Fiberglass has emerged as a favored choice because of its cost-effectiveness and simple installation process. When used as loose fill, it delivers an R-value ranging from 2.2 to 2.7 per inch, while batts offer an impressive 3.1 to 4.3 per inch. Additionally, its noncombustible properties enhance safety, further solidifying its appeal among homeowners.

Mineral wool, or rock wool, provides an R-value of about 3.0–3.3 per inch. It is highly resistant to fire and does not propagate flames, making it a safer option for insulating areas requiring extra fire protection. It also offers water resistance and soundproofing qualities.

Cellulose insulation, made from recycled paper products, provides an R-value of approximately 3.2–3.8 per inch. This eco-friendly option can be blown into existing walls or attics, offering excellent coverage in hard-to-reach areas. It is treated with fire retardants, enhancing its fire resistance compared to other organic materials.

Closed-cell spray polyurethane foam is arguably the most effective insulation option available today; however, it comes at a premium price. In contrast, fiberglass batts are a budget-friendly alternative that provide decent insulation, assuming they are properly installed. The innovative approach known as flash and batt merges the superior air-sealing capabilities of spray foam with the affordability of fiberglass batts. 

This type provides an R-value of about 3.6–3.8 per inch, offering good insulation while allowing some air movement, which can benefit certain applications.

This type has an R-value ranging from 6.0–7.0 per inch. It delivers higher insulation efficiency and acts as a moisture barrier, making it ideal for areas prone to dampness or where maximum thermal resistance is needed.

By air sealing your home, you'll experience improved air quality, reduced humidity, and greater comfort. Additionally, your home will consume significantly less energy for heating and cooling. Air sealing involves closing up cracks, gaps, joints, and other openings throughout your home. 

Cellulose insulation is an eco-friendly option for attic insulation. It is made of recycled newspaper and cardboard. It has a higher R-value than fiberglass, meaning you can achieve better insulation with a thinner layer. It can be used by itself or laid over existing fiberglass insulation batts in attics.