Aluminum foil facing is uesd as vapor barrier and radiant heat refector to improve the performance of thermal insulation. It is suitable for on-line laminating with insulation such as glass wool, rock wool and mineral wool etc. by heating, no need applying extra adhesive. It is more enviroment friendly than use adhesive to stick FSK facing on glass wool and rock wool. And it is sticked very well with glass wool at every point. It is an insulation facing to block radiant heat coming into house through the roof and wall during summer and retain indoor heat generated during winter.