Does Drip Edge Go Over or Under Tar Paper?
I recently had the pleasure of helping a friend replace the roof on her home. As we were working, we came across a question that neither of us could answer: does drip edge go over or under tar paper?
After a bit of research, we found that the answer is not as straightforward as we thought. In this article, I will explore the topic of drip edge and tar paper in detail, so you can make an informed decision about your own roofing project.
What is Drip Edge?
Drip edge is a thin metal strip that is installed along the edge of a roof. It helps to prevent water from dripping off the roof and damaging the fascia and soffit. Drip edge can be made from a variety of materials, including aluminum, copper, and steel.
How is Drip Edge Installed?
Drip edge is typically installed before the roofing material is laid down. It is nailed into the roof deck along the eaves and rakes of the roof. The drip edge should extend at least 1 inch over the edge of the roof deck.
What is Tar Paper?
Tar paper is a waterproof material that is used as an underlayment for roofing. It is made from asphalt-impregnated paper. Tar paper helps to protect the roof deck from water damage and provides a smooth surface for the roofing material to be applied.
Tar paper is typically installed in two layers. The first layer is laid down parallel to the eaves of the roof. The second layer is installed perpendicular to the first layer.
Pros of Installing Tar Paper Under Drip Edge
- Prevents water from seeping underneath the drip edge and damaging the fascia and soffit.
- Creates a smoother surface for the drip edge to be installed.
- Helps to protect the roof deck from water damage.
Cons of Installing Tar Paper Under Drip Edge
- Can be difficult to install, especially on steep roofs.
- Can tear easily if not installed properly.
- May not be necessary in all climates.
So, Does Drip Edge Go Over or Under Tar Paper?
The answer to this question depends on a few factors, including the climate you live in and the type of roofing material you are using.
In general, drip edge is installed over tar paper in cold climates. This helps to prevent ice dams from forming on the roof. Ice dams can occur when water seeps under the drip edge and freezes. As the ice builds up, it can cause the roof to leak.
In warm climates, drip edge can be installed either over or under tar paper. However, it is important to note that tar paper is not as effective in preventing water damage in warm climates as it is in cold climates.
If you are using a roofing material that is not waterproof, such as asphalt shingles, then it is important to install tar paper under the drip edge. This will help to protect the roof deck from water damage.
Conclusion
The decision of whether to install drip edge over or under tar paper is a complex one. There are a number of factors to consider, including the climate you live in, the type of roofing material you are using, and the pitch of your roof.
If you are unsure about how to install drip edge, it is best to consult with a roofing professional. They can help you make the best decision for your specific needs.
Are you interested in learning more about drip edge and tar paper? Let me know in the comments below!
