Tom defines R-value as the resistance of heat transfer through the insulation—meaning, the better the R-value, the less heat is lost. When it comes to R-value and recommendations for your home, a lot depends on where you live. In southern parts of the United States, the recommended R-value for a roof is R-30; for the middle of the country R.. R-value is known as thermal resistance; R stands for Resistance. It is a numerical expression of how good an insulator of certain building material is. You can check types of insulations with typical R-values here for reference. The higher the R-value of a material, the better insulator it is. Example: R-30 material is 3 times better insulator.

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Basement walls: Between R-11 and R-15. Basements are often cold and damp so insulation can combat the potential drop in temperature. However, heat loss is less significant in the lowest level of a house so less insulation is required. Floors: Between R-13 and R-30. This will help retain heat and keep the chill from underfoot.. Installed faced fiberglass batt insulation with its R-value visible (R-21). In the context of construction, the R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive flow of heat. R-value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the.