The short answer
How Water Activates Roofing Tar
Water from a roof leak can reach the hot, tar-based layer of your roofing system, such as asphalt-saturated felt or adhesive used under shingles. As this water heats up under the sun or in a warm attic space, it essentially steams the tar compounds. This process releases volatile organic compounds, or VOCs, into the air, creating that distinct, acrid smell you notice. The odor then travels through small openings in ceiling cavities, around light fixtures, and through vents into your living space below.
Other Potential Sources of the Odor
While roof tar is a common source, other water-damaged materials can mimic the smell. Damp wood, especially older lumber or sheathing, can emit a musty, tar-like odor as it begins to decay and rot. Certain types of wet insulation, like some fiberglass batts with asphalt coatings, or old fireproofing materials may also produce similar sharp smells. The consistent factor is that moisture acts as the catalyst, breaking down these materials and releasing odors that are not present when they are completely dry and intact.
Steps to Take When You Smell It
First, check for visible signs of a leak like ceiling stains, bulges, or drips. If it is safe to do so, carefully inspect your attic for dampness, mold, or damaged insulation, watching your step on the joists. Turn off electricity at the circuit breaker to any affected light fixtures or ceiling fans if there is visible moisture present. Then, contact a qualified roofer to find and permanently repair the leak's source, as stopping the ongoing water entry is the critical first step to eliminating the odor for good.
- Look for water stains or sagging on the ceiling.
- Safely check the attic for damp insulation or decking.
- Note any drips or active water entry during rain.
- Turn off power to wet light fixtures or fans.
- Contact a qualified roofer to inspect and repair the roof.
- Place buckets under active leaks to limit floor damage.
Why Professional Water Damage Help Is Needed
After the roof is fixed, hidden water in ceilings, walls, and insulation remains. This lingering moisture can quickly lead to mold growth and structural wood rot if not properly and thoroughly dried. Local water damage pros use specialized tools like penetrating moisture meters and thermal imaging cameras to map all wet areas you cannot see. They then employ industrial dehumidifiers and high-speed air movers in a calculated drying plan to protect your home's structure and your indoor air quality from further damage.
Addressing Odor and Material Removal
Simply drying the area may not remove the persistent tar smell if building materials are deeply saturated. Porous materials like drywall, ceiling tiles, and fiberglass insulation can trap odor molecules within their structure. The pros assess these materials and may need to remove and replace them to fully eliminate the smell at its source. They can also use specialized air scrubbers equipped with activated carbon filters to clean the air of lingering odors. This comprehensive approach ensures the odor and any associated contaminants are completely removed from your home's environment.
Talk to someone now
Call (208) 537-2633 any time, day or night, and describe what happened.
Call Now (208) 537-2633Frequently asked questions
Is a tar smell dangerous to breathe?
The smell itself is an irritant and can cause headaches or nausea. More importantly, it indicates active water damage, which can lead to mold growth. Mold spores can affect indoor air quality and cause respiratory issues. If you feel unwell, see a doctor and address the water source promptly.
Will my homeowner's insurance cover this?
Coverage often depends on the leak's cause. Sudden, accidental damage like a storm-related leak may be covered, while wear and tear typically is not. You must file a claim with your insurer for their review. Policies vary, and your insurer decides what is covered.
How long does the drying process take?
Drying time varies significantly based on the leak's duration, materials affected, and indoor humidity. In Meridian's semi-arid climate, it might proceed faster than in humid regions, but it still requires days. The pros monitor moisture levels daily until materials reach a dry standard, ensuring no hidden wet spots remain.