FSK vapor barrier offers contributes significantly to the energy efficiency and longevity of buildings and HVAC systems. FSK stands for Foil-Scrim-Kraft, which refers to its composition. The facing consists of a layer of aluminum foil, a layer of fiberglass scrim, and a layer of kraft paper. This combination provides excellent barrier properties against moisture, vapor, and radiant heat, making it an ideal component in thermal insulation systems.
Aluminum foil layer provides reflectivity, reflecting heat away and contributing to thermal insulation. It also offers moisture resistance, helping to prevent the passage of water vapor.
Fiberglass scrim layer adds strength and tear resistance to the material, making it more durable and easier to handle during installation.
Kraft paper This layer provides a sturdy backing and helps to absorb any condensation that may occur on the surface of the aluminum foil.
Attic insulation: It is often used as a facing for attic insulation to prevent moisture from entering the insulation and reducing its effectiveness.
Wall insulation: It can be used as a facing for wall insulation in both new construction and retrofit projects.
HVAC systems: It is used in ductwork and other HVAC components to prevent moisture from damaging the equipment and reducing its efficiency.
Crawl spaces: It can be used in crawl spaces to help control moisture and prevent mold growth.
Composition |
Description |
Value (English) |
Value (Metric) |
Foil |
Aluminum |
0.28 mil |
7 micron |
Reinforcing- MD |
Fiberglass |
1/2 inch spacing |
12.5mm spacing |
Reinforcing-XD |
Fiberglass |
1/3 inch spacing |
12.5mm spacing |
Adhesive |
Polyethylene |
- |
- |
Kraft |
Natural |
49lbs / 3000 ft2 |
80gsm |
Physical properties |
Test Method |
Value (English) |
Value (Metric) |
Basis weight |
Scale |
23.5 lbs / 1000 ft2 |
20.1595%gsm |
Permeance (WVTR) |
ASTM E96, Procedure A |
0.1 perm |
5.75 ng/N.s |
Tensile Strength-MD |
ASTM D828 |
34 lbs / In |
150 N/25mm |
Tensile Strength-XD |
ASTM D828 |
18.2lbs / In |
80 N/25mm |
Burst Strength |
ASTM D774 |
58psi |
40 N/cm2 |
Low temperature Resistance |
ASTM D1790 4 hrs @ -40℉ (-40℃) |
Remains Flexible No Delamination |
Remains Flexible No Delamination |
High temperature Resistance |
ASTM D1790 4 hrs @ +240℉ (+116℃) |
Remains Flexible No Delamination |
Remains Flexible No Delamination |
Emissivity |
ASTM E408 |
-0.03 |
-0.03 |
Available Roll Width: 1.0m, 2.0m, 1.25m, 1.30m, 1.35m