Floor Joist Insulation 24" x 125'

Floor Joist Insulation 24


1 – 4$119.99
5 – 9$110.00
10 – 19$100.00
20 +$90.00

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EcoFoil floor joist insulation is a low cost method for insulating floor joists. Buy floor joist insulation and make your home more comfortable by taking advantage of the following benefits:
  • 24” x 125’ foil insulation roll = 250 Square Feet.
  • Staple tabs make installation quick and convenient.
  • Cut to fit framing built on 24” centers.
  • Thermal insulation of R-3 to R-17.
  • Reflects up to 96% of radiant heat back to its source.
  • Ultra-low emissivity rating of 4%. 
  • Heavy duty bubble wrap insulation is easy to install.
  • Class 1/Class A fire rating to reduce the spread of flames in the event of a fire.
  • Double bubble construction stops conductive heat transfer.
  • Class 1 vapor barrier. 
  • Stops condensation.
  • Safe for you and the environment throughout the entire life of the product.
  • Resists growth of mold and other fungi.
  • Heat management in both summer and winter.
  • Increases the performance of traditional “mass” type insulations such as fiberglass and foam.
  • 20 year warranty.
This between joist insulation roll measure 24" x 125' to get you started on your joist insulation project.

What is Between Joist Insulation?

EcoFoil® 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 Insulation Used For?

Pre-Cut Reflective Bubble Insulation is designed to fit in between the floor joists of a home or building. It is pre-cut at 24" wide, very light and features a 1" 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.

Download the Between Joist Installation Instructions(PDF)

Between Joist Foil Insulation Specifications

Download a printable spec sheet for this product: PDF DownloadBetween Joist Insulation (425 KB)

Nominal Thickness5/16"
Weight1.25oz/sq. ft.
Temp Range-50F to 180F (ASTM C411)
Fire Rating Class 1/ Class A (ASTM E84-09)
Thermal ResistanceR-3 to R-21 (Varies depending on application)
Emissivity0.04 (ASTM C1371)
Reflectivity0.96 (ASTM E903)
Water Vapor Permeability<0.02 Perms (ASTM E96)
Resistance to FungiDoes Not Promote Growth (ASTM C1338)
Fire Rating-Full Room Burn Pass (ASTM NFPA 286)

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