R-Value is a measure of insulation’s ability to resist heat traveling through it. The higher the R-Value the better the thermal performance of the insulation.

The R-value is the building industry term [3] for thermal resistance "per unit area." [4] It is sometimes denoted RSI-value if the SI units are used. [5] An R-value can be given for a material (e.g., for …

To help you choose adequate insulation, we have summarized the R-values of 51 most common insulation materials (check the insulation R-value chart below).

Nov 22, 2024 · What does R-value mean when it comes to insulation? If the temperatures throughout the home seem inconsistent, you feel drafts near the walls, floors, or ceilings, or if the walls and floors...

R-Values An insulating material’s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The …

We have listed down the important information in the form of tables, outlining recommended r-value insulation ranges, insulation thickness, and typical materials to consider for each area, based on …

Jun 3, 2025 · To find the R-value of an insulating material, you’ll need to calculate its heat-resistance per inch of that material. The material’s density. Density is referring to compactness. How compact is the …

Jun 23, 2025 · The “R” in R-value stands for resistance to heat flow. Simply put, the higher the R-value – or the larger the number – the greater a product’s insulating power.

Oct 31, 2025 · R-value—think “R for resistance”—tells you how well insulation slows heat from moving through your walls, attic, or floors. The higher the R-value, the better it resists heat flow and the less …

Learn what R-value means, why it matters for home insulation, and how to calculate the right R-value for your attic, walls, or basement using our free online R-Value Calculator.