Installation Guide:
Pre-Engineered Steel Applications
Roof Application Method C
Product
 
Average R-Values

• 3.5” Mass insulation System
- Heat flow up: R-17*
- Heat flow down: R-26.5*
• 6” Mass Insulation System
- Heat flow up: R-23*
- Heat flow down: R-32.5*

* Additional R-4.5 added for a still air film
for heat flow down and R-1.3 for heat flow
up.
 

 

Instructions

This application is suitable for 6" Z or C purlins with 3.5" or 6" unfaced mass insulation.

  1. Measure working area where Flexfoil will be applied.
  2. Apply the Flexfoil to the underside of the mass insulation, attaching it to the top face of the purlins.
  3. Ensure that the white polyethylene side of the Flexfoil is facing the mass insulation.
  4. Securely tape any exposed seams using Flexfoil reflective tape.
  5. Apply the steel roof deck using approved methods of installation.