To do torch on felt roofing, you heat the felt with a propane torch to melt the tar and seal it to the roof below. This method is common for flat or low-slope roofs. Torch-on felt, also called built-up roofing or BUR, has been used for decades. According to This Old House, built-up roofing lasts 15 to 30 years. It is popular because it is tough and handles weather well. Many roofers still use this method today.
What Tools Do You Need?
You need a propane torch, a regulator, and propane cylinders. You also need safety gear like gloves, goggles, and a fire extinguisher. The torch heats the felt to about 300 to 400 degrees.
Wear long sleeves and pants. Never work alone. Have water nearby in case of fire.
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How Do You Apply Torch-on Felt?
First, clean the roof surface of dirt and debris. Next, unroll the felt slowly as you heat it with the torch. The torch should be held at an angle, about 6 to 12 inches from the felt. Heat the felt evenly so it sticks to the base layer.
Push the felt down as it heats. Make sure there are no air bubbles or wrinkles. Overlap each row by at least 6 inches. This keeps water from seeping through the cracks. According to RubyHome, the average roof replacement costs between $5,868 and $13,217. DIY work can save about 50 percent, but mistakes cost more in the long run.
Why Do Roofing Jobs Matter?
According to IBISWorld, the U.S. roofing contractor market reached $81.3 billion in 2025. Roofing is critical because a bad roof lets water inside. Water damage ruins walls, insulation, and ceilings fast. According to the National Association of Home Builders, 92 percent of homeowners consider the roof a top 3 home improvement priority.
Torch-on felt is one way to build a strong roof. According to ConsumerAffairs, about 80 percent of roofing work today focuses on renovation and replacement rather than new builds. This shows how important roof upkeep is.
Safety Tips for Torch Work
- Never torch-on felt near trees or wood structures
- Keep the propane tank away from the heat source
- Wear a respirator to avoid smoke
- Stop work if it rains or is too windy
Roofing is hazardous. According to the U.S. Bureau of Labor Statistics, roofers face one of the highest fatality rates in construction. Over 50 percent of all construction fall deaths involve roofers. Always hire a licensed pro if you are not trained. Torch-on felt work requires skill and experience to do it right and stay safe.
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If you need help with your roof, reach out to a trusted professional roofer for clear pricing and reliable service.