Mold growth in homes is all too common in Los Angeles County, where conditions can create ideal conditions for mold. Here at Scope Environmental, our mold remediation in Pasadena and the rest of Los Angeles County can test, remove, and ultimately remediate our client’s mold. By understanding the root causes of mold, you can take steps to reduce the risk of mold growth.
What is mold, and why does it grow indoors?
Mold is a type of fungus that thrives in moist environments. It reproduces through tiny spores that float in the air and can settle on surfaces where moisture is present. When these spores find a damp spot, they begin to grow and multiply, leading to visible mold colonies. Indoors, mold can grow on various materials, including drywall, wood, carpet, insulation, and even dust.
What are the primary causes of mold growth in homes?
The most significant factor contributing to mold growth is excess moisture. Without moisture, mold cannot grow, even if spores are present. Several conditions can lead to moisture buildup in a home, including:
High Humidity Levels
Areas with high humidity, such as bathrooms, kitchens, and basements, are particularly prone to mold growth. In Southern California, coastal regions often experience higher humidity, which can contribute to indoor moisture problems. Homes without proper ventilation can trap humid air inside, allowing mold to flourish.
Water Leaks and Intrusion
Leaking pipes, roof leaks, and faulty plumbing are common sources of water intrusion that lead to mold. Even small, slow leaks behind walls or under sinks can create enough moisture for mold to develop. Flooding, whether from heavy rains, appliance malfunctions, or sewer backups, also creates immediate mold risks if not properly dried and treated.
Poor Ventilation
Inadequate airflow allows moisture to accumulate, especially in areas where water is frequently used, such as showers and laundry rooms. Without proper ventilation, steam from hot showers or cooking can settle on walls and ceilings, creating damp surfaces where mold can grow.
Condensation
Condensation forms when warm, moist air comes into contact with cooler surfaces, such as windows, pipes, or exterior walls. Over time, this condensation can lead to mold growth, particularly in poorly insulated homes. Metal pipes, concrete floors, and single-pane windows are common condensation hotspots.
Damp Building Materials
Construction materials like drywall, wood, and carpeting can retain moisture if exposed to water. If these materials are not thoroughly dried after a leak or flood, mold can begin growing within 24 to 48 hours.
Where can mold grow where you might not be able to see it
Mold often grows in places that are not immediately visible, making it a persistent issue in many homes. Some hidden locations include:
Behind Walls and Under Flooring
Water leaks from plumbing or roof damage can seep into wall cavities and subflooring, creating an unseen breeding ground for mold. Musty odors or warped walls may indicate hidden mold growth.
HVAC Systems
Heating, ventilation, and air conditioning systems can circulate mold spores if moisture accumulates in ducts or drip pans. Dirty filters and neglected maintenance can worsen the problem.
Crawl Spaces and Attics
Poorly ventilated crawl spaces and attics can trap moisture, especially if there are roof leaks or inadequate vapor barriers. Mold in these areas can spread to other parts of the home.
How does climate affect mold growth in Southern California?
Southern California’s climate varies from coastal humidity to inland dryness, but certain conditions increase mold risks:
Coastal Humidity
Homes near the ocean often deal with higher humidity levels, especially during summer months. Without dehumidifiers or proper ventilation, this moisture can lead to mold.
Rain and Seasonal Changes
While Southern California is generally dry, heavy rains during winter or rare storms can cause leaks and flooding. Homes with poor drainage or aging roofs are particularly vulnerable.
Temperature Fluctuations
Cool nights followed by warm days can lead to condensation, especially in older homes with insufficient insulation.
Can household activities contribute to mold growth?
Yes, everyday activities can increase indoor moisture levels if not managed properly:
Showering Without Ventilation
Hot showers produce steam that can linger on walls and ceilings. Using exhaust fans or opening windows helps reduce moisture buildup.
Drying Clothes Indoors
Hanging wet laundry inside can release moisture into the air. If possible, dry clothes outside or use a vented dryer.
Overwatering Indoor Plants
Excess water in plant trays or pots can create localized humidity, encouraging mold growth in soil and nearby surfaces.
How can building materials and home design influence mold growth?
Certain construction choices can make homes more susceptible to mold:
Non-Porous vs. Porous Materials
Porous materials like drywall, carpet, and untreated wood absorb and retain moisture, making them ideal for mold growth. Non-porous materials like tile, glass, and metal resist mold but can still harbor it in grout or dust layers.
Poor Insulation
Inadequate insulation can lead to condensation on walls and windows, especially in temperature-controlled homes where indoor and outdoor temperatures differ significantly.
Flat Roofs and Poor Drainage
Some Southern California homes have flat roofs, which can pool water if not properly maintained. Similarly, clogged gutters and improper yard grading can direct water toward the foundation, increasing moisture levels inside.
Does mold only grow in old homes?
No, mold can grow in both old and new homes. While older homes may have more wear and tear (such as leaky pipes or outdated roofing), newer homes can also develop mold problems if construction defects, such as improper sealing or insufficient drying of building materials, are present. Even newly built homes can experience mold if ventilation is inadequate or if water damage occurs during construction.
How can I tell if my home has a mold problem?
Signs of mold growth include:
Mold in Sight
Discolored patches on walls, ceilings, or floors (often green, black, or white).
Musty Odors
A persistent earthy or damp smell, especially in enclosed spaces like basements or closets.
Health Symptoms
Allergic reactions, respiratory issues, or unexplained illnesses that improve when away from home.
Water Stains or Warping
Discoloration or bulging in walls, floors, or ceilings may indicate past or ongoing moisture issues.
How can I prevent mold growth in my home?
Preventing mold involves controlling moisture:
Fix Leaks Immediately
Repair plumbing, roof leaks, and faulty appliances as soon as they are detected.
Improve Ventilation
Use exhaust fans in bathrooms and kitchens, and ensure your HVAC system is well-maintained.
Use Dehumidifiers
In humid climates or damp areas like basements, dehumidifiers can help maintain optimal moisture levels.
Clean and Dry Water-Damaged Areas
After spills or flooding, dry affected areas within 24-48 hours to prevent mold growth.
When Is a Mold Problem Serious Enough to Contact Scope Environmental?
Mold growth in homes can range from a minor nuisance to a severe health and structural hazard. Knowing when to handle it yourself and when to call a professional mold remediation company like Scope Environmental is crucial. Below, we outline key factors that determine whether your mold issue requires professional intervention.
How much mold is considered a serious problem?
The severity of a mold problem depends on several factors, including the size of the affected area, the type of mold, and whether occupants are experiencing health issues. Here are some general guidelines:
Small, Isolated Areas (Less Than 10 Square Feet)
If the mold is confined to a small patch (e.g., on a bathroom ceiling or around a window), you may be able to clean it yourself using proper safety precautions (gloves, masks, and proper cleaning solutions). However, if the mold keeps returning after cleaning, there’s likely an underlying moisture issue that needs professional attention.
Moderate to Large Infestations (More Than 10 Square Feet)
Extensive mold growth—such as covering entire walls, ceilings, or multiple rooms—should always be handled by professionals. Large-scale mold removal requires specialized equipment, containment barriers, and proper disposal methods to prevent cross-contamination.
Hidden Mold (Behind Walls, Under Floors, or in HVAC Systems)
If you smell mold but can’t see it, or if you’ve had water damage (like a leaky pipe or flooding) that wasn’t properly dried, mold may be growing out of sight. Professionals use moisture meters, infrared cameras, and air sampling to detect hidden mold and assess the full extent of the problem.
What types of mold are most dangerous?
While all mold should be taken seriously, some species pose greater health risks:
Stachybotrys chartarum (Black Mold)
Often referred to as “toxic black mold,” this species produces mycotoxins that can cause severe respiratory issues, neurological symptoms, and immune system suppression. If you suspect black mold, do not disturb it—contact professionals immediately.
Aspergillus
Common in homes, some strains of Aspergillus can cause allergic reactions and lung infections, especially in immunocompromised individuals.
Penicillium
Frequently found on water-damaged materials, certain Penicillium species can trigger asthma and allergies.
If you’re unsure about the type of mold in your home, a professional inspection and lab testing can provide clarity.
When should I call Scope Environmental for health-related concerns?
Mold exposure affects people differently, but certain symptoms indicate a serious problem:
Persistent Allergic Reactions
Sneezing, coughing, itchy eyes, and skin rashes that worsen at home but improve when you leave may signal mold sensitivity.
Respiratory Issues
Wheezing, shortness of breath, or asthma attacks in mold-prone environments require immediate attention.
Chronic Headaches or Fatigue
Long-term exposure to mycotoxins (from molds like Stachybotrys) can lead to neurological symptoms, including memory problems and dizziness.
If household members—especially infants, elderly individuals, or those with asthma or weakened immune systems—are experiencing these symptoms, professional mold remediation is strongly recommended.
What structural issues make mold a serious problem?
Mold doesn’t just affect health; it can also damage your home’s integrity:
Wood Rot
Mold feeds on organic materials like wood, weakening floor joists, wall studs, and subflooring over time. If you notice soft, warped, or discolored wood, the mold may have caused structural damage.
Drywall and Insulation Damage
Mold can ruin drywall and insulation, requiring full replacement. If walls are bulging, crumbling, or have widespread staining, professional remediation is necessary before repairs.
HVAC Contamination
If mold is growing in air ducts or vents, it can spread spores throughout your home every time the system runs. HVAC mold requires specialized cleaning to prevent recurring exposure.
When is DIY mold cleanup unsafe?
Attempting to remove mold yourself can sometimes worsen the problem. Avoid DIY and call Scope Environmental if:
The Mold is in Hard-to-Reach Areas
Attics, crawl spaces, and inside walls require professional tools and protective gear.
You Suspect Toxic Mold
Disturbing black mold without proper containment can release harmful spores into the air.
There’s Extensive Water Damage
If the mold resulted from flooding or major leaks, hidden moisture may remain, leading to regrowth.
You’re Experiencing Health Symptoms
If cleaning mold triggers allergies or breathing problems, stop immediately and call professionals.
How does Scope Environmental handle serious mold problems?
Our process can include safe, thorough mold removal, but it can also include:
Inspection and Testing
We identify moisture sources, assess mold spread (including hidden growth), and determine the best remediation plan.
Containment and Air Filtration
We use physical barriers and HEPA air scrubbers to prevent spores from spreading during removal.
Safe Removal and Disposal
Affected materials are carefully removed and discarded following industry and regulatory guidelines.
Moisture Control and Prevention
We fix the root cause (e.g., leaks, poor ventilation) to prevent future mold growth.
Final Verification
Post-remediation testing ensures your home is mold-free and safe.
Don’t Wait Until It’s Too Late
If your mold problem meets any of the criteria above, contact Scope Environmental for expert remediation in Southern California. Early intervention protects your health, home, and peace of mind.
Scope Environmental helps businesses and homeowners by providing comprehensive mold inspections using advanced tools like thermal imaging and moisture meters to identify hidden problem areas in large commercial spaces.
Our remediation services include safe containment protocols to prevent cross-contamination during mold removal, which is especially important in businesses that must remain operational during cleanup.
We work with property managers to develop customized prevention plans, including HVAC maintenance schedules and moisture control strategies tailored to the building’s specific needs.
Emergency response services are available for businesses dealing with sudden water damage, ensuring rapid drying and disinfection to stop mold before it starts.
Post-remediation services verify that the property is safe for employees and customers, providing documentation for compliance with health regulations.
Professional Mold Remediation in Pasadena and Much More
While small mold patches can sometimes be cleaned with household solutions, larger infestations require professional remediation. Disturbing mold without proper containment can spread spores, worsening the problem. At Scope Environmental, we use specialized equipment to detect, contain, and safely remove mold while addressing the underlying moisture issue to prevent recurrence.