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

In this review the FlowGuard USA Made Slip Under Shingle gutter cover is judged as a practical, long-term solution for homeowners who want to stop cleaning clogged gutters. The single biggest reason to buy is its durable under-shingle design made from heavy gauge painted aluminum that resists rust and permanently mounts with stainless steel fasteners, so it stands up to heavy rain, snow loads and wind without frequent maintenance.

Key Features

• Made in the USA: Manufactured entirely in the USA, providing consistent quality control and materials sourced for long life.
• Heavy gauge aluminum: The.018 painted aluminum construction will not rust or deteriorate, which helps protect gutters for decades.
• Under-shingle installation: The slip under shingle design and included stainless steel twin-thread zip screws create a permanent attachment that resists extreme weather.
• 3-point flow design: Elevates wet leaves so airflow prevents debris from packing and allows heavy rain to pass into the gutter.
• Easy to cut and join: Dual interlocking ends and a 45 degree drain hole pattern make continuous runs and mitered corners straightforward with basic metal snips.
• 50 year warranty: Backed by a no-questions-asked 50 year manufacturer warranty, offering long-term peace of mind.

Who It's For

The FlowGuard system is aimed at homeowners with standard 5 in and 6 in gutters who want a low maintenance solution and prefer a durable aluminum product that permanently mounts under shingles. It fits well for properties that see heavy seasonal rain, occasional snow loads, and winds where a secure attachment is important.

It is less suitable for roofs or eaves where the roofing configuration does not allow slipping a cover under the shingle or where very nonstandard gutter widths are used; some customers reported mixed fit on unusual widths, so measure gutters and roof overhangs before ordering.

Pros & Cons

Pros

• Made of heavy gauge painted aluminum that resists rust and offers long service life.
• Included stainless steel 1/2 in #8 twin thread pierce point zip screws make installation straightforward.
• 3-point design prevents debris buildup and channels heavy rain into gutters effectively.
• Dual interlocking ends simplify continuous runs and cutting for corners.

Cons

• Width compatibility can be mixed on nonstandard gutters, so fit must be confirmed before purchase.
• Requires working at roof edge and some basic metal cutting tools for installation.

Specifications

Our Verdict

The FlowGuard Slip Under Shingle gutter cover is a solid value for homeowners with conventional 5 in or 6 in gutters who want a durable, low-maintenance solution that stands up to heavy rain and wind. Its heavy gauge aluminum, included stainless fasteners and 50 year warranty make it a dependable long-term fix, though buyers should confirm fit if gutters or roof edges are nonstandard.

Frequently Asked Questions

Will this work on my 5 in gutters?
Yes, it is designed to fit both 5 in and 6 in gutter systems; verify gutter profile and roof overhang compatibility first.

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

Does it stop all leaf buildup?
The 3-point design greatly reduces and in most cases eliminates gutter cleaning by elevating debris so wind and rain clear dried leaves, though heavy wet debris can require occasional attention.