When you’re dealing with insulating foam sealants and other insulation supplies, you see this term R-value used a lot. So what does R-value really mean? R-value measures how well insulation resists heat flow. The higher the R-value the better the insulation. For example, if you’re using our Tytan Professional Window and Door Extreme to insulate your house, you want a higher R value to better seal up your home. The higher R-value keeps your home cooler during the summer and warmer during the winter. This will help you with your electricity bill!