This part of ISO 12575 specifies the basic performance requirements for the insulating materials that form part of insulating systems used on the exterior of foundations and slabs where the insulation is in direct contact with the ground. This part of ISO 12575 does not address exterior insulating systems for foundations permanently immersed in water.

Minimum requirements are specified in the appropriate national regulations and application specifications.

The designer selects the actual material in accordance with this part of ISO 12575 for the type of system being considered. The designer also consults the appropriate material standard and national regulations for the product selected for added characteristics not specified in this part of ISO 12575.