Insulating with Furring Under Trusses - New Roof for Steel and Metal Buildings

Insulation Under Truss - Existing Metal Roof Application

Installation Instructions

  • Pre-installation inspection - Check the roof area for clutter, water sprinklers, conduit and lights. Sprinkler systems are especially important. All water pipes must be below the InfraStop® to prevent the possibility of freezing in the winter. In many instances the InfraStop® product must be installed up near the roof deck.

  • Install 1”x 2” furring strips on the bottom of and perpendicular to the Z purlins on 22” centers. Utilize 1 1/4” self-taping sheet metal screws to secure the furring strips to the Z purlins.

  • Butt the furring strips together and tape. Staple tape for reinforcement.

  • Staple the edges of the InfraStop® Reflective/Bubble/Bubble/Reflective product to the furring strips with the 3/4” tabs (so that they will overlap at the seam).

  • Tape the seams with a InfraStop® Foil Tape (goal is an air-tight, snug seam seal).

  • Staple product at approximately 4” intervals down the middle of the sheet into the furring strip above.

Standard Size for Metal Buildings: Square Edge and Staple Tab

Custom Size Rolls for Metal Buildings: Square Edge

Thermal Insulation

Open Interior - R-11* Heat Flow Down (and a Radiant Barrier) | R-4.4* Heat Flow Up

Please Note: In addition to the stated R-value, this application also provides a Radiant Barrier. As a result, a 94% + reduction of the radiant energy that ordinarily would be transmitted to the interior of the building is blocked.

*Includes thermal resistance of 1.32 UP and 4.55 DOWN for interior air film.

Product Information

InfraStop® Insulation products are a group of technologically advanced materials. They are ideal for new construction or retrofit applications in commercial, industrial, metal and post/frame buildings, along with many other DIY applications. When you think of insulation, you should think of InfraStop®. Our products are recognized for their thermal performance, easy installation, versatility, price and environmental friendliness.


  • Easy to handle and install
  • Convenient roll sizes
  • Class A / Class 1 Fire Rating
  • Inhibits dew point condensation
  • Vapor retarder (0.02 perms)
  • Does not compress, collapse or disintegrate
  • Non-toxic / non-carcinogenic

Testing and Certification

InfraStop® products are thoroughly tested at either nationally approved independent laboratories or leading universities. Tests are performed to current American Society of Testing and Materials (ASTM) standards when a standard exists. For a copy of an actual test report, please e-mail us at

  • White One Side Metal and Steel Building Insulation Category
  • Metal and Steel Building Page

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