What Is An R-Value?

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Understanding The R-Value Of Insulation

R-Value is the benchmark for thermal insulation effectiveness. The higher the R-Value, the better the insulation resists heat transfer, keeping your space comfortable year-round. The “R” in R-Value stands for Thermal Resistance. It is a standardized measure that allows builders, architects, and homeowners to compare the insulating capabilities of different materials. A higher R-Value indicates better insulation performance, implying that the material is more effective at resisting the flow of heat.

How Is R-Value Calculated?

R = Thickness in inches / Thermal Conductivity in BTU

In simpler terms, R-Value is like a score that shows how good a material is at stopping heat. Imagine it as a ratio between the material’s thickness and how well it stops heat. The higher the score, the better the material keeps heat in or out. So, when you see R-Value, it’s a handy way to compare how different materials work to keep your home comfortable by managing heat.

What Is The R-Value Of Spray Foam?

The R-value of spray foam insulation can vary depending on the type and formulation of the spray foam. Closed-cell spray foam generally has a higher R-value compared to open-cell spray foam.

Closed-Cell Spray Foam: Typically has an R-value that ranges from about 6.0 to 7.0 per inch.

Open-Cell Spray Foam: Generally has a slightly lower R-value, typically ranging from 3.5 to 4.5 per inch.

Unlike traditional options, spray foam creates an airtight seal, eliminating gaps and ensuring optimal R-Value. This cutting-edge solution outperforms fiberglass and cellulose, providing superior energy efficiency and long-term savings.

Does Spray Foam Have A Higher R-Value Than Fiberglass?

In general, spray foam has a much higher R-Value than fiberglass insulation:

Fiberglass Batts and Rolls: Typically have R-values ranging from about 2.9 to 3.8 per inch.

Loose-Fill (Blown-In) Fiberglass: Typically has R-values ranging from about 2.2 to 2.7 per inch.

Spray Foam Vs Fiberglass

Spray foam conquers gaps and crevices for an unbeatable seal.
Fiberglass struggles with air leakage, compromising efficiency.

Comparing Insulation Materials

Spray Foam Fiberglass Cellulose
R-Value ranging of 3.5 - 7 per inch
R-Values ranging from 2.2 - 3.8 per inch
Approximately R-3.5 per inch
Provides excellent air sealing due to its ability to expand and fill gaps, minimizing air infiltration.
While it may not provide the same level of air sealing as spray foam, it is more cost effective initially
While not as effective at air sealing as spray foam, cellulose insulation can still result in energy savings by reducing heat transfer
Water resistant
May absorb water over time
May absorb water over time
Spray foam insulation can have a lifespan of 80 - 100 years.
Can have a lifespan of 15 - 30 years
Can have a lifespan of 20 - 30 years
Closed-cell spray foam is inherently fire-resistant due to its dense structure. It can act as a barrier to flames and heat
Fiberglass is naturally non-combustible. However, it's important to note that while the fibers themselves do not burn, other components in fiberglass products (such as facing materials) may be combustible
Cellulose insulation is generally treated with fire-retardant chemicals to enhance its resistance to fire.