Purlins or Flush Frame Application Roof

Product Foil Double Bubble Foil   R-Value Heat Flow Up: R-4.3* Heat Flow Down: R-9.8* * System R-Values are for one enclosed airspace. Additional R-4.5 added for a still air film for heat flow down and R-1.3 for heat flow up.   Instructions Tack fasten the Flexfoil to the purlins. Ensure that enough material is draped between the purlins to allow the Flexfoil to sag approximately 3/4", thereby creating an airspace between the roof decking and the material After the first 4ft of Flexfoil is fastened, attach the roof sheeting over that area. Ensure that all of the adjoining seams are taped using Flexfoil reflective tape. Repeat the above steps for the next section of the roof. Ensure that the ridge vent is left exposed (if applicable). The ventilation design should not be tampered with when installing any insulation.