What is Between Joist Foil Insulation?
EcoFoil® pre-cut rolls of double bubble foil/foil insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets. This 1/4" - 5/16" thick insulation provides superior protection against radiant heat transfer and also provides an effective vapor barrier preventing condensation which can cause mold. Unlike traditional insulation this product is not rated by R-value. R-values are based on thermal resistance (how long heat takes to pass through the product); the thicker it is the higher the R-value. Bubble insulation is rated by its high reflectivity, 96%, and a low emissivity, 4%. Only 4% of radiant heat passes through the insulation. Simply put we are not trying to slow the way heat passes through the insulation but trying to eliminate heat from passing through it.
Where is Between Joist Foil Insulation Used?
Pre-cut double bubble insulation is designed to fit in between either a studded wall or floor joists that are 24" on center. The 24" wide insulation is light weight and includes a 3/4" flat staple tab on each side for easy installation.
You must use tape when seaming the insulation, this way the product acts as one sheet and maintains the moisture barrier.
Pre-cut rolls of our foil/foil bubble insulation are easy to install into any framing that is 24" on center. The 1/4" - 5/16" thick insulation is 24" wide, 22-1/2" wide double bubble insulation in the center with a 3/4" staple tab on each side. Each roll comes in a 125' roll. Simply measure the length of each cavity, cut the insulation to length and install with a staple gun along both edges. Please make sure to put plenty of staples along each side so the product is tight to the framing providing a vapor barrier, keeping any moisture from passing through it. The insulation is light weight and cuts easily with either scissors or a utility knife.
If you have any installation or product questions please call our product specialists at 888-349-3645.
Between Joist Foil Insulation Specifications
Download a printable spec sheet for this product: Between Joist Insulation (425 KB)
|Nominal Thickness||1/4" - 5/16"|
|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)|