When it comes to improving energy efficiency and comfort in homes throughout St. Petersburg, Florida, blown-in fiberglass insulation stands out as one of the most effective and versatile options. This insulation method offers a combination of thermal performance, affordability, and ease of application that aligns well with the climate and housing structures in this region.

Blown-in fiberglass insulation is ideal for retrofitting attics, walls, and hard-to-reach cavities. It delivers consistent coverage, reducing gaps and thermal bridging that can lead to energy loss. For Florida homeowners looking to upgrade their insulation, this solution offers a solid balance between performance and cost.

This article explores the key benefits, installation factors, and regional considerations of blown-in fiberglass insulation to help you determine if it’s the right fit for your home.

Understanding Blown-In Fiberglass Insulation

Blown-in fiberglass insulation consists of fine glass fibers blown into place using specialized machinery. It creates a seamless blanket of insulation, particularly effective in attics and wall cavities.

Benefits at a Glance

• Even Coverage: Fills irregular spaces and gaps missed by batts
• Non-Combustible: Provides added fire safety
• Moisture Resistant: Does not absorb water, reducing mold risk
• Non-Settling: Maintains insulating value over time

Technical Performance Comparison

Feature	Blown-In Fiberglass	Batt Fiberglass	Cellulose Insulation
R-Value (per inch)	R-2.2 to R-2.9	R-2.9 to R-3.8	R-3.2 to R-3.8
Fire Resistance	Excellent	Excellent	Moderate
Settling Over Time	Minimal	N/A	Moderate
Air Leakage Control	Good	Poor	Good
Moisture Resistance	High	Moderate	Low
Pest Resistance	Good	Good	Treated for insects
Typical Applications	Attics, walls	Walls, floors	Attics, walls

Why It’s Ideal for St. Petersburg Homes

Managing Heat and Humidity

St. Petersburg’s subtropical climate brings year-round humidity and high summer temperatures. Blown-in fiberglass helps maintain consistent indoor temperatures by reducing attic heat gain, which directly affects cooling loads.

Moisture Considerations

The insulation’s inorganic composition resists mold growth, even in moist conditions. This is a significant advantage in Florida, where humidity can create challenges for other types of insulation.

Energy Efficiency Impact

According to the U.S. Department of Energy, upgrading insulation in attics and walls can cut heating and cooling costs by 15% or more. Blown-in fiberglass offers substantial long-term savings when installed properly.

Bonus Tip: Seal air leaks before installation to maximize the insulation’s effectiveness.

Installation Considerations

Application Method

Blown-in fiberglass requires a blowing machine and is typically installed by professionals. It can be applied over existing insulation layers if they are in good condition.

Time and Labor

Most attic installations can be completed in less than a day, making it a minimally disruptive upgrade.

Health and Safety

Modern fiberglass insulation is manufactured to reduce airborne particles and irritation. Installers use PPE, but once installed, the insulation is safe and inert.

Bonus Tip: Inquire about insulation depth markers to ensure the correct R-value is reached.

Things to Consider Before Choosing Insulation

1. Local Building Codes and Rebates

Florida building codes require specific insulation values. Check local mandates and take advantage of available incentives or utility rebates.

2. Home Age and Construction Type

Older homes may require air sealing and minor retrofits before blown-in insulation can be added effectively.

3. HVAC System Compatibility

Ensure your HVAC system is properly sized for the new insulation levels to avoid overcooling or short cycling.

Common Homeowner Questions

How long does blown-in fiberglass insulation last?

Properly installed, it can last 20–30 years with minimal maintenance.

Can it be installed over old insulation?

Yes, provided the existing insulation is dry, uncontaminated, and evenly distributed.

Does it require a vapor barrier?

In Florida’s climate, vapor barriers are usually not recommended. The insulation’s breathability helps manage moisture.

Will it improve indoor air quality?

By reducing drafts and sealing gaps, it can indirectly contribute to better air quality and comfort.

Is it environmentally friendly?

Many brands use recycled glass content and are formaldehyde-free.

Finding the Right Insulation Expertise

Blown-in fiberglass insulation offers a practical and cost-effective way to improve energy efficiency, comfort, and air quality in St. Petersburg homes. It’s especially effective in humid, warm climates where proper attic insulation plays a vital role in home performance.

For homeowners seeking professional guidance or services, On the Mark Spray Foam Insulation is a provider with experience in this field.

Readers can learn more about On the Mark Spray Foam Insulation’s services:

Company: On the Mark Spray Foam Insulation
Phone: (813) 921-0444
Email: tommybaldwin901@gmail.com
Learn more about blown-in insulation options in Florida