Technical Bulletin #303 contains important information about the use of Polyiso CI (with foil or coated glass facer) when used as a continuous layer of insulation on the exterior of a home (wood or steel framed construction). This technical bulletin notes that providing insulation over the entire opaque wall surface significantly increases the overall thermal performance and energy efficiency of a home and highlights how it protects from the ravages of moisture.
Included in this technical bulletin are a number of illustrations comparing Polyiso CI with other systems in connection with the transfer of moisture. A “Key Facts” summary provides a convenient reference of the important information contained in this document.
A link to PIMA Technical Bulletin #303 is provided here