Can the material be installed parallel to the ridge, in the same direction as the purlins?
In new pre-engineered steel buildings, rFOIL™ is always installed perpendicular to the ridge and purlins. One exception is retrofits, where the material is often attached along the purlins, and secured to the underside. In post/frame buildings, the same applies. For this application, it is possible to install rFOIL™ parallel to the ridge, atop the purlins. The 2’ spacing of purlins in post/frame metal buildings makes it possible to install this way, but only if ALL the roof insulation is being rolled out at the same time. In this case, the rolls are unwound together, ahead of the metal as the roofing is secured to the purlins.
