Roofing tar is a thick, black sticky material used to hold roof layers together and seal cracks. It is one of the oldest roofing materials still used today. Roofers spread tar between layers of felt or shingles to create a waterproof barrier. The tar hardens over time and protects your roof from rain and weather damage. Most tar roofs last between 20 and 30 years if cared for properly.
What Is Roofing Tar Made of?
Roofing tar is made from bitumen, a dark oil product left over from refining crude oil. Manufacturers heat the bitumen and mix it with gravel or sand to make it thicker and stronger. This mixture sticks to roof surfaces and hardens as it cools. The gravel helps protect the tar from sun damage and wear.
Some modern tar products also contain polymers to make them more flexible and durable. These products can stretch and move with your roof as temperatures change.
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Where Do Roofers Use Tar?
Roofers use tar in built-up roofing systems, also called BUR roofs. According to industry data, built-up roofing systems typically last between 15 and 30 years. These roofs work best on flat or low-slope buildings like commercial properties and apartment complexes. The tar is spread in layers with felt between each layer to create a strong, waterproof surface.
Roofers also use roofing tar to seal cracks and gaps in existing roofs. It fills holes around vents and chimneys. Tar works as a quick patch for leaking areas on older roofs.
Tar Vs. Other Roofing Materials
Tar roofing is cheaper than many other options. According to RubyHome, asphalt shingles cost between $4.25 and $4.95 per square foot, while tar-based built-up systems are comparable in price. However, asphalt shingles are more common today, used in about 80 percent of residential projects in the United States.
Metal roofing lasts much longer than tar roofing, staying strong for 40 to 80 years. But metal costs more upfront. According to RubyHome, metal roofing installation ranges from $10 to $17.05 per square foot. Tar remains popular because it is affordable and reliable for flat commercial roofs.
| Roofing Material | Cost per Sq. Ft. | Lifespan |
|---|---|---|
| Tar (Built-Up) | $5.50, $7.50 | 15, 30 years |
| Asphalt Shingles | $4.25, $4.95 | 20, 30 years |
| Metal Roofing | $10.00, $17.05 | 40, 80 years |
| Slate Tiles | $12.00, $22.00 | 60, 150 years |
Tar Roof Maintenance Tips
Tar roofs need regular care to last their full lifespan. Clean your gutters and remove debris twice a year. Look for cracks or bubbles in the tar surface from the ground using binoculars. According to industry recommendations, you should have a professional inspect your roof at least once a year or after major storms.
Watch for water spots on your ceiling, which signal leaks. Address tar roof damage quickly before it spreads. A small tar patch costs far less than a full replacement.
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If you need help with your roof, reach out to a trusted roofing contractor for clear pricing and reliable service.