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post frame building insulation r value

Add R-Value & Sq. Footage

Add Up to R-7.1 with 1-5/8" Enclosed Cavity Air Space; Gain Sellable Sq. Ft. with Slimmer Walls.

easy to install insulation rolls for post frame buildings

Easy Handling & Installation

Quick and Easy Install with Staple or Tape Tab Options.

reflective insulation with limited lifetime warranty

10-Year Warranty

Experience Peace of Mind With Our 10-Year Transferable Warranty.

masonry wall insulation fi foil icon

Stop Radiant Heat Transfer

Low-E Layers Stop 97% of Radiant Heat Transfer to Maximize Performance and Improve Comfort.

Discover The Best Insulation for Masonry Walls in Zones 1 & 2

A multi-layer reflective wall insulation, VR Plus Shield enhances enclosed cavity air space and stops up to 97% of radiant heat transfer. This unique insulation has multiple low-e layers that expand within the cavity to create three reflective air spaces. Gain up to R-7.1 on 1-5/8” framing for a higher-performance wall system.

An easy upgrade from R-4.1 insulation to help builders qualify for DOE New Energy Efficient Home Tax Credits. Cost-effective and remarkably easy to install, this powerful multi-layer low-e technology boosts R-value by utilizing less cavity air space--allowing for a slimmer wall system to provide you with more sellable square footage in zones 1 & 2.

A Cost Effective Alternative to 3/4" Foam Board

One (1) roll of VR Plus equals 16 sheets of 4x8 foam board. Packaged in compact 500 sq. ft. rolls, our multi-layer reflective insulation offers easier handling, reduces waste, and lowers the chance of product damage due to weather when staged on job sites.

  • Add R-6.5 - R-7.1

  • Low-e Surfaces Reduce 97% of Radiant Heat Transfer to Improve the Performance of Enclosed Air Spaces

  • Lowers HERS and Other Energy Rating Indexes (ERI)

  • High Performance and Compact

  • Lightweight 500 sq. ft. Rolls

  • Easy to Handle, Installs Faster

  • Save Labor

  • Save on Material & Shipping

  • Save Warehouse Space

  • Lowest Cost per R-value of All Masonry Wall Insulation

  • Boosts R-Value Utilizing Less Air Space

  • Gain Sellable Square-Footage for Increased Marketability

  • More Comfortable, Resilient Buildings

  • Improved Energy Efficiency

  • 10-Year Transferable Warranty

  • National Network of Distributors and Contractors

  • 16" or 24" widths

  • Perforated or Solid versions are available

  • Creates Three (3) Reflective Air Spaces

  • Outer Layer of Natural Kraft Paper

  • Inner Layers of Premium Grade Aluminum Foil

  • Fi-Foil Expander Technology Separates Paper and Foil Layers

  • Perforated Version Allows Vapor Transmission in Hot-Humid Climates

  • Quick Installation with Staple or Tape Tab

  • Install on Wood Furring or Metal Framing

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

  • Supports Sustainable Design

  • Class A Flammability Rating

  • Verified Recycled Content >20%

Furring/Stud Spacing 16" O.C 24" O.C
Width Expanded 17.5" 25.5"
Diameter 12" 10"
Lineal Footage 375' 250'
Coverage 500 sq. ft. 500 sq. ft.
Weight 29 lbs 27 lbs

Test Method Description Results
ASTM E-96 Water Vapor Permeance 2.6 (Perforated)
0.18 (Solid)
ASTM E-84-94 Flammability Flame Spread Rating <25 (Perforated)
<25 (Solid)
Smoke Developed Rating <50 (Perforated)
<50 (Solid)
National Fire Protection Association Rating (Foil Side) Class A
R-Value for a 1-1/2" Cavity R-6.5
R-Value for a 1-5/8” Cavity R-7.1
ASTM C-1244/Section 9 - Adhesive Performance Adhesive Performance Bleeding None
Delamination None
Pliability No signs of crack
ASTM C-1338 Mold & Mildew Pass
ASTM C-1371 Foil Emittance 0.034 (Solid)
Meets International & Florida Building Codes, IAPMO ES Report #0291
ASTM D-3310 Corrosivity None

Code-Compliant Confidence with VR Plus Shield

  • Meets ASTM C-1244 Standard Specification for Reflective Insulation

  • Meets International & Florida Building & Energy Code Requirements

  • See IAPMO ES Report Number 0266.

  • 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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