If a house has newer siding, what might have been installed prior to the siding's installation?

New thermal insulation is often installed prior to the application of new siding because it enhances the home's energy efficiency. When siding is replaced or installed, it's common for contractors to take the opportunity to add or upgrade insulation to improve the thermal performance of the walls. This ensures the home retains heat during winter and is cooler during the summer, contributing to overall comfort and energy savings.

The installation of thermal insulation also allows for the sealing of any gaps or areas where heat might escape, which is particularly important when improving the building envelope. Other options like a new roof or new windows might not necessarily correlate with the installation of siding, as these elements can be replaced independently based on their condition and lifespan. A new vapor barrier, while beneficial in protecting against moisture, would typically be addressed during the installation of insulation and may not be specifically linked to the siding work.