DIY Network

How to Seal a Cracked Vent

Learn how to seal a cracked roof vent with these basic step-by-step instructions.

More in Remodeling

  • Time

    Under Half Day

  • Price Range

    $50 - $100

  • Difficulty



Step 1: Attach the Vent Sleeve

First slide the storm collar over the top of the sleeve. Slide it down low enough to accommodate room for the rain cap.

Carefully slide the vent sleeve into the pipe. This will take the place of the existing vent.

Tip: Avoid disturbing any asbestos in the lining of the pipe.

Step 2: Seal the Vent

Seal the storm collar in place with caulk. Apply liberally to ensure a tight, waterproof seal. Run your finger along the seam to ensure adhesion.

Top off the vent with the rain cap.

Step 3: Patch Further Roof Leaks

To avoid any further leaks into the home, use roofing cement to patch up any leaks in the roof.

Apply a liberal amount of cement around any holes or cracks around the roof flashings.