Insulation for Radiant Heat in Floor Joist

Insulation In Floor Joists Under Radiant Heat

Installation Instructions

Installation Instructions: (There are 5 methods with varying levels of benefit)

Note: For all methods, inspect the structural integrity of the sub-floor and make any needed repairs before installing InfraStop®.

1. Product (Double Layer) Installed to Underside and Inside of Floor Joist - R-21 and a Radiant Reflector

  • Begin at one end of the house. Insert the first course of InfraStop® half way up into the joist cavity and staple (at approximately 3” to 4” intervals) the edge of the product to the side of the joist. The goal is to split the joist cavity into two approximately equal enclosed air spaces.

  • Continue with the second course of product at one end of a joist cavity (after the first course has been installed) and secure the product “end” with staples to the sub-floor or band board. Proceed down the joists by stapling each edge (or middle of the InfraStop® double bubble 48” wide product) to the face of each joist. Staple the product at intervals of approximately 3” to 4”. Enclose the entire joist run(s).

  • Seal seams with InfraStop® Foil Tape to a create vapor/moisture barrier.

  • Repeat for each joist that contains the Radiant Floor System.

2. Product Installed to Underside of Floor Joist - R-21 and a Radiant Reflector

  • Begin at one end of a joist cavity (that contains the Radiant Floor System) and install the product “end” with staples to the sub-floor or band board. Proceed down the joists by stapling each edge (or middle of the InfraStop® double bubble 48” wide product) to the face of each joist. Staple at intervals of approximately 3” to 4”. Enclose the entire joist run(s).

  • Seal seams with InfraStop® Foil Tape to a create vapor/moisture barrier.

  • Repeat for each joist that contains the Radiant Floor System.

3. Product Installed Inside the Joist Cavity - Diminished R-Value / Radiant Reflector

  • It is possible to install the InfraStop® inside the joist cavity (utilizing the double bubble insulation, Staple Tab product).

  • Start at one end of the house. Tuck the InfraStop® into the joist cavity.

  • Each edge of the product has a 3/4” staple tab. Determine the depth inside the cavity that the product is to be installed and attach the product with staples (through the tab) at approximately 3” to 4” intervals. Repeat on opposite joist.

  • The less air space between the product and the sub-floor, the lower the R-Value (although reflectivity will be maintained).

    Examples of benefits based on air space width above product: (0.5" air space = R-2.7) (0.75" air space = R-4.6) (3.5" air space = R-8.2)

4. Product Installed Inside the Joist Cavity with Mass Insulation Below Diminished R-Value / Radiant Reflector

  • It is possible to install the InfraStop® inside the joist cavity above a Mass Insulation Batt.

  • Utilize Reflective/Bubble/Bubble/Reflective, Staple Tab product Method specified in #3.

  • Refer to R-Values in Method #3 to determine benefit gain in your system.

5. Product Installed Inside the Joist Cavity with Mass Insulation Above R-2.7 with a 0.5” Enclosed Air Space or R-4.6 with a 0.75” Enclosed Air Space

  • InfraStop® can be installed below the Mass Insulation Batt.

  • Utilize Reflective/Bubble/Bubble/Reflective, Staple Tab product Method specified in #3.

  • Refer to R-Values in Method #3 to determine benefit gain in your system.

    Examples of benefits based on air space width above product: (0.5" air space = R-2.7) (0.75" air space = R-4.6)

Staple Tab Roll Sizes for In Between Joists

Square Edge Roll Sizes for Bottom of Joists

Thermal Insulation

There are 5 methods with varying levels of benefits.

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.

Benefits

  • 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 customer.support@insulationstop.com.

  • Other Concrete Insulation Projects

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