Sheet Metal & Ventilation · Property Services

Custom Sheet Metal Flashing & Chimney Caps

Most roof leaks start where one surface meets another, and off-the-shelf flashing often does not fit unusual chimneys, walls or dormers. A sheet metal shop can fabricate pieces to the exact shape of your building. NorTech connects you with vetted sheet metal contractors who set their own price and build flashing and caps that last.

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Why custom flashing beats the stock kit

Standard flashing comes in a few shapes, and old or irregular buildings rarely match them. A custom piece is cut and bent to follow the exact outline of the chimney, wall or roof edge, with overlaps and drip edges that send water away from the joint. Seams may be locked, soldered or sealed. The contractor takes measurements and often makes a paper template, then builds the piece from metal that suits your budget and climate. Ask the pro to bring a sample of the seam style and metal thickness, so you can see what will actually go up on the roof.

Choosing copper, stainless, galvanized or aluminum

Galvanized steel is economical and paintable, aluminum is light and rust-proof, stainless steel resists corrosion and keeps its look, and copper ages to a handsome patina and lasts for generations. Some metals react with each other, so the contractor avoids pairing incompatible metals that cause corrosion. Fasteners and sealants should match the metal. Ask about thickness, finishes and warranties. Take photos of the leak stains inside and the flashing outside, and share them when you ask for a quote, so the pro knows exactly where water is getting in.

Installation, counterflashing and maintenance

Flashing works in layers, with base flashing tucked under roofing and counterflashing set into the masonry or wall above it. Joints are sealed, and the cap or crown cover sits above the flue with a drip edge to shed water. A water test confirms the work. Inspect annually, clear debris and reseal minor gaps. Quality custom work can outlast the roof around it. Ask for a sample of the metal and the seam detail before fabrication, and ask how the piece will be separated from dissimilar metals to prevent galvanic corrosion.

When to book custom sheet metal flashing & chimney caps

Your chimney leaks around the base or cap.

Off-the-shelf flashing does not fit your roof.

You have a historic or unusual building.

A crown is cracked and water gets in.

You are re-roofing and want flashing that lasts.

You want copper or stainless details for appearance.

90-Day Warranty

Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Frequently asked

Custom Sheet Metal Flashing & Chimney Caps — common questions

Measuring is quick, fabrication takes days to a couple of weeks, and installation is often a few hours. Copper and large pieces take longer. Photos and written notes make it easier to document and compare options.

It depends on budget and look. Copper and stainless last the longest, galvanized is economical, and aluminum is light. The contractor avoids combining metals that corrode together.

A cap with mesh keeps out birds, squirrels and debris, and a spark arrestor adds fire protection. Ask for the style you need. Your provider can walk you through the choices on site before any work starts.

Often yes, since flashing sits under roofing and old pieces may be corroded. New flashing during roofing is cost-effective. If conditions change once work begins, ask how the price and timing will be adjusted.

Copper can stain light surfaces below it over time, and the contractor can plan drip edges to limit it. Your provider can explain how this applies to your property before you book.

The contractor guarantees fabrication and installation workmanship for 90 days, including seams and sealing. Metals follow supplier terms, and patina changes on copper are natural.

Didn’t find your answer? Nova, our AI assistant, is in the chat bubble in the bottom-right corner and can help anytime.

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