installed?
BTUFOIL™ can be installed in numerous ways. In pre-engineered steel buildings, BTUFOIL™ 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.BTUFOIL™ usually runs perpendicular to the purlins, and in the same direction as the exterior metal. In retrofit applications, BTUFOIL™ is installed directly to the under side of the purlins, and running perpendicular to the purlins. BTUFOIL™ 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 2½” along this span. In retrofit applications, the air space is provided due to the purlin depth, usually 6″ – 8″.
