If your roof is leaking in the attic around the area where the neoprene pipe is located in the bathroom, it is time to replace the seal. Changing the seal, appropriately called a collar, requires a specific set of tools and some bravery as you need to climb up on the roof. This guide explains the steps to replace the collar to prevent more leaks.

Step 1: Measure the Pipe and Purchase Your Supplies

Use a measuring tape to measure the inside diameter of the pipe. Do this before heading to the store to pick up the following supplies.

• hammer
• caulk gun
• hook-blade utility knife
• neoprene pipe collar (to fit the pipe measurement you took)
• asphalt mastic caulk tube
• flat pry bar
• roofing nails
• ladder

Step 2: Remove the Existing Collar

Set up the ladder in a safe position outside. Climb the ladder and use the pry bar to loosen the shingles around the pipe gently. Once you have loosened them, remove the nails with the pry end of the hammer. Only remove enough shingles to expose the collar completely. When you see the full collar, lift it up with your hands and discard it.

Step 3: Slide on the New Collar

Slide the new vent pipe collar over the pipe and onto the roof. Make sure that the collar stretches a little to accommodate the pipe, yet remains tight against it. When it reaches the roof, it should sit flat on the surface.

Insert the asphalt mastic into the caulking gun and apply a small amount under the flange, where you are about to nail the new collar down. Hammer in the nails around the same location that the old ones were but not in the exact location. Those nail holes are compromised and the nails won't stay in.

Step 4: Replace the Shingles

Nail the shingles back into place with the hammer. Again, make sure that you don't use the same nail holes. You want the shingles to be tight against the roof in case of high winds. Apply more asphalt mastic to the leading edge of the shingle beginning at the shingle tab. This action provides more protection against wind damage.

Perform this task as soon as you begin to see water leaking from the area so that permanent damage does not occur. Call your roofing professional if you run into any problems with this project. If you are so inclined, add a little polyurethane caulking around the nail holes in the shingles, as well as around the pipe and collar for added protection.

For more information, or if you would like professional assistance, contact DLD Roofing or a similar company.