How To Install Roofing Paper

November 30, 2025

2 min read

dilshadakram

To install roofing paper, you first lay it flat on top of the roof deck, then nail or staple it down in overlapping rows. Roofing paper, also called tar paper or felt underlayment, is a key layer that sits between your roof deck and shingles. It helps keep water out and protects your roof from damage. Most homes need this step before installing shingles. The average roof replacement costs between $5,868 and $13,217, according to RubyHome (2025), so doing this step right saves money on future repairs. Let’s walk through how to do it correctly.

What Is Roofing Paper?

Roofing paper is a thick, waterproof material that stops leaks. It acts like a shield under your shingles.

There are two main types. Fifteen-pound felt is lighter and cheaper. Thirty-pound felt is thicker and lasts longer.

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How Do You Start Installation?

Start at the bottom edge of your roof. Unroll the paper from one side to the other. Make sure the bottom edge lines up with your roof edge.

Nail or staple the paper every 6 inches along the bottom. Use roofing nails or staples made for this job. Don’t pull it too tight. Let it sit naturally on the deck.

According to RubyHome (2025), roof installation costs range from $4 to $40 per square foot, so using the right materials and methods matters. A 1,700 square foot roof costs between $6,800 and $68,000 depending on material choice.

How Do You Overlap the Rows?

Move up to the next row above. Overlap the new paper at least 2 inches over the row below. This overlap stops water from running between the layers.

Keep going row by row until you reach the roof peak. At the peak, overlap the paper from both sides by at least 6 inches.

Most roofs last between 25 and 50 years, according to industry data. Good underlayment installation adds years to your roof’s life.

Installation Tips and Common Mistakes

Here are key steps to follow:

Step	What to Do
Check the deck	Make sure it’s clean and dry before starting
Roll it smooth	Push out air bubbles as you go
Nail spacing	Place nails 6 inches apart along edges
Overlap rows	Always overlap at least 2 inches
Work safely	Wear a harness on steep roofs

Don’t skimp on fasteners. Bad installation causes leaks that cost more to fix later. According to RubyHome (2025), basic asphalt shingles cost $4.25 to $4.95 per square foot, so protecting them with good underlayment makes sense.

Roofing is dangerous work. Over 50% of all construction fall deaths involve roofers, according to OSHA 2024. Always use fall protection and work with a partner when possible.

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If you need help with your roof, reach out to a trusted professional roofer for clear pricing and reliable service.