Tar dripping from a roof can signal failing roofing materials, trapped moisture, or failed flashing and can lead to structural damage or health risks if left unaddressed. This article explains common causes, inspection steps, temporary remedies, and durable repair or replacement options so homeowners can act quickly and safely. Understanding causes and responses helps prevent costly water damage and preserves roof performance.
| Issue | Common Cause | Immediate Action |
|---|---|---|
| Tar Bleeding | Heat softening shingles or built-up roofing | Cool surface, add reflective coating |
| Tar From Old Flat Roof | Deteriorated built-up roofing (BUR) | Apply patch or cover with membrane |
| Leaking Flashing | Broken or loose flashings around penetrations | Seal temporarily with roof cement |
Why Tar Drips From A Roof: Common Causes
Tar dripping is typically caused by heat softening of asphalt-based roofing, physical breakdown of built-up roofing systems, or failure of roof flashings and seals. Older BUR, modified bitumen, and asphalt shingles contain tar or asphalt that becomes viscous in high heat, allowing it to flow.
Roof penetrations, clogged drains, trapped moisture beneath membranes, and ponding water accelerate deterioration and can push tar through seams, vents, and weak spots. Poor ventilation and dark roof surfaces increase temperatures and tar mobility.
Health And Structural Risks Of Tar Leaks
Dripping tar is more than a nuisance: it can indicate water entry into the building envelope, mold growth, and wood rot. Tar itself can carry particulates and volatile organic compounds (VOCs) when heated, posing respiratory irritation risks during prolonged exposure.
Structural risks include deterioration of decking, insulation damage, and rust on metal components. If left untreated, tar-related leaks can necessitate expensive roof deck replacements and interior repairs.
How To Inspect A Roof For Tar Leaks Safely
Visual inspection from the ground with binoculars is the safest first step. Look for shiny or wet-looking streaks, black drips on gutters, and softened or sagging roof areas. Note locations relative to roof penetrations and valleys.
If a closer inspection is needed, use fall protection, stable ladders, and non-slip footwear. Check attic spaces for dark stains, damp insulation, or tar stains on rafters, which help trace the leak path.
Temporary Remedies To Stop Dripping Tar
- Cool The Area: Spray cooled water early morning to temporarily harden softened tar and stop immediate dripping during hot days.
- Apply Roof Cement: Use a compatible roof cement to seal small cracks or seam gaps around flashings and vents as a short-term fix.
- Install Reflective Patch: A reflective roof patch or aluminum flashing can reduce heat absorption and minimize tar flow until permanent repairs.
Permanent Repair Options
Permanent solutions depend on roof type and extent of damage. For asphalt shingle roofs, replace compromised shingles and repair flashings. For built-up roofing or modified bitumen, options include patching, overlaying with a new membrane, or full replacement.
Consider installing a single-ply membrane (TPO, PVC, EPDM) over a deteriorated tar roof for long-term performance. Ensure proper substrate preparation and ventilation to avoid trapping moisture under the new layer.
When To Repair Versus Replace
Small localized soft spots or single-penetration failures may be suitable for targeted repair. Full replacement is recommended when multiple areas show tar bleeding, deck rot, or the roof is near end of life.
An inspector or reputable roofing contractor can perform moisture scanning and decking probes to determine the roof’s remaining service life and estimate whether repair or replacement is more cost-effective.
Cost Considerations And Typical Price Ranges
| Repair Type | Typical U.S. Cost Range |
|---|---|
| Minor Tar Patch / Flashing Repair | $150 – $800 |
| Partial Reroof / Localized Replacement | $800 – $3,500 |
| Full Roof Replacement (Asphalt/ BUR) | $5,000 – $25,000+ |
Costs vary by roof size, accessibility, materials, and local labor. Roofing warranties and insurance may cover sudden damage but typically not deterioration from age.
Choosing A Contractor And What To Ask
Select licensed, insured roofers with experience on similar roof systems. Request references, proof of insurance, and multiple detailed estimates. Check local reviews and licensing boards for complaints.
Key questions: Are there photos of similar completed jobs? Is there a written warranty? What are moisture scan findings and recommended scope? Insist on a written contract specifying materials, ventilation improvements, and cleanup responsibilities.
Prevention And Maintenance To Avoid Future Tar Dripping
- Regular Inspections: Inspect twice yearly and after major storms for early signs of bleeding, cracking, or clogged drains.
- Improve Ventilation: Adequate attic ventilation reduces roof deck temperatures and slows tar mobility.
- Use Reflective Coatings: Cool roof coatings or light-colored membranes reduce surface heat and tar softening.
- Clear Debris: Keep gutters, drains, and scuppers clear to avoid ponding that worsens membrane breakdown.
DIY Safety Checklist
- Never Work Alone: Have someone on-site for emergencies.
- Use Fall Protection: Harness, proper anchor points, and ladder stabilizers are essential.
- Avoid Hot Conditions: Work early morning or cool days to limit tar flow.
- Wear Protective Gear: Gloves, respirator for fumes, and eye protection are recommended.
Signs A Professional Is Needed Immediately
Call a roofing professional if there is active dripping into living spaces, large soft or sagging roof areas, visible deck rot, or mold and mildew in the attic. These signs indicate compromised structural elements and potential safety hazards.
Insurance And Warranty Tips
Review homeowner insurance for sudden roof damage coverage. Most policies exclude wear-and-tear from deferred maintenance. Keep documentation of inspections and repairs to support claims.
Manufacturer and contractor warranties differ in coverage and duration. Confirm what voids a warranty—such as overlays without proper substrate preparation—and get warranties in writing.
Further Resources And Tools
Homeowners should consult local building codes, manufacturer installation guides, and resources from the National Roofing Contractors Association (NRCA) for technical guidance. For moisture diagnostics, infrared scanning can identify hidden wet areas before costly replacement.
Prompt action, correct diagnosis, and appropriate repairs prevent escalation from a dripping tar stain to structural failure.