Best Chimney Flashing for a Metal Roof (2026): 5 Picks Compared

Compare the picks

Specifications are manufacturer rated, collected 21 October 2026.

How the Woodlot Score works

Each flashing is scored on performance (pipe range, temperature range and kit contents), build (materials and base design), value (what the box includes for the stated specs), safety (stated certifications) and warranty (stated term). Only the listings facts are used.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.

Buying guide: choosing the best chimney flashing for a metal roof

Pipe size first

Measure the outside diameter of the pipe, then match it to the boot’s stated range. The #7 boots here state 6 to 11 in of pipe OD, the #8 VIVIDA states 7 to 13 in, and the Selkirk is made for a 6 in chimney with an 8.1 in opening for double wall pipe. The Sobalai listing disagrees with itself: the title says pipe OD 6 to 9 in while the bullets and spec table say 6 to 11 in, so confirm the size with the maker before buying. Sheet flashing skips the question entirely: the Therwen sheets are 5 x 7 in and trim to size.

Boot, adjustable flashing or sheet

A pipe boot is a one-piece silicone cone on a square base that hugs the pipe and molds to the roof; it is the common answer for a round chimney pipe through a metal roof. An adjustable flashing like the Selkirk is a metal plate shaped for the chimney penetration that diverts rain and snow down the roof, with a series of sizes for different roof pitches. Sheet flashing is the loose material option: 20 aluminum sheets for patching and layering around chimneys and skylights, cut with tin snips and fixed with nails, screws or adhesive tape. For a round flue, start with a boot; for a masonry chimney, see the best flashing for brick chimney.

Temperature ranges

Only the silicone boots state temperature figures. The Sobalai and Aothotop state +500 F maximum and -100 F minimum; the VIVIDA states -165.2 to 446 F. The Selkirk and Therwen state no temperature figures. Compare the range with the flue’s operating temperature, and never run a boot past the maker’s stated range: the VIVIDA listing warns the product will not perform properly past its range. Chimney and roof work is pro work; have a certified chimney sweep or roofer handle the install and follow local code. The stove pipe vs chimney pipe guide explains which pipe the flashing has to seal around.

Base and roof profile

The base has to sit flat on the roof profile. The VIVIDA and Sobalai use flexible square bases that mold to the rib lines of corrugated metal roofing; the Sobalai base is aluminum with marked cut lines, and its square base measures 14.17 by 14.17 in. Two selection notes come straight from the listings: VIVIDA says that with deep corrugated panels over 1.5 in, choose the next size boot up, and that a square base is the pick when the roof pitch is greater than 10/12. The Aothotop states fit for 10/12 to 12/12 slopes. The Therwen sheets, at 5 x 7 in, are the fallback for odd shapes the boots do not cover.

Kit contents and warranty

Count what comes in the box before comparing. The Sobalai ships the boot with 2 hex sockets and 50 roofing screws, the VIVIDA with 30 roofing screws and an 8mm hex socket, and the Aothotop with roofing screws and a hex socket; the Selkirk and Therwen list no fasteners. Only the Sobalai states a warranty term, 2 years. The Selkirk spec table carries the word Warranty with no term, which counts as no stated warranty here. A full fastener kit matters on a metal roof, where every base screw is a potential leak point if it is missing or wrong.

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Movement and sealing

A chimney pipe moves: it expands with heat, contracts in the cold, and vibrates in wind. The Sobalai listing calls this out directly, saying its rubber allows for expansion, contraction, and pipe vibration while the square base seals between the metal plate and the pipe with no gap left for air or rain. The Aothotop describes an accordion boot whose rubber seal hugs the pipe. That flexibility is the silicone boot’s edge over a rigid plate: the seal follows the pipe instead of fighting it. The base screws do the clamping work, 30 on the VIVIDA and 50 on the Sobalai, and the VIVIDA note warns not to over tighten them, since a crushed boot seals worse than a seated one. For gaps the boots cannot cover, the Therwen sheets work as patching material, and the listing even names keeping out mice and birds as a secondary use.

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Around the Woodpile

• Match the boot to the pipe OD before ordering: 6 to 11 in on the #7 boots, 7 to 13 in on the #8 VIVIDA.
• Roof pitch above 10/12 calls for a square base, per the VIVIDA listing; corrugated panels deeper than 1.5 in call for the next boot size up.
• Keep the kit complete: the boots ship with 30 or 50 roofing screws and at least one hex socket.
• Sheet flashing stores flat and dry, and the Therwen sheets cut to size with tin snips for patching around chimneys and skylights.

Frequently Asked Questions

What size pipe flashing do I need for a chimney?

Measure the pipe’s outside diameter and pick a boot whose stated range covers it: 6 to 11 in on the #7 boots here, 7 to 13 in on the #8 VIVIDA. Note the Sobalai title says 6 to 9 in while its bullets say 6 to 11 in, so confirm before buying. The Selkirk is instead sized for a 6 in chimney with an 8.1 in opening for double wall pipe.

Can a silicone boot go on a wood stove chimney?

The listings say yes within their limits: the VIVIDA names chimneys, exhaust vents and woodstoves among its uses, and the Sobalai names chimney pipes and high-temperature ventilation openings. Stay inside the stated temperature range, +500 F maximum on the Sobalai and Aothotop and 446 F on the VIVIDA, and have a certified pro do the roof work.

Boot flashing or sheet flashing for a metal roof?

A boot for a round pipe: the cone hugs the pipe and the square base molds to the roofing ribs. Sheet flashing for patching, layering and odd shapes around chimneys and skylights. The Therwen pack gives 20 sheets at 5 x 7 in for that kind of work.

Do I need a different flashing for a corrugated roof?

The boots here are made for it: flexible square bases that mold to the rib lines. The VIVIDA listing adds that deep corrugated panels over 1.5 in need the next boot size up. For a standing seam or flat profile the same square base still applies, since the base, not the ribs, does the sealing.

How long does chimney flashing last?

No listing here states a service life. The Therwen listing does warn that its aluminum surface turns black after long rain exposure and needs replacing in time. For the boots, the stated temperature range and the warranty term, 2 years on the Sobalai, are the only durability figures the listings give.

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