Scrim Insulation Facing, widely known as Foil-Scrim-Kraft (FSK) insulation facing, is a premium, high-performance laminated vapor barrier engineered for superior thermal efficiency, mechanical strength, and moisture protection. Consisting of a highly reflective aluminum foil layer, a heavy-duty fiberglass reinforcement scrim, and a protective kraft paper backing, this multi-layer composite serves as the industry standard for HVAC duct wraps, pipe insulation, and building envelope thermal systems.
FSK Foil Scrim Kraft insulation facing provides an all-in-one solution for sealing and protecting insulation materials in residential, commercial, and industrial structures. The outer aluminum foil layer reflects radiant heat and prevents air infiltration while providing an impermeable barrier against moisture and vapor transmission.
Embedded within the lamination is a bi-directional fiberglass scrim mesh that supplies high tensile strength and tear resistance, preventing puncturing during installation and long-term service. The heavy-duty kraft paper substrate provides backing support and stability for seamless lamination with fiberglass, mineral wool, and foam board insulation. Designed to withstand demanding environmental conditions, this insulation facing ensures long-lasting system integrity, preserves R-value performance, and lowers heating and cooling energy costs.
High-purity aluminum foil blocks moisture ingress, air leaks, and radiant heat transfer, protecting insulation cores from condensation and thermal degradation.
High-density fiberglass scrim mesh prevents tearing, puncturing, and mechanical damage during handling, wrapping, and job-site installation.
Formulated to meet strict building safety codes with low flame spread and smoke development ratings for HVAC and commercial building applications.
Maintains structural thermal performance, reduces thermal bridging, and significantly lowers building HVAC energy consumption.
Designed to resist degradation from atmospheric pollutants, ambient humidity, mold, and chemical exposure in harsh building environments.
Flexible construction allows smooth wrapping around rectangular and round ductwork, pipes, and irregular surfaces without cracking or delaminating.
Applied as an external vapor barrier wrap for supply and return air ducts, insulating against thermal loss, air leakage, and condensation buildup.
Laminated directly onto fiberglass batts, mineral wool blankets, and rigid foam boards for walls, ceilings, attics, and floors.
Used as a protective jacketing for chilled water lines, steam pipes, and hot water systems in industrial processing plants and commercial facilities.
Ideal for lining roofs and side walls in pre-engineered metal buildings (PEMB) to control condensation and reduce solar heat gain.
Facing Properties |
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Physical properties |
Test Method |
Value (English) |
Value (Metric) |
|
Basis weight |
Scale |
23.5 lbs / 1000 ft2 |
115gsm |
|
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 |
17lbs / In |
75 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
Insulation Facing Composition |
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Composition |
Description |
Value (English) |
Value (Metric) |
|
Foil |
Aluminum |
0.28 mil |
7 micron |
|
Reinforcing- MD |
Fiberglass |
2 inch spacing |
8 /100mm |
|
Reinforcing-XD |
Fiberglass |
3 inch spacing |
12 / 100mm |
|
Adhesive |
Polyethylene |
- |
- |
|
Kraft |
Natural |
49lbs / 3000 ft2 |
80gsm |
A: Scrim Insulation Facing, or Foil-Scrim-Kraft (FSK) insulation, is a three-layer laminated composite made of aluminum foil, fiberglass reinforcement scrim, and kraft paper. It acts as a vapor barrier, radiant heat reflector, and protective cover for various insulation materials.
A: The fiberglass scrim acts as a reinforcing grid within the foil and kraft paper layers. It dramatically increases the material's tensile strength, burst resistance, and tear resistance, ensuring it withstands physical abuse during installation and operation.
A: The aluminum foil layer forms an impermeable vapor barrier that prevents humid ambient air from reaching cold duct surfaces. This prevents moisture from condensing inside the insulation, which preserves thermal efficiency and prevents mold growth.
A: FSK facing is primarily designed for indoor or enclosed applications. For exposed outdoor applications, additional weatherproofing jackets or UV-resistant protective cladding should be installed over the FSK facing.
