Fi-Foil - Alfol® Type 1A

Fi-Foil - Alfol® Type 1A
Reflective Insulation & Vapor Barrier
Alfol Type 1A is a multi-layer reflective insulation and vapor barrier intended for use on furred-out masonry walls. The inside layer is 0.00045" aluminum foil. The outer layer is 35 lb. natural kraft paper coated with polyethylene, laminated to 26 lb. medium linerboard which functions as an expander that separates the paper from the foil creating a reflective air space. When installed on furring strips spaced 16" or 24" on-center, a second reflective air space is formed. This air space is dependent upon the thickness of the furring strip selected.
How Reflective Insulation Works
Heat is transferred by one of three methods, which include conduction, convection and radiation . In general, any material added to a cavity increases conduction across that air space. Most insulating products on the marke tresist heat transfer by forming small air or gas pockets between layers of building materials such as fiberglass, recycled paper, and foam. The small spaces restrict air movement, thereby reducing heat flow by convection . However, these standard building materials are not as effective against radiant heat transfer. Reflective insulation functions by fo rming these dead air spaces with layers of paper, plastic, and aluminum. The high reflectivity and low emissivity of the aluminum material has the added benefit of blocking radiant energy, so heat transfer through radiation is also significantly reduced . Reflective insulation provides resistance to heat gain in summer conditions and heat loss in winter conditions. This lowers both cooling and heating costs, reducing energy expenditures throughout the year.
For more information about this product, visit Fi-Foil at http://www.fifoil.com/