exterior rinsing to keep appearance fresh.

Specifications

Product type	Slip under shingle gutter cover
Fits gutter widths	5 in and 6 in
Material	.018 heavy gauge painted aluminum
Length supplied	102 ft total
Fasteners included	Stainless steel 1/2 in #8 twin thread pierce point zip screws
Design feature	3-point airflow and damming pattern
Warranty	50 year manufacturer's warranty

Our Verdict

FlowGuard White Slip Under Shingle is a practical, long-lasting gutter cover for homeowners who want a near-permanent, low-maintenance solution that keeps gutters clear during heavy weather. With heavy gauge aluminum, included stainless fasteners, and a 50 year warranty, it delivers solid value for properties that can accommodate under-shingle installation and for buyers who prefer a made-in-USA product.

Frequently Asked Questions

Does this work with both 5 in and 6 in gutters?
Yes. The product is designed to fit both 5 in and 6 in gutter systems.

Are installation fasteners included?
Yes. Stainless steel 1/2 in #8 twin thread pierce point zip screws are included for permanent mounting.

Will it resist rust and weathering?
Yes. The.018 heavy gauge painted aluminum construction is built not to rust or deteriorate and is backed by a 50 year warranty.