Thermal insulation is added to walls, roof/ceilings, and floors to slow down the flow of heat into or out of a home. For all types of insulation, the quality of installation is a significant factor in creating an energy-efficient and durable building enclosure and comfortable indoor environment. This TechNote provides practical information for the installation of three types of insulation in various applications. It is intended to help builders and designers meet the requirements of the energy code and maximize the value of each insulation type.