post frame building insulation r value

Increase R-Value

Boost Your Walls Thermal Performance with R-values Up to R-5.2.

easy to install insulation rolls for post frame buildings

Easy Installation

Save Time and Labor with Our User-Friendly, Quick-Install Rolls.

non perforated and perforated insulation fi foil icon

Perforated & Non Perforated

Choose Your Best Fit for Vapor Transmission and Moisture Control.

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Ideal for Masonry Walls

Engineered Specifically for Enhanced Durability and Efficiency in Masonry Applications.

Discover the Smart Insulation Choice for Masonry Walls

An insulation solution used on furred-out masonry walls, AA2 is remarkably easy to install and effective in improving building performance and comfort. Fi-Foil reflective insulation is one of the fastest-growing technologies in the world. It’s designed to get you R-value for less, saving labor and material. With third-party verified code compliance plus an industry-leading 10-year transferrable warranty, AA2 is a smart choice to insulate all your masonry buildings.

How It Works

Weve blended high-grade aluminum foil with a tough yet natural layer of kraft paper thats got an extra kick of polyethylene coating. Its like a dynamic duo for your insulation needs.

Here is where our innovation kicks in. AA2 Vapor Shield employs expander technology to create a purposeful gap between the foil and paper. This separation sets the stage for reflective air pockets, significantly boosting the insulations effectiveness. When installed on furring strips at either 16 or 24-inch intervals, these air pockets perform at their peak, improving thermal properties and energy efficiency.

AA2 Vapor Shield also features a reflective component, which minimizes the air pocket sizes within the cavity. This contributes to reduced convective heat transfer, which gives your building an environment thats more comfortable and excels in energy efficiency.

  • Add R4.1 - R5.2

  • Easy to Handle, Installs Faster

  • Save Labor

  • Save Warehouse Space

  • Save on Material & Shipping

  • High Performance and Compact

  • Provides for More Living Area Square-Footage for Increased Marketability

  • Lowest Cost per R value of All Masonry Wall Insulation

  • Low-e Reflective Surfaces Improve Performance of Enclosed Air Space

  • Lowers HERS and Other Energy Rating Indexes (ERI)

  • More Comfortable Buildings

  • Better Energy Efficiency

  • 10-Year Warranty

  • National Network of Insulation Distributors and Contractors

  • Two (2) Layer Reflective Insulation

  • Outer Layer of Natural Kraft Paper

  • Inner Layer of Premium Grade Aluminum Foil

  • Fi-Foil Expander Technology Separates Paper from Foil

  • Layers Create Two (2) Reflective Air Spaces

  • Low-e Surfaces to Reduce Radiant Heat Transfer

  • Quick Installation with Staple or Tape Tab

  • Use with Wood Furring or Metal Framing

  • 16" or 24" widths

  • Perforated or Solid

  • Lightweight 500 sqft Rolls

  • Third-Party Verified Code Compliance, IAPMO ER 291

  • Easily Combine with Other Mass Insulation as part of a Wall System

  • Add up to R5.2 with just 1-1/2" Enclosed Air Space

  • Verified Recycled Content >20%

  • Supports Sustainable Design Goals

Furring/Stud Spacing 16" O.C 24" O.C
Width Expanded 17.5" 25.5"
Diameter 10" 8"
Lineal Footage 375' 250'
Coverage 500 sq. ft. 500 sq. ft.
Weight 21 lbs 19 lbs

Test Method Description Results
ASTM E96 Water Vapor Permeance 6.5 Perforated
0.802 Solid
ASTM E84 Flammability Flame Spread Rating 45 Perforated
45 Solid
Smoke Developed Rating 10 Perforated
10 Solid
National Fire Protection Association Rating Class B (Perforated)
Class B (Solid)
ASTM D3310 Corrosivity N/A (Perforated)
None (Solid)
ASTM C-1244/Section 9 - Adhesive Performance Bleeding N/A (Perforated)
None (Solid)
Delamination None (Perforated)
None (Solid)
Pliability No signs of cracking or delamination
(Perforated / Solid)
ASTM C1338 Mold & Mildew N/A (Perforated)
Pass (Solid)
ASTM C1371 Foil Emittance 0.034 (Perforated)
0.034 (Solid)

Code & Compliances: Ensuring AA2 Vapor Shield Meets and Exceeds Industry Standards

  • Meets or exceeds ASTM C1224, the Standard Specification of Reflective Insulation.

  • Meets International Building, Residential and Energy Codes.

  • Meets Florida Building, Residential and Energy Conversation Codes.

  • IAPMO Evaluation Report number 0291

  • Meets ASTM C 1224, Reflective Insulation

  • Meets International Building Codes (IBC)

  • Meets International Residential Codes (IRC)

  • Meets International Energy Conservation Codes (IECC)

  • Meets Florida Building Codes (FBC)

  • Meets Florida Residential Codes (FRC)

  • Meets Florida Energy Conservation Codes (FECC)


Yes. The ASHRAE Handbook values are a subset of data from the National Bureau of Standards (NBS).

A water vapor retarder may or may not be part of the design depending on the climate zone and the other building components used in that particular section of the building envelope. If air containing water vapor is allowed to come in contact with a cold surface, then condensation will likely occur. Water vapor transmission can also occur even if the building envelope is air sealed or has an effective and properly installed air barrier. Some insulation systems should include a water vapor retarder and some should allow vapor transmission. Building codes and climate zones generally dictate the use of a water vapor retarder -- in short, the envelope is a system and the use should be carefully considered by the building designer.

As building envelopes are getting tighter, building scientists, energy centers and research organizations are suggesting that insulation products and facings used in hot humid climates have higher perm ratings for increased water vapor transmission. Fi-Foil's Hi-Perm versions are designed to meet or exceed these recommendations.

Reflective insulation is one or more low emittance surfaces installed in an enclosed air space. The more layers within the air space, the better the performance. Reflective insulation in a wall system can be compared to a double or triple pane window with low-e surfaces. Triple pane windows with low e surfaces perform better than a triple pane window without low e surfaces because of the reduction of radiation (low emittance) across the air spaces. Air inherently has an R-per-inch value of 5.6, and is an excellent insulator when radiation and convection are controlled. The ASHRAE Handbook has tables with values for various enclosed air spaces (0.5”, 0.75”, 1.5”, 3.5”, etc.) with high emittance surfaces (0.82 for common building materials) and values for air spaces with low emittance surfaces facing the enclosed air space (0.05 for low emittance materials like aluminum). Simply put, adding a low e material makes the enclosed air space perform better. A multilayer reflective insulation system in a wall cavity improves this system by further reducing radiant heat transfer and adding additional “panes”, a two layer reflective insulation could be compared to a double paned window; a three layer to a triple pane window, and so on.. The installation of reflective insulation in an enclosed space reduces thermal radiation to near zero. When the reflective insulation is installed to subdivide an air-filled region then heat transfer by convection is also reduced. Fi-Foil has single layer, two layer, three layer and even honey-comb layer reflective insulation products for various building applications, each with different performance levels and attributes for the particular application. These products also work very well with other types of mass insulation as hybrid systems by using the best attributes of each of the technologies (e.g. spray foam is great for air sealing and can have a high R--value per inch of thickness -- fiberglass and cellulose is an inexpensive material to reduce convection in the cavity). In some wall systems, especially wall cavities larger than 1.5”, a combination of reflective insulation with one or more of these mass insulation products, addresses all the modes of heat transfer -- often more cost effectively than one of the technologies used alone.

Probably not. The change from the standard version of AA2 Vapor Shield and VR Plus Shield to the Hi-Perm version only impacts the R-value by 0.1, so it has little, if any, effect in the overall load on the house. The overall point total should not change. However, the Florida Energy Code Form must indicate the correct R-value for inspection purposes.

Reflective insulation has little effect on heat transfer by conduction through the air between hot and cold surfaces. Air with an R-per-inch of 5.6 is an excellent insulator when radiation and convection are controlled. The installation of reflective insulation in an enclosed space reduces thermal radiation to near zero. When the reflective insulation is installed to subdivide an air-filled region then convection is also reduced.


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