However each material has its own specialty.
Rigid foam on attic walls behind celotex.
This article gives the history and properties of celotex thermax and other foam board insulating products.
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This video shows an example of a home that has rigid foam installed on it but not quite the way we would recommend.
Celotex dow polyisocyanurate insulating foam board foam board properties history asbestos facings.
For example rigid foam is mostly used for basement wall insulation due to its ability to resist moisture.
Attach the tongue and groove insulation boards to the concrete wall with adhesive.
Use a premade kit for this type of project.
For a basement remodeling project consider insulating basement walls with foam board.
Basically both materials are used for residential.
Celotex foam board insulation was later purchased by dow chemical who continues to market polyisocyanurate foam insulating board.
This agrément certificate product sheet 1 relates to celotex pir plasterboard thermal laminates comprising rigid polyisocyanurate pir foam boards bonded to plasterboard for use as insulating dry lining for internal wall applications in existing domestic and non domestic buildings.
On the other hand there is the rigid foam as its competitor.