Promat TLFR Board® is mainly used for upgrading the thermal performance of concrete soffits. If, however, you require a thermal performance upgrade of concrete walls, the TLFR Board® could be used, but be aware that the fixings are surface mounted and the joints will be visible because it is not possible to tape and joint the boards. The type of fixings used, and penetration required, should be determined by both the designer and fixing manufacturer.