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R-value is the most important number in insulation. Here's what it means and why it matters for your home.
R-value measures a material's resistance to heat flow. The higher the R-value, the better that material is at slowing down heat moving through it — which means less heat escaping in winter and less entering in summer. It's the standard way to compare insulation performance, regardless of brand or material type.
R-value assumes insulation is installed correctly and at full thickness. Gaps, compression, or moisture can all reduce real-world performance below the labeled number.
The right R-value for your attic or walls depends on where you live. Colder climates generally call for higher R-values than milder ones.
Insulation can settle, compress, or absorb moisture over time, lowering its real-world R-value even if it looks fine from a distance.
The U.S. Department of Energy generally recommends attic insulation levels in the R38–R60 range for most homes, though the right number for your home depends on your climate zone and current insulation levels. A free assessment from our team is the most reliable way to know your home's actual number.
Call now for a free assessment — we'll tell you exactly where your home stands.
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