Flashing Aluminum Sheet Metal 5 x 7 in 120 Pc - Roof Weatherproofing

In this review the Therwen 120 piece flashing set is judged as a practical, no-frills solution for homeowners and handymen who need a lot of small metal flashing for routine repairs or new installs. The main reason to buy is simple: it supplies a large quantity of easily trimmed aluminum panels so you can quickly add an extra layer of weather protection around chimneys, skylights or other roof penetrations without sourcing individual pieces. It is a straightforward, value-focused product best suited to budget repairs and repetitive tasks.

Key Features

• Pack Quantity: 120 pieces provide enough flashing for multiple small jobs or a full repair session without repeated trips to the store.
• Trim to Fit: Each 5 x 7 in panel can be cut with tin snips so you can shape flashing to fit odd corners, seams or gaps.
• Material: Made from aluminum, the sheets are lightweight and corrosion resistant for typical roof use, offering dependable water shedding when installed correctly.
• Easy Attachment: Panels can be secured with nails, screws, or adhesive tape, giving flexibility depending on substrate or weather conditions.
• Multi Use: Besides roof work, the thin metal pieces can be applied as repellents against bird or rodent entry points or as a backing behind siding joints.

Who It's For

This set is aimed at homeowners doing their own maintenance, contractors who need bulk small flashings for repetitive detailing, and DIYers who prefer to shape and place metal on site. The large pack and ability to trim mean it suits projects where many small pieces are needed rather than custom-fabricated flashings.

Those who need finished, painted, or long-term decorative flashings should look elsewhere because these are plain aluminum panels that may darken over extended exposure to rain and will eventually need replacement; they are best suited to functional weatherproofing rather than aesthetic finish work.

Pros & Cons

Pros

• High value: 120 pieces cover many repairs or several installations without extra purchases.
• Versatile: can be cut and attached in multiple ways to fit different roof details.
• Functional: provides an effective extra layer of weatherproofing around chimneys and skylights when installed properly.

Cons

• Surface can darken after long rain exposure, so replacement will be required over time.
• Not decorative or pre-formed for complex roof profiles, so extra trimming and fitting are often needed.

Specifications

Brand	Therwen
Quantity	120 pieces
Individual Size	Approximately 5 x 7 in (12.7 x 17.7 cm)
Material	Aluminum
Primary Uses	Chimneys, skylights, roof weatherproofing, bird and rodent deterrent

Our Verdict

For anyone who needs a large number of small roof flashings at a low cost, this 120 piece aluminum set is a practical buy that balances value and utility. It is best for straightforward weatherproofing tasks where panels will be trimmed and attached on site; expect to replace pieces after extended wet exposure but appreciate the bulk supply for routine maintenance or contractor use.

Frequently Asked Questions

Can these sheets be cut to size?
Yes. They can be trimmed with tin snips so you can create custom shapes for tight corners and seams.

How do I attach the flashing?
They can be attached with nails, screws, or adhesive tape depending on the surface and permanence required.

Will the aluminum corrode or discolor?
The panels are aluminum and do not have an odor, but the surface may turn dark after prolonged rain exposure; this does not affect short-term function but indicates eventual replacement is needed.