Yes, roofing tar is flammable. Roofing tar catches fire easily because it is made from petroleum products. Most roofing tar will ignite at temperatures between 400 and 500 degrees Fahrenheit. You should handle it with care and keep it away from heat sources and open flames. Roofing contractors and homeowners need to know this fact for safety reasons.
What Makes Roofing Tar Flammable?
Roofing tar comes from crude oil. This makes it a petroleum product, just like gasoline and diesel fuel. Petroleum products burn easily when they get hot enough.
The tar melts and becomes sticky when heated during installation. This heat helps it stick to your roof. But if the temperature gets too high, the tar will catch fire instead. Most roofing tar starts to smoke at around 300 degrees Fahrenheit.
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How Hot Does Roofing Tar Need to Be to Burn?
Roofing tar ignites between 400 and 500 degrees Fahrenheit. This is called the flash point. The flash point is the lowest temperature where a liquid gives off enough vapor to catch fire.
Built-up roofing systems use hot tar that can reach 500 degrees Fahrenheit or higher during installation. Workers must be very careful when handling hot tar kettles. A small spark or flame can cause a major fire on a rooftop.
Safety Tips for Handling Roofing Tar
If you work with roofing tar, follow these safety rules:
- Keep open flames away from tar kettles
- Do not smoke near hot tar
- Use proper ventilation when heating tar
- Wear fire-resistant clothing
- Keep a fire extinguisher nearby
- Never leave hot tar unattended
According to the U.S. Bureau of Labor Statistics, roofing remains one of the most hazardous jobs in construction. In fact, roofing fatalities account for about 5.75 deaths per 1,000 workers. Fires started by roofing tar can cause serious injuries and even death.
Modern Roofing Alternatives
Many contractors now use safer alternatives to hot tar roofing. According to IBISWorld, the U.S. roofing contractor industry reached $81.3 billion in 2025. Single-ply roofing systems like TPO and EPDM do not require hot tar application.
Metal roofing and asphalt shingles are also popular options. According to industry data, asphalt shingles dominate about 80% of residential projects in the U.S. These materials are much safer to install than traditional hot tar systems. Metal roofing holds about 10% of the market share. Both avoid the fire risk that comes with heating tar to 500 degrees Fahrenheit.
If you are planning a roof replacement, ask your contractor about safer materials. According to the National Association of Home Builders, roof replacement can provide a return on investment of up to 110% at home resale. Choosing a safer installation method protects your home and your workers at the same time.
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Contact a qualified roofing contractor for expert guidance on roof repair, replacement, or installation.