Cutting Edge

Floor Joist Insulation - 16" x 125' - 166 sq. ft.

  • Sale
  • $68.25
  • Regular price $89.95

Size: 16"x125' Roll - Double Bubble Foil/Foil

What is Between Joist Foil Insulation?

 pre-cut rolls of Refelctive Foil/Bubble Insulation consists of two layers of poly bubble insulation which is then covered on both sides by a reflective metalized/aluminum composition. It provides superior protection against radiant heat transfer and also provides an effective vapor barrier if properly sealed with foil tape.

Where is Between Joist Foil Insulation Used?

Pre-Cut Reflective Bubble Insulation is designed to fit in between the floor joists of a home or building. It is pre-cut at 16 ½" wide, very light and features a tab on both sides for easy stapling during installation. This insulation does create an R-Value but it is determined by the neutral air space in the assembly of the insulation. The more neutral air space that you create between the insulation and the living space, the higher the R-Value will be.

This pre-cut bubble insulation also fits perfectly in between the studs of a stud wall. It works great for basement wall insulation because it creates a vapor barrier. This product is also commonly used as a crawl space vapor barrier.

Between Joist Foil Insulation Specifications


Nominal Thickness 1/4" - 5/16"
Weight 1.25oz/sq. ft.
Temp Range -50F to 180F (ASTM C411)
Fire Rating Class 1/ Class A (ASTM E84-09)
Thermal Resistance R-3 to R-21 (Varies depending on application)
Emissivity 0.04 (ASTM C1371)
Reflectivity 0.96 (ASTM E903)
Water Vapor Permeability <0.02 Perms (ASTM E96)
Resistance to Fungi Does Not Promote Growth (ASTM C1338)
Fire Rating-Full Room Burn Pass (ASTM NFPA 286)