Fiberglass R-Values and Staple Tab Foil Insulation

At InsulationStop, we supply radiant barriers and reflective foil insulation. Our products are used as stand alone insulation in certain applications or in conjunction with other insulation types such as fiberglass.

Fiberglass insulation is the most common type of insulation in residential construction and comes in either batt or roll form. Batts are pieces of fiberglass insulation you install one after the other, generally in attic spaces. Rolled fiberglass, as its name implies, is sold in rolls that you cut to length to fit the wall, ceiling, or crawlspace cavity you are insulating.

Both of these fiberglass types are available in a wide selection to fit your particular application.  The thickness of the insulation determines the R-Value. This ranges somewhat by manufacturer but is typically 2.9 to 3.8 per inch.

The table below is a quick reference for you to easily compare fiberglass R-Values with their corresponding thicknesses.

R-Value of Insulation

Thickness in Inches
R-113 1/2"
R-133 5/8"
R-153 ½" High Density
R-196 ¼"
R-215 ½"
R-258  1/2"
R-309 ½"

15 ½"

Our unique Staple Tab Foil Double Bubble Insulation is designed with the same widths you need to insulate in walls, ceilings, crawlspaces, and floor joists. It can be installed with or without fiberglass insulation depending on your application. The unique "Staple Tab" enables you to staple the sides of the product either on the face of the stud or joist or to recess the insulation in the stud or joist cavity, installing the same as you would fiberglass insulation.

We hope this information is helpful. At anytime during your project you have questions, please don't hesitate to contact us. Thank you for shopping at the InsulationStop, your leader in radiant barrier and reflective foil insulation.

2 thoughts on “Fiberglass R-Values and Staple Tab Foil Insulation”

  • peter

    I bought some of double foil insulation.
    I have a radiant heat system in my house (warm floor) – hydronic.
    My living room is heated this way, and there’s an unheated crawlspace below this room
    So, there are lots of insulation between the floor joists, 6 inch fiberglass insulation.
    Now my question is - how should I install your product?
    Should I take out the old fiberglass, put in radiant barrier between joists, and then install fiberglass to the underside of the barrier?
    Or, can I go an easy way, by just stapling my radiant barrier to floor joists below the fiberglass? Looks way nicer this way....
    What would be a more efficient way to go?
    Have you done any studies about those two different ways of installation?

    • Insulation Stop
      Insulation Stop August 19, 2011 at 7:41 pm

      Peter. What is the construction of your finished floor system? Is your radiant heat in the sub floor, or in the slab? Also please describe your crawlspace and its ventilation if you can.

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