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