Pipe flashings seal vent pipes, flues and other round penetrations through a metal roof. Send the pipe size, panel profile and roof pitch, and we’ll quote the right flashing with the rest of your order.
Ask us about this line: call or send a quote request and we will tell you what we can supply.
How pipe flashing works on metal
A pipe boot is a flexible cone with a wide base. The cone slides over the pipe and is trimmed to size. The base bends to follow the panel’s shape and is sealed and screwed to the roof. A clamp or the cone itself grips the pipe.
Choosing the right boot
- Size up. Don’t use a boot that barely fits the pipe. A larger range leaves room for the roof slope and for panel movement.
- Hot pipes. Furnace flues and wood stoves need a silicone boot. Standard EPDM can break down at high heat.
- Base shape. Square and round bases both work. Pick the one that sits flattest on your panel profile.
- Retrofit boots. Split or zipper boots go around a pipe you can’t slip a cone over.
Placing the flashing
Put the boot in the flat of the panel, clear of the seams. Keep the base out of the side laps too. Water should flow around it on both sides. For large penetrations or pipes that land on a seam, ask the panel maker for a detail. Seal the base with sealant made for metal roofing, then fasten it as the boot maker shows.
Questions
Do you keep pipe flashing in stock?
Call us or add it to a quote. We quote pipe flashing for each job, based on the pipe size and the roof.
EPDM or silicone?
EPDM for standard vent pipes. Silicone for hot flues and stove pipes.
What can I do if the pipe lands on a seam?
Avoid it if you can by moving the panel layout. If you can’t, follow the panel maker’s detail for a penetration through a seam.
What do I seal the base with?
A sealant made for metal roofing. See our metal roof sealants.
Need the rest of the roof? See metal roofing accessories and our coil and sheet stock.