R Value (insulation) – insulation is rated by its R Value, or its resistance value. This is the number that represents how much the product resists heat transference. The higher the r value, the better it resists heat transfer. This means insulation with a high r value is going to keep the summer heat from spreading inside your house through walls and ceilings better than lower numbers, or even a home with no insulation. At the same time, the insulation will keep your heat inside during the winter.
R value is determined by the type of material and how thick it is applied. This number is not guaranteed, as insulation that isn’t installed correctly can lose efficiency. The Department Of Energy (DOE) recommends specific goals for each part of a house and in different regions across the country. Every application is different, but this guide includes recommendations from the DOE to protect your home from energy loss. This is the peak cost-effectiveness of adding insulation in regions 5 and 6. You could add more and more insulation, but the cost of materials would outweigh the benefits.
Uninsulated attics should have, or add to meet R49 to R60. Floors should have, or add to meet R25 to R30. Whenever exterior siding is removed on an uninsulated wall, Add R5 to R6 insulating wall sheathing beneath the new siding. Whenever exterior siding is removed on an insulated wall, Add R5 insulating sheathing before installing the new siding. Department of Energy link: https://www.energy.gov/energysaver/insulation
Too long, didn’t read version: R value measures how effectively your insulation protects your home from extreme heat or cold.
-Marshall Tramp, CPI, RMP
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