Flashers Silicone High Temp Round Flexible Roof Jack Pipe Boot Review
✅ PROS
- Withstands continuous heat up to 400°F (and spikes to 500°F) — safe for wood stove and furnace exhaust pipes
- True silicone construction stays flexible in sub-zero temps, unlike rubber boots that crack after one winter
- Fits 1–6 inch diameter pipes with a tight, self-sealing collar that conforms to oval or slightly off-round pipe
❌ CONS
- No pre-cut holes — you must trim the collar yourself, and a dull blade will tear the silicone
- The bright red color stands out against most dark roofing; painting it voids the heat warranty
- Not rated for direct flame or Class A chimney pipe — read the fine print before installing on a wood stove
The Verdict
The Roof Boot That Doesn’t Crack, Melt, or Leak (Usually)
Most pipe boots are rubber. They crack in two winters, bake into brittle messes near heat sources, and turn a simple roof penetration into a recurring leak. This Flashers silicone boot exists to end that cycle — and with 229 ratings averaging 4.6 stars, it’s doing a decent job.
What You Actually Get
One molded silicone boot, round base, one flexible collar. The base measures roughly 12 inches square — enough to cover a standard hole cut for a 1- to 6-inch pipe. The collar is the key feature: it’s not a pre-sized ring but a continuous sleeve you trim to match your pipe’s outer diameter. That’s why it fits odd sizes (like 3.5-inch furnace vent pipe) that standard boots never handle.
The silicone is thick — about 3/16 inch — and noticeably heavier than the cheap rubber boots at big-box stores. It handles continuous heat up to 400°F with 500°F spikes, which covers most exhaust and wood stove pipes (but not Class A chimney pipe, which exceeds that range).
Real-World Performance
Installation is straightforward: cut the collar to size, slide it over the pipe, screw the base down, and seal the edges with roof cement or butyl tape. The silicone flexes to follow the pipe’s angle — up to about 30 degrees off vertical — which is a lifesaver when your vent pipe doesn’t sit perfectly plumb.
Buyers consistently report the obvious win: no leaks after heavy rain or snow. One reviewer put it simply: “Replaced a rubber boot that had cracked after one winter. This one flexed in -10°F temps without splitting. Two years in, still watertight.” Another noted the heat tolerance matters: “Used on a wood stove pipe. The old boot was literally crumbling from heat. This one shows zero signs of degradation after a full season.”
The flexibility also earns repeated praise. “My pipe is slightly oval, not round. The collar just squeezed around it and sealed tight. No gaps, no caulk needed around the pipe itself.”
Where It Falls Short
The trimming step trips people up. The collar is thick — that’s why it lasts — but it doesn’t yield to scissors. A utility knife with a sharp blade is mandatory. Dull blades drag and tear the silicone, leaving a ragged edge that won’t seal properly. Several reviewers mentioned this, and it’s a genuine frustration, not a nitpick.
Second, the color. It’s bright red. On a dark asphalt shingle roof or a gray metal roof, it’s visible from the street. Painting it voids the heat warranty, so you’re stuck with the color unless you’re okay sacrificing that protection.
Third, the heat rating has limits. It’s rated for 400°F continuous, but wood stove flues can exceed that near the stove itself. This boot belongs on the roof penetration, not close to the appliance. Read the spec sheet carefully before committing.
Who Should Buy This
- Wood stove owners with a roof penetration that needs a heat-resistant, flexible seal
- Metal roof installations where standard rubber boots don’t conform to standing seams or odd pipe angles
- DIYers replacing cracked rubber boots who want a one-time fix rather than a seasonal repair
FAQ
Q: Can I use this on a Class A chimney pipe?
A: No. Class A pipe exterior temperatures exceed 500°F. This boot is designed for single-wall stove pipe, B-vent, and furnace exhaust. Use a purpose-built Class A boot for chimney systems.
Q: Does the silicone need caulk around the base?
A: The base has pre-drilled screw holes and lies flat, but roof cement or butyl tape around the perimeter is recommended for a permanent seal — especially on rough surfaces like corrugated metal.
Q: Will the collar seal a pipe that’s slightly out of round?
A: Yes, that’s the main advantage over rigid boots. The silicone squeezes around minor irregularities and springs back to maintain contact.
The Verdict
Buy it if: You need a heat-tolerant, flexible boot that survives extreme cold and won’t crack like rubber. It’s the right choice for metal roofs, odd pipe angles, and wood stove venting.
Skip it if: You want a color that blends with your roof, you’re working with Class A chimney pipe, or you don’t want to spend 10 minutes carefully trimming the collar to size.
Rating: 4.6/5 — The heat tolerance and flexibility justify the price premium over rubber boots. Just bring a sharp knife and a healthy respect for the color red.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.