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How thick a PL4000 Celotex board should I use on my external wall? It can get very cold in winter.
The Celotex PL4000 is a very good insulated thermal laminate. When deciding on the thickness to use, the desired result has to be considered. While the thicker the board the better performance can be expected, this needs to be balanced with the space this will take within the room and around openings such as windows/doors.
