If you are wanting to create a thermal br.
Rigid foam on attic walls behind celotex.
For a basement remodeling project consider insulating basement walls with foam board.
Use a premade kit for this type of project.
Basically both materials are used for residential.
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For new construction use rigid boards to insulate slabs and the outside of foundation walls.
Celotex dow polyisocyanurate insulating foam board foam board properties history asbestos facings.
This article gives the history and properties of celotex thermax and other foam board insulating products.
Attach the tongue and groove insulation boards to the concrete wall with adhesive.
This video shows an example of a home that has rigid foam installed on it but not quite the way we would recommend.
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.
However each material has its own specialty.
On the other hand there is the rigid foam as its competitor.