Sag N Bag System

The Sag N Bag System is a double-layer insulation system that uses faced blanket insulation and unfaced insulation to provide superior thermal performance and energy efficiency.

Set-Up And Operation

  • First layer of faced insulation is installed perpendicular to and over the purlins, with the overall extra length to sag down evenly in between the purlins.
  • Top layer is installed parallel to and between the purlins on top of the “sagged” faced insulation.


  • Insulation: between/over purlins, no banding
  • Appearance: purlins exposed
  • Building type: steeper pitches ok
  • Application: new
  • Meets older codes (IECC 2009, ASHRAE 2010)

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