Insulating Bottom of Truss - Existing Roof for Post Frame Building and Pole Barn

Insulation Bottom of 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® double bubble insulation to prevent the possibility of freezing in the winter.

  • Nail 1" x 2" furring strips on the bottom of and perpendicular to the trusses on 22" centers. (Note: When truss spacing is 24" it is recommended to install the InfraStop® 24" or 48" product directly to the bottom cord of the truss.)

  • Butt the furring strips tether and tape. Staple tape for reinforcement."

  • Staple the edges of the InfraStop® to the furring strips with the ¾” staple tabs overlapping or square edge butting or overlapping at the seams."

  • Tape the seams with InfraStop® Foil Tape. Goal is an air-tight, snug seam seal.

  • Tape any butt seams with InfraStop® Foil Tape, insure taped seam has a good full continuous bond."

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

Standard Size Rolls for Barns: Square Edge and Staple Tab

Custom Size Rolls for Barns: Square Edge

Thermal Insulation

Open Interior - R-10* Heat Flow Down (and a Radiant Barrier) | R-3.7* 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 - Bottom of Truss, Existing Roof - Post Frame Pole Barn Insulation
  • Post Frame Pole Barn Insulation Main Page

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