What is a prescriptive packages approach?
A prescriptive packages approach lists the minimum R-value or maximum U-factor requirements for each building component such as windows, walls, and roofs. This approach is quick and easy to use, but many users find it somewhat restrictive because the requirements typically are based on worst-case assumptions and all requirements must be met exactly as specified. By locating the correct climate zone and looking up the appropriate table of packages, you can verify that your project meets one of the packages listed for that climate zone. You can use the laminated plastic Prescriptive packages distributed at training sessions from the TX State Energy Conservation Office (TX SECO), or: See the REScheck Prescriptive Package Generator for the web-based version of this approach bldgcode.pnl.gov/REScheckPkgGen/PkgGen.html. See the REScheck (formerly MECcheck) prescriptive packages for the paper-based version of this approach. The Prescriptive Package Field Guides are another quick reference for
