Is Roofing Tar Safe? The Truth About Flat Roof Materials in Tampa

Roofing tar has been used for decades in flat roof systems — but is it safe? If you live in Tampa or Greater Carrollwood and are dealing with an aging flat roof, it’s important to understand the health, ventilation, and waterproofing concerns that come with tar-based systems. This guide breaks down roofing tar risks, its impact on air quality, and safer alternatives like TPO and modified bitumen for better roof longevity in Florida’s harsh weather.

What Is Roofing Tar? (Definition & Uses)

Roofing tar is a thick, sticky sealant made from coal tar or asphalt, both of which are petroleum byproducts. In the past, it was widely used in construction for waterproofing flat roofs, especially in built-up roofing (BUR) systems where tar paper was layered with felt and applied using a hot mop.

While still used in maintenance and patch jobs today, it's largely been replaced by newer materials due to growing awareness of toxicity, inhalation risks, and poor energy efficiency.

Want to explore modern flat roof systems? Check out our guide on commercial flat roof systems in Tampa.

Coal Tar vs. Asphalt Tar

• Coal Tar: Derived from oil and coal, it contains volatile organic compounds (VOCs) like benzene, hydrogen sulfide, and sulfur. Long-term exposure has been linked to lung cancer, bladder cancer, and other diseases affecting the respiratory tract and skin.
• Asphalt Tar: While considered less toxic than coal tar, it still poses risks, especially when heated during application.

Both release strong fumes, particularly under high temperature or direct ultraviolet (UV) rays — a common concern in Florida.

Is Tar Roofing Dangerous? Roofing Tar Health Risks Explained

While roofing tar is effective at sealing flat roofs, it does come with health and safety risks especially during installation. Because tar must often be applied at high temperatures, it releases fumes that can irritate the body and create fire hazards. Long-term exposure is mostly a concern for roofing professionals, but property owners should still be aware of the short-term effects.

Common Health and Safety Concerns:

• Eye, nose, and throat irritation
• Headaches or nausea from fumes
• Risk of burns during hot application
• Increased fire hazard due to open heat sources
• Long-term risk of cancer and DNA damage in roofers due to chemical exposure

Tar contains organic compounds that can impact indoor air quality if applied without proper ventilation. Those with asthma, bronchitis, or sensitivity to strong odors may experience breathing issues during or after installation.

Explore how Tampa’s flat roofs respond to storm damage

Indoor Safety Risks of Roofing Tar

For most Tampa property owners, the risk from roofing tar is short-term and odor-related rather than long-term. Building occupants are unlikely to face cancer risks, but they may experience discomfort while tar is being applied.

• Strong odors may cause headaches, nausea, or asthma flare-ups.
• Fumes can seep indoors if the roof is poorly ventilated.
• Proper ventilation during application is essential to minimize exposure.

In short, while roofing tar can be installed safely by professionals, it’s best for property owners to limit occupancy during application to avoid discomfort.

Roofing Tar Safety for Tampa Property Owners

If your flat roof still relies on tar, safety should always come first. Unlike modern roofing systems that use heat-free adhesives or single-ply membranes, tar applications involve extreme heat, fumes, and fire risks. That’s why it’s strongly advised never to attempt a DIY tar repair and always call a licensed roofing contractor.

For Tampa homeowners and property managers, here are a few smart precautions:

✔️ Schedule roofing work during off-hours – If possible, plan repairs when the building is empty (evenings, weekends, or school breaks).
✔️ Keep the area clear – Limit access to rooftop spaces and nearby outdoor areas during application.
✔️ Avoid open flames or heat sources nearby – Roofing tar is highly flammable when hot.
✔️ Use licensed professionals – Certified roofers have the training, equipment, and insurance coverage to handle the risks safely.

Protective Measures Professionals Use

At Affordable Roofing Systems, our team takes multiple steps to ensure tar applications are performed safely and in compliance with Tampa building codes:

• Personal protective equipment (PPE) – Roofers wear gloves, respirators, and protective clothing to minimize chemical exposure.
• Ventilation systems – Fans and exhaust equipment are used to prevent fumes from accumulating indoors.
• Temperature-controlled equipment – Ensures tar is heated safely and evenly without overheating.
• Proper disposal practices – Waste materials are removed and disposed of according to EPA (U.S. Environmental Protection Agency) guidelines to protect the environment.

With these precautions, the risks of roofing tar can be managed. But in many cases, modern alternatives provide a safer, longer-lasting solution for flat roofs in Florida.

Safer Alternatives for Flat Roofs in Florida

Here’s how roofing tar compares to other flat roof materials commonly used in Florida:

Why They Work in Florida

• Modified Bitumen uses heat-welded seams and offers a cleaner, safer installation than tar.
• TPO (Thermoplastic Olefin) is UV-reflective, chemical-resistant, and doesn’t involve adhesive or hot applications. It's ideal for lowering pressure on your air conditioning unit and extending roof life.

Compare flat roof systems like TPO and bitumen

Is Tar Still Used in Tampa Roofing?

In today’s roofing industry, tar is rarely used in new construction. Most Tampa flat roof installations now rely on TPO, modified bitumen, or other modern membranes that perform better in Florida’s climate. That said, roofing tar hasn’t disappeared completely. You might still find it being used on patch jobs for older BUR systems.

See how we approach full roof replacement in Tampa

Should You Replace a Tar Roof?

If your flat roof still contains tar, replacement may be worth considering—especially in Tampa, where heat, humidity, and frequent storms accelerate aging and damage. While tar can temporarily stop water intrusion, it falls short on energy efficiency, long-term durability, and modern safety standards.

Signs It’s Time to Replace Your Tar Roof

Roof Age

• If your roof is over 15–20 years old, it’s likely nearing the end of its service life.

Damage or Leaks

• Frequent leaks or patchwork repairs are clear signs that tar-based systems are wearing out.

Code Compliance

• Tampa building codes now favor energy-efficient roofing. Older tar roofs may no longer meet current standards.

Energy Costs

• Tar absorbs heat, which drives up cooling bills. Reflective alternatives like TPO roofing can help reduce energy expenses.

Schedule a roof inspection with our Tampa roofing team

Not Sure If Your Flat Roof Still Uses Tar?

A licensed roofing contractor can inspect your system and advise whether targeted repairs or full replacement is the smarter investment. We serve all of Tampa and surrounding neighborhoods like Greater Carrollwood.

9511 N Trask St Ste A, Tampa, FL 33624 | Get Directions

(813) 542-8462 | Contact Us for a Free Estimate

About Affordable Roofing Systems

This blog was written by Affordable Roofing Systems, a licensed roofing contractor based in Tampa, FL (License #CCC1326722). With over 30 years of experience, we help property owners across Tampa and Greater Carrollwood choose materials that are safe, durable, and made for Florida’s climate.

Learn more about our commercial roofing services