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A pipe boot flashing, often called a roof boot, is a flexible cone of ethylene propylene diene monomer (EPDM) rubber or silicone bonded to a flat base. Its job is to seal tightly around round penetrations, such as pipes, conduit, and masts, where they pass through a metal roof, to keep water out and interiors dry. Plumbing vents, HVAC exhausts, radon pipes, and electrical service masts are common leak points on metal roofs, so the fit, material, and base style must all be taken into account.
Supply Maverick stocks a full lineup of EPDM high-temperature silicone, retrofit, and extreme-angle pipe boot flashings built for metal roofing. Whether you install every day or you're tackling a weekend project, you'll find all the hard-to-find sizes and configurations here. Need it fast? Most orders placed before 12 p.m. EST ship the same day.
Choosing the right boot comes down to three variables: what the pipe carries, roof pitch, and exhaust temperature. Material and base design handle those conditions differently. If you're unsure, our team can help you match the correct boot to your panel profile and application.
EPDM rubber is the go-to choice for most plumbing vents. It stays flexible, resists weathering, and is rated for continuous service up to 212°F, with short-term tolerance a bit higher. That makes it a dependable fit for cold- and warm-water supply vents, drain-waste-vents (DWV) stacks, and radon exhaust pipes.
These models use round bases that conform to common metal panel profiles. Colored options available in green, black, or brown help the boot blend with your panels for a clean finish. Each cone includes pre-marked, inch-graduated rings so you can trim it on-site with snips or scissors to match the diameter precisely.
Hot exhaust calls for silicone. Wood-stove pipes, furnace flues, and gas appliance vents run too warm for standard EPDM, which hardens and fails under sustained heat. Our silicone boots are rated for continuous temperatures up to 500°F and hold up under those conditions.
Dark gray is the common silicone color for high-heat applications. Beyond heat resistance, silicone withstands UV exposure better than EPDM, which can extend service life in sunny climates. These options come with round bases that seat firmly on standard metal panel profiles.
If a cap, fitting, or masthead blocks the path so you can't slide a standard cone over the top, retrofit (zipper-style) boots solve the problem. A zipper seam opens the cone so you can wrap it around the pipe, close it, and seal the joint without disassembling the pipe, saving you time and avoiding unnecessary cutting.
Match the design to the roof type. The ZipSeal boot is intended for electrical service masts on asphalt shingle roofs and is ideal for common residential repairs. For metal roofs requiring a retrofit, choose the SpringSeal Metal Roofing Pipe Flashing to match the panel geometry and maintain a dependable seal.
Steep-slope metal roofs (generally 8:12 and higher) put standard bases in a bind. On these pitches, a wider, more angled base lets the boot sit flat on the panels without twisting the cone or stressing the seal.
The Dektite Extreme Angle boot is built for this scenario. Its flexible aluminum collar bends to the panel ribs and corrugations so the base lies flat and the collar grips evenly, helping to preserve a watertight seal on aggressive slopes.
Accurate sizing is the foundation of a long-lasting seal. Measure the outside diameter (OD) of the pipe, then pick a boot whose rated range puts your pipe OD near the middle. A cone stretched to its limit won't last.
During installation, trim the cone slightly smaller than the measured OD, then slide it down for a snug, even fit. If you overshoot and the opening ends up too large, replace the boot rather than trying to force a seal. For any pipe that runs hot, such as those on stoves, furnaces, and gas appliances, use silicone regardless of size. EPDM degrades under sustained temperatures above 212°F.
| Boot Size | Pipe OD Range (Round Base) | Pipe OD Range (Square Base) | Best For |
| #1 | 1/4" – 2-1/2" | 1/4" – 2-3/4" | Small conduit, thin vent pipes |
| #2 | 1-3/4" – 3-1/4" | 7/8" – 4" | Standard 2" plumbing vents |
| #3 | 2-1/4" – 5" | 1/4" – 5-3/4" | Standard 3"–4" plumbing vents (most common) |
| #4 | 3" – 6" | 2-3/4" – 7" | Large plumbing vents, small HVAC pipes |
| #5 | 4-1/4" – 7-3/4" | 4" – 8-1/4" | Medium HVAC exhaust pipes |
| #6 | 5" – 9" | 4-3/4" – 10" | Large HVAC exhaust pipes |
Note: Sizes #7-#9 cover commercial-scale pipes up to 19" OD. Contact Supply Maverick for availability.
Temperature and sun exposure drive the choice. Use this quick comparison to zero in on the right material.
| Feature | EPDM Pipe Boot | High-Temp Silicone Pipe Boot |
| Max Continuous Temp | 212°F (up to 275°F short-term) | 500°F |
| UV Resistance | Good | Excellent |
| Typical Lifespan | 10–15 years | 15–20+ years |
| Best Application | Plumbing vents, radon pipes, conduit | Stove pipes, furnace flues, gas appliance vents |
| Cost | More budget-friendly | Premium |
| Color Options | Multiple (black, gray, green, brown, etc.) | Typically dark gray or red |
A simple rule to remember is if the pipe feels hot to the touch during normal operation, choose silicone. If it stays cool or near room temperature, EPDM is the better match.
We're the dedicated e-commerce arm of Mid-Michigan Metal Sales, a long-standing manufacturer of metal building components. That backing gives us deep product knowledge and the ability to guide you to the right boot for your roof.
We stock the hard-to-find sizes, colors, and configurations you won't see at big-box retailers, and most orders placed before 12 p.m. EST ship the same day. We ship to the US, Canada, Australia, and New Zealand, so whether you're sourcing for a single residential repair or coordinating materials across multiple job sites, we keep your projects moving.
Our goal is simple: offering premium, hard-to-find items at prices that won't break the bank. Contractors and commercial buyers will find wholesale pricing, bulk-quantity discounts, and Net 30 accounts available for B2B purchases. Not sure which boot is right for your job? Reach out and include the specific product name or SKU, and our team will help you get it right.
Standard EPDM boots typically last 10 to 15 years, depending on UV exposure, climate, and the rubber compound. In hot, sunny regions, surface cracking can appear in about eight to 10 years.
Silicone boots usually last 15 to 20+ years thanks to stronger UV resistance. Because a well-built metal roof can last 40 to 70 years, plan on inspecting and replacing boots a couple of times over the roof's life.
Watch for splits or cracks in the cone, a chalky or brittle feel, or the cone pulling away from the pipe. Inside the building, water stains below the penetration are another warning sign. Outside, a lifted or dented base flange also points to failure. If you see any of these issues, replace the boot promptly, as compromised boots are a common source of interior water damage on metal-roofed structures.
Yes. In most cases, it's a straightforward maintenance task that doesn't require removing adjacent panels. Retrofit zipper boots go on without disconnecting the pipe. For standard boots, back out the fasteners, slide off the old cone, and install the new one. If working on a metal roof isn't in your comfort zone, consult a qualified local installer.
You do. Metal roof boots incorporate a flexible aluminum base collar that bends to match panel ribs and corrugations. Shingle boots use a flat base designed to slip under courses of shingles. Mixing them leads to poor contact and leaks. Unless noted otherwise in the product description, the boots in our catalog are designed for metal roofing.
Use self-drilling metal-to-metal screws with bonded EPDM sealing washers. Place them in a staggered pattern around the base flange at roughly 1" on center. Tighten until the washer compresses evenly without distorting the base. A thin bead of compatible roofing sealant under the flange and around the trimmed cone adds extra protection. For product ideas, browse our roofing fasteners.
