Fiberglass Insulation: A Cost-Effective and Reliable Insulation Solution

Fiberglass insulation has been a trusted choice for homeowners and builders for decades. Known for its affordability, fire resistance, and decent thermal performance, it's a go-to insulation material for walls, attics, and crawl spaces. But how does it compare to other insulation types? Let's dive into the details, explore its pros and cons, and determine if it’s the right fit for your home.

What is Fiberglass Insulation?

Fiberglass insulation is made from fine glass fibers that trap air, slowing down heat transfer. It comes in two main forms:

Batt insulation – Pre-cut panels designed for easy installation between wall studs and attic joists.
Blown-in fiberglass insulation – Loose fibers that are blown into wall cavities, attics, or hard-to-reach areas.

This insulation type is widely used due to its affordability and effectiveness in moderate climates.

Comparing Fiberglass Insulation to Other Types

Is fiberglass insulation the best choice for your project? Here’s how it stacks up against spray foam insulation, cellulose insulation, and rockwool insulation.

Insulation Type	R-Value per Inch	Cost	Moisture Resistance	Soundproofing	Durability
Fiberglass Insulation	2.9 – 3.8	Low	Poor	Moderate	10–15 years
Cellulose Insulation	3.2 – 3.8	Low	Poor	Good	10–20 years
Spray Foam Insulation (Closed-Cell)	6.0 – 7.0	High	Excellent	Moderate	20+ years
Rockwool Insulation	4.0 – 4.3	Moderate	Excellent	Excellent	20+ years

✅ Verdict: Fiberglass insulation is a budget-friendly option but falls short in moisture resistance compared to spray foam insulation or rockwool insulation.

Key Benefits of Fiberglass Insulation

1. Cost-Effective

Among all insulation types, fiberglass insulation is one of the most affordable, making it a great choice for large-scale projects.

2. Fire-Resistant

Since fiberglass insulation is made from glass, it’s naturally non-combustible and can slow down fire spread.

3. Moderate Soundproofing

While it’s not as effective as rockwool insulation, fiberglass insulation does reduce noise transmission between rooms.

4. DIY-Friendly

Unlike spray foam insulation, which requires professional application, batt insulation is easy for homeowners to install themselves.

5. Environmentally Friendly Options Available

Some fiberglass insulation products are made from recycled glass, making them an eco-friendly option.

Installation Process for Fiberglass Insulation

The installation process varies based on the type of fiberglass insulation you choose:

Batt Insulation Installation

Measure & Cut – Measure the space between studs or joists and cut the insulation to fit.
Fit & Secure – Place the batt insulation snugly in between framing members.
Seal & Finish – Use vapor barriers if necessary to improve efficiency.

Blown-In Fiberglass Insulation Installation

Prepare the Space – Ensure proper ventilation and clear the area.
Blow the Insulation – Use a specialized machine to distribute the blown-in fiberglass insulation evenly.
Check & Adjust – Make sure insulation depth meets recommended R-value levels.

Cost of Fiberglass Insulation

Area of Home	Estimated Cost for Batt Insulation	Estimated Cost for Blown-In Fiberglass Insulation
Attic	$0.30 – $1.00 per sq. ft.	$0.50 – $1.50 per sq. ft.
Walls	$0.40 – $1.50 per sq. ft.	$0.60 – $2.00 per sq. ft.
Crawl Space	$0.50 – $1.50 per sq. ft.	$0.75 – $2.00 per sq. ft.