Alternatives in rigid board insulation are available that do not use CFC's. Any rigid expanded polystyrene insulation does not have CFC's. There are no installers of this type of insulation in our region. It is also more costly where available. This type of insulation is considered the most benign from an indoor air quality standpoint.
Perlite insulation is in a loose form suitable to fill the cavities in building block.
Perlite can be bound into other materials and used in sheet form. It is commonly used in commercial roofing material and can be used as an aggregate in concrete. It is non-flammable, lightweight and chemically inert. Not listed in the first Green Building Guide is the use of rockwool insulation. It offers very good energy performance, will not burn, and is chemically inert.