Yes, you can use R19 insulation in an attic, but it may not be the most optimal choice depending on your climate and insulation needs. The appropriate insulation level for an attic depends on various factors, including your region's climate, the desired level of energy efficiency, and the type of heating and cooling systems in your home.
R19 insulation typically refers to fiberglass or mineral wool insulation with a thermal resistance (R-value) of approximately 19. The R-value indicates the insulation's ability to resist heat transfer, and a higher R-value provides better insulation.
In colder climates, it is generally recommended to have a higher R-value in the attic to prevent heat loss during the winter. In such regions, R30 to R60 insulation levels are often recommended. On the other hand, in warmer climates, the main concern may be preventing heat gain, and a lower R-value could be sufficient.
Before adding insulation to your attic, it's essential to consider local building codes and recommendations from energy-efficient programs in your area. Additionally, conducting an energy audit or consulting with a professional insulation contractor can help determine the best insulation level for your specific situation.
Keep in mind that adding insulation alone may not address all energy efficiency issues in your home. Proper air sealing, ventilation, and addressing any thermal bridging are also important aspects to consider for a well-insulated and energy-efficient attic.