Depending on the application rFOIL can be installed in numerous ways. In pre-engineered steel buildings, rFOIL is installed either above or below the purlins supporting the metal roof and sidewalls. In new construction, it’s most often installed on the outside of the purlins. rFOIL usually runs perpendicular to the purlins, and in the same direction as the exterior metal. In retrofit applications, it is easiest to install rFOIL directly to the inside of the purlins, and running parallel. rFOIL requires an airspace, ideally at least ¾”, to effectively redirect heat transfer. This is easily accomplished when installing over purlins spaced 5’ apart, since the products own weight creates a natural drape of 2 ½” along this span.
UNDER CONCRETE: When installing Ultra CBF or Concrete Underpad, it is important that the clear poly side face upward, to provide a thermal break so radiant heat can be reflected back. An adverse chemical reaction could occur between the lime contained in concrete and the aluminum should the lime come in contact with the aluminum, which would then delaminate. All rFOIL under concrete products have a poly coating protecting the foil surfaces.