An aluminum pipe boot is the flashing that surrounds pipes poking through your roof, designed to keep water from seeping in where the pipe meets the roof surface. Leaks often happen because the rubber or silicone collar that seals around the pipe can dry out, crack, or shrink over time due to sun and weather exposure, creating gaps for water to enter. Another common cause is improper installation, where the boot isn’t seated correctly under shingles or flashing, or the aluminum part can corrode and develop holes. You can check for leaks yourself by visually inspecting the pipe boot after heavy rain or during a wet weather event—you may notice water stains or even dampness inside your attic. Look closely at the rubber collar for cracks or brittleness and see if water is pooling around the boot on the roof. Avoid peeling back shingles or doing anything that might void your roof warranty.
If your DIY check reveals damage like a worn collar or rusted metal, applying roof sealant around the boot can sometimes temporarily stop leaks, but this isn’t a long-term fix. For a proper repair, it’s best to call a professional roofer, especially if the flashing underneath the shingles looks damaged or if you’re unsure about safely working on your roof. When speaking to your contractor, ask if they will replace the entire pipe boot or just repair the collar, and how they’ll make sure the new boot is sealed properly to last years without leaks. Also, inquire whether their work will affect your roof’s warranty and if they provide a warranty for the repair itself.