Glossary

R-value is the rating system to tell you how well insulation can keep heat from leaving or entering a space. The ‘R’ stands for resistance. The higher the R-value the greater the insulating effectiveness.

The amount of water vapor in the air measured as a percentage. The percentage expresses the amount needed for saturation at the same temperature.

Rim joists are attached perpendicular to the joists and provide lateral support for the floor above.