The paper deals with the use of waste granular PUR, which currently does not have a wide application in the building practice. Waste granular PUR is formed during the manufacture and moulding of thermal insulation elements made of PUR foam. Good thermal insulation properties can be expected in this waste granular PUR, approaching those of the commonly used thermal insulation today (mineral wool, polystyrene). The paper deals with a thermal insulating mixture of granular PUR with a silicate binder. This newly designed thermal insulation mixture was tested as an alternative integrated thermal insulation in ceramic masonry blocks.