Reno Roofs: Cheap Shingles Spawning Deadly Lung Mold?

By Franklin Everett Shaw

December 26, 2025

The relentless Nevada sun beats down, baking everything it touches. But it’s not just the heat you need to worry about in Reno; it’s what that heat, combined with the occasional unexpected downpour, can do to your roof – and potentially, your health.

Reno, Nevada, is experiencing a surge in the installation of low-cost asphalt shingles. While seemingly a budget-friendly option upfront, these shingles, particularly in Reno’s high-desert climate, are proving to be a breeding ground for Stachybotrys chartarum, more commonly known as black mold. This isn’t just a cosmetic issue; it’s a serious health hazard that can significantly impact your home’s value and your family’s well-being.

The problem stems from a perfect storm of factors. First, the extreme temperature fluctuations in Reno – scorching summers and freezing winters – cause these cheap shingles to expand and contract rapidly. This leads to cracking and warping, creating entry points for moisture. Second, the infrequent but intense rainstorms that Reno experiences can overwhelm the compromised shingles, allowing water to seep into the underlayment and attic spaces. Third, many Reno homes, especially older ones, lack adequate ventilation in the attic, trapping moisture and creating a humid environment ideal for mold growth.

Asphalt shingles, especially the cheaper varieties, often contain cellulose, which serves as a food source for mold. Once moisture is present, the mold spores, which are ubiquitous in the environment, readily colonize the shingles and spread to other areas of the roof and eventually, the interior of the home.

Identifying a potential mold problem early is crucial. Look for these telltale signs:

• Discoloration on your shingles: Black, green, or brown stains are a red flag. Don’t confuse this with algae, which is more common in humid climates and usually appears as greenish-black streaks. Mold tends to be more blotchy and irregular.
• Musty odors, especially after rain: This is a strong indicator that mold is present, even if you can’t see it. The smell often originates in the attic or crawl spaces.
• Water stains on ceilings or walls: These indicate a leak, which could be feeding mold growth. Check the attic directly above the stain for signs of mold.
• Visible mold growth in the attic: This is the most obvious sign. Look for dark, fuzzy patches on the underside of the roof decking, rafters, or insulation.

If you suspect mold, do not attempt to clean it yourself without proper protective equipment. Disturbing mold can release spores into the air, exacerbating the problem and potentially causing health issues. Instead, hire a qualified mold inspector to conduct a thorough assessment.

Mold testing is essential to confirm the presence of mold and identify the species. A professional inspector will typically take air samples and surface samples. Air samples are used to determine the concentration of mold spores in the air, while surface samples are used to identify the specific types of mold present.

There are two main types of mold testing:

• Air sampling: This involves collecting air samples both inside and outside the home to compare the mold spore counts. Elevated indoor spore counts compared to outdoor counts indicate a potential mold problem.
• Surface sampling: This involves taking samples from visible mold growth or suspected contaminated surfaces using swabs or tape lifts. These samples are then sent to a laboratory for analysis.

Once you have confirmed the presence of Stachybotrys chartarum or other harmful molds, remediation is necessary. This is not a DIY project. Mold remediation requires specialized equipment and techniques to safely remove the mold and prevent its spread.

A professional mold remediation company will typically follow these steps:

1. Containment: The affected area is sealed off to prevent mold spores from spreading to other parts of the house. This often involves using plastic sheeting and negative air pressure.
2. Removal: Mold-infested materials, such as shingles, drywall, and insulation, are carefully removed and disposed of according to local regulations.
3. Cleaning: Surfaces are cleaned with antimicrobial solutions to kill any remaining mold spores.
4. Drying: The affected area is thoroughly dried to prevent future mold growth.
5. Repair: Damaged materials are replaced, and any leaks are repaired to prevent future moisture intrusion.

Choosing the right roofing materials is crucial for preventing future mold problems. In Reno’s climate, consider these mold-resistant options:

• Metal roofing: Metal roofs are highly durable, fire-resistant, and virtually impervious to mold growth. They are more expensive than asphalt shingles but offer a longer lifespan and require less maintenance.
• Tile roofing: Clay or concrete tiles are also resistant to mold and can withstand the harsh Reno climate. They are also aesthetically pleasing and can add value to your home.
• Modified bitumen roofing: This type of roofing is a good option for flat or low-sloped roofs. It is waterproof and resistant to mold growth.

When hiring a roofing contractor, be sure to ask about their experience with mold-resistant materials and their knowledge of local building codes. Check their references and ensure they are properly licensed and insured. Don’t be afraid to ask for proof of insurance and licensing.

If you believe your contractor installed substandard shingles or failed to properly ventilate your attic, leading to mold growth, you may have legal recourse. Consult with an attorney specializing in construction defects to discuss your options. You may be able to recover damages for the cost of mold remediation, roof replacement, and other related expenses.

Document everything. Keep records of all communication with your contractor, including emails, letters, and phone calls. Take photos and videos of the mold growth and any damage to your home. Gather all relevant documents, such as contracts, invoices, and warranties.

Preventing mold growth is always better than dealing with the aftermath. Here are some preventative measures you can take:

• Ensure proper attic ventilation: Make sure your attic has adequate ventilation to prevent moisture buildup. This may involve installing additional vents or a ridge vent.
• Regularly inspect your roof: Check for signs of damage, such as cracked or missing shingles. Repair any leaks promptly.
• Keep gutters clean: Clogged gutters can cause water to back up and seep into your roof. Clean your gutters regularly to ensure proper drainage.
• Consider a mold-resistant underlayment: This will provide an extra layer of protection against moisture intrusion.

Don’t let cheap shingles turn your Reno dream home into a moldy nightmare. By being proactive, informed, and willing to invest in quality materials and professional services, you can protect your home and your health from the dangers of black mold. Remember, a little prevention goes a long way in the high desert.