• Reflective insulation reflects heat into basement

    Reflects heat downward

  • Reflective insulation reflects heat upwards

    Reflects heat upward

  • Reflective insulation installs easily

    Quick, easy installation

between joist reflective insulation

Double Bubble reflective insulation for floor joists and wall studs

Whether you're looking to add insulation between joists, directly on top of joists, or between wall studs, EcoFoil has a solution to fit your needs. EcoFoil Between Joist Insulation is perfect for those small spaces between floor joists and studs in crawl spaces or basements. With pre-cut widths of 16" or 24" available, reflective insulation rolls are lightweight and easy to handle and fit perfectly between standard floor joists and wall studs.

See how it works

Reflects radiant heat back to its source

Between Joist Insulation is an effective way to reflect heat back into your basement in the winter months. Whether your heat source is upstairs, downstairs, or both, installing reflective insulation is a great way to save money on energy bills year round.

Recommended products: Between Joist Insulation

stapling reflective insulation between joists

Quick, clean, and easy

Reflective Joist Insulation features a tabbed edge that runs along both sides, which allows you to staple the tabs against the joists/studs for a quick and clean installation. Installing EcoFoil Between Joist Insulation will not only insulate those tight spaces, it also provides a moisture vapor barrier and prevents cool, damp air from invading the floor above.

  • Scissors and knife for radiant barrier installation

    Scissors/utility knife

  • staple gun

    Staple gun (3/4" staples)

  • Install radiant barrier with 1-2 people

    1–2 people

  • Insulation tape for radiant barrier

    Insulation Tape (to seal seams)

Floor Joist Insulation Installation Instructions:

Floor Joist Insulation, Between Joists

Floor Joist Insulation, Between Joists

Download Instructions (PDF)
Floor Joist Insulation, Under Joists

Floor Joist Insulation, Under Joists

Download Instructions (PDF)
Wall Joist Insulation, Between Joists (no fiberglass)

Wall Joist Insulation, Between Joists (no fiberglass)

Download Instructions (PDF)
Wall Joist Insulation, Between Joists (combined w/ fiberglass insulation)

Wall Joist Insulation, Between Joists (combined w/ fiberglass insulation)

Download Instructions (PDF)

Floor Joist Insulation

Why use EcoFoil Floor Joist Insulation?

  • Reflects 96% of radiant heat - Find out how a radiant barrier works
  • Works in both warm and cold climates
  • Installs easily
  • Lightweight and easy to handle
  • Versatile enough to fit between joists/studs or attach directly
  • Very durable and can't be ripped or torn by hand
  • Safe to handle and requires no special clothing or breathing equipment

    More About EcoFoil Joist Insulation

    15% or more of a buildings total heat loss can be attributed to an inadequately insulated crawl space. Our between joist insulation is constructed with a double layer of polyethylene bubbles bonded between two layers of radiant barrier. The double bubble layer creates a thermal break, while the foil blocks and reflects 96% of radiant heat away from your home in the summer, and back into your home in the winter – thus working effectively in both hot and cold climates.

    Floor Joist Insulation Reviews:

    Customer Reviews

    Based on 35 reviews
    Ron Emrich
    Good product

    Well made.easy to install. Looks great. Highly recommend.

    Kelsey and Poppys Mom
    Great product

    Very easy to install. Cut to exactly the right width for installation. Product really stats up with little effort of staples. Great.

    thomas mitchell
    very pleased with product

    Finally got a chance to install this weekend. worked perfectly for the screened in deck which we converted into an enclosed sunroom.

    Frank Madden
    Pier and beam insulation in Galveston

    Haven’t used it yet. Planning on installing it this weekend. 11/18/23.

    joseph berry
    Great product

    Excellent product. Worked like it was supposed to well advertised