Thinking About BIBS? Here's How It Compares to Traditional Insulation

Blown-in Blanket Systems (BIBS) have gained attention as an alternative to traditional insulation in residential and commercial properties. Whether the focus is thermal performance, air sealing, or installation method, property owners are asking how BIBS stacks up against long-standing insulation types like fiberglass batts, spray foam, and cellulose.

This article compares Blown-in Blanket Insulation System and traditional insulation options across several categories, including materials, performance, installation, and long-term maintenance. It provides practical insights for property owners evaluating which system best supports energy goals, indoor comfort, and air quality.

What Is BIBS and How Does It Work?

The Blown-in Blanket System (BIBS) uses loose-fill fiberglass insulation blown behind a mesh fabric installed over open wall cavities. Unlike batts or boards, BIBS fills irregular spaces evenly and without compression.

How the BIBS Process Works

• A fabric mesh is stapled across open wall framing.

• Loose-fill fiberglass is blown into each cavity under pressure.

• The material expands behind the mesh, fully filling the cavity without gaps.

Why BIBS Is Used in New Construction and Retrofits

BIBS is commonly used in:

• New builds requiring high thermal performance

• Renovations where traditional batts won’t fit uniformly

• Sound-sensitive areas like offices or media rooms

This method creates a dense, consistent fill that helps prevent cold spots and improves sound control.

Key Differences Between BIBS and Traditional Insulation

Choosing the right insulation depends on thermal goals, installation conditions, and wall structure. Here's a side-by-side look at the most relevant distinctions.

How BIBS Performs in Real-World Conditions

When installed properly, BIBS delivers measurable benefits across thermal, acoustic, and environmental categories.

Thermal Performance and Energy Use

BIBS has a higher density than standard fiberglass batts, improving R-value consistency across cavities. It minimizes air movement within the insulation layer, which helps maintain interior temperatures and reduce HVAC workload.

Air Infiltration and Draft Control

Unlike batt insulation, which may leave small gaps around wiring and pipes, BIBS conforms to irregular shapes and corners. This fit reduces unwanted air leakage. For full air sealing, it may be paired with other materials like caulks or vapor barriers.

Moisture and Mold Resistance

The fiberglass used in BIBS is not a food source for mold. It resists moisture absorption better than cellulose, though not as aggressively as closed-cell spray foam. Proper installation and vapor control layers reduce any risk of condensation.

Installation Considerations and Project Conditions

Each insulation system has practical limitations depending on access, wall type, and project schedule.

When BIBS Is a Better Fit

• Wall cavities with obstructions (pipes, wiring)

• Projects needing higher R-values without foam

• Builders preferring non-chemical materials

When Traditional Insulation Works Better

• Open attic floors or large, unfinished basements

• High-moisture areas better suited to closed-cell foam

• Low-budget jobs where cost per square foot is a concern

Installation Time and Disruption

BIBS requires specialized equipment and trained installers. Setup takes more time than unrolling fiberglass batts but is faster than multi-step spray foam applications. For retrofit jobs, BIBS may involve temporary removal of drywall or exterior sheathing.

BIBS and Long-Term Maintenance

Settling and Performance Over Time

Properly installed BIBS maintains its shape and fill level. Early issues with settling were mostly due to incorrect installation or poor fill rates. Dense packing and stable mesh prevent most modern BIBS systems from compressing.

Repair and Accessibility

If future wall access is required (for wiring or plumbing), BIBS may need partial removal. The blown-in material can be vacuumed out and reapplied. Fiberglass batts are easier to remove and reuse, while spray foam must be cut out entirely.

Common Question: Is BIBS More Cost Effective Over Time?

Although the upfront cost of BIBS installation is often higher than fiberglass batts or cellulose, its longer-term energy savings and thermal stability may offset the difference over time. Reduced air infiltration and better fill rates contribute to more stable indoor temperatures, lowering heating and cooling demand.

In commercial buildings, the improved sound performance and consistent R-values can offer operational savings and contribute to LEED or energy certification goals. Residential users often cite improved comfort levels as a long-term advantage.

Conclusion

BIBS offers a practical insulation option for both residential and commercial buildings where complete wall coverage and stable performance are priorities. It stands out for its dense packing, air reduction capabilities, and flexibility in irregular framing spaces.

For owners seeking a balance between performance, longevity, and environmental impact, BIBS provides a strong alternative to traditional batt and cellulose methods. It’s not the lowest-cost system upfront, but in projects where energy efficiency and sound insulation matter, it can deliver long-term value. Whether planning new construction or upgrading an existing structure, consulting a professional insulation contractor ensures you understand how BIBS compares and supports informed choices.

FAQs

Is BIBS insulation safe for indoor air quality? 

Yes. BIBS uses formaldehyde-free fiberglass, which is inert and does not support mold growth. The materials do not emit VOCs and are often GREENGUARD certified.

Can BIBS be used in ceilings or floors? 

BIBS is commonly used in vertical wall cavities, but it can also be applied in sloped ceilings or between floor joists if mesh containment is possible.

How long does BIBS insulation last? 

When installed correctly, BIBS retains its thermal performance for the life of the structure. It does not break down, rot, or attract pests.

Does BIBS reduce noise better than other types? 

Yes. Due to its density and complete cavity fill, BIBS provides better sound dampening than batts and performs comparably to cellulose and spray foam.

Is BIBS insulation considered eco-friendly? 

It is made from recycled glass and can be reused or recycled at the end of life. It contains no chemicals or adhesives and meets common environmental building standards.

Author: With 15 years of banking experience and five years managing H&R Foam Insulation, Edith is passionate about building strong relationships with customers. Her favorite part of the role is connecting with clients and ensuring their needs are met as she works alongside them to improve the health, comfort, and energy efficiency of their homes.

Reviewer: With 7 years in the spray foam insulation business, Ella Adams offered useful feedback on this post, helping make sure the tips were both realistic and easy to apply.