How to Replace a Damaged Roof Jack

What You'll Need
New roof jack
Galvanized roofing nails
Roof shingles (optional)
Pry bar (optional)
Work gloves (optional)

A roof jack is an external vent that connects via vent pipes or tubing to your kitchen stove or bathrooms. The roof jack prevents water from coming into the house by creating a seal around the vent pipe protruding through the roof. A roof jack can become damaged by animals chewing the lead material or by branches hitting it. Replacing a damaged roof jack is not a difficult procedure and a job that most homeowners can do themselves.

Step 1 – Preparation

The first step to replacing a damaged roof jack is to measure the size of the existing roof jack to make sure you purchase the correct size. Place your ladder securely against the roof eave and climb up on the roof. Find the damaged jack and take measurements of its height and pipe diameter. Take these measurements to your local home improvement store and buy the new jack.

Once home, gather the tools and materials you need and climb the ladder back to the roof.

Step 2 – Lift Toof Shingle

Gently lift the roof shingles from the damaged roof jack. You can use the pry bar here if necessary. Remove the nails holding the shingles and slide the shingles out of the way. Pry the damaged roof jack loose and slide it up and off the roof vent pipe.

Step 3 - Slide New Jack

Slide the new roof jack over the vent pipe and secure it to the roof using the galvanized nails. If you can reuse the old shingles, slide them back into place over the base of the roof jack. If you can't use the old shingles, cut new shingles to fit around the roof jack and nail them into place. The nails should be covered by the shingles above them.

Step 4 - Secure

The last step is to gently tap the edge of the new roof jack to bend the sharp edges into the jack itself.

And that's it; you've just added another home improvement job to your list of accomplishments.

Tips and Warnings

  • Keeping your tools in a tool belt or a bucket makes it easier and safer climbing on the ladder and working on the roof.
  • When working on a roof, never reach for any tool that has slipped from your hand. Let it fall and safely climb down the ladder to retrieve it.
  • For very steep roofs, you might want to use a safety rope or other safety measures.
  • Work gloves are recommended when working around the sharp metal edges of the roof jack.
  • After replacing your roof jack, scan the rest of your roof for any other damages while you are on the roof. Check for any loose or damaged shingles or any other issues that need addressing.
  • A roof vent cap can be added to the roof jack to prevent debris or small animals from entering the vent and clogging up the vent and/or the vent pipe.