post frame building insulation r value

Increase R-Value

Boost Your Insulation Performance with M-Shields R-4.1 - R-5.1 Rating.

easy to install insulation rolls for post frame buildings

Easy Installation

Simplify Your Project & Save Money with Quick and Hassle-Free Installation.

non perforated and perforated insulation fi foil icon

Perforated & Non Perforated

Choose Your Ideal Option, Available in Both Perforated and Non-Perforated Versions.

masonry wall insulation fi foil icon

Ideal for Masonry Walls

Specifically Engineered for Optimal Performance in Masonry Wall Applications.

The Industry Leading Zero Mold Reflective Insulation for Masonry Walls

An advanced insulation used on furred-out masonry walls, M-Shield™ is designed to resist mold growth by combining a synthetic polymer facing on premium grade aluminum foil. The synthetic polymers contain no cellulose and therefore reduce the risk of exposure to create safer, better air quality. When tested to ASTM standards, M-Shield™ exhibited zero growth of mold or mildew. Remarkably easy to install, Fi-Foil reflective insulation is one of the fastest growing technologies in the world—designed to get you more R-value for less, saving labor and material.

With third-party verified code compliance plus an industry leading 10-year transferable warranty, in more humid climates, M-Shield™ is a smart choice to insulate all your masonry buildings.

How It Works

M-Shield™ has two layers. The inside layer is aluminum foil. The outer layer is a synthetic polymer material and the product is designed with small perforations to allow vapor transmission for applications not requiring a vapor retarder.

Our technology uses expanders that separate the paper from the foil to create reflective air spaces. When installed on furring strips, 16” or 24” on-center, air is trapped inside the cavity and the reflective components improve performance of the air space.

Since the reflective layers also reduce sizes of the air spaces in the cavity, reflective insulation also reduces heat transfer by convection. The result is a more comfortable building and better energy efficiency.

  • Add R-4.1 - R-5.1

  • Improve Indoor Air Quality

  • Third-Party Verified Code Compliance, IAPMO ER 291

  • Lightweight 500 sq ft Rolls

  • 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

  • Paperless Reflective Insulation for Mold Sensitive Projects
  • Two (2) Layer Insulation

  • Outer Layer of Synthetic Polymer Facing

  • Inner Layer of Premium Grade Aluminum Foil

  • Fi-Foil Expander Technology Separates Outer Layer from Foil

  • Creates Two (2) Reflective Air Spaces

  • Low-e Surfaces 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 sq ft Rolls

  • Third-Party Verified Code Compliance, IAPMO ER 291

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

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

  • Meets ASTM C 1224, Reflective Insulation

  • Zero Mold Growth

  • Class A Flammability Rating

  • Supports Sustainability Goals

  • National Network of Insulation Distributors and Contractors

Furring/Stud Spacing 16" O.C 24" O.C
Width Expanded 17.5" 25.5"
Lineal Footage 375' 250'
Coverage 500 sq. ft. 500 sq. ft.
Weight 16 lbs 16lbs
Pallet Quantity 36 Rolls 40 Rolls

Test Method Description Results
ASTM E-96 Water Vapor Permeance 7.46 (Classification: Not A Vapor Retarder)
ASTM E-84 - Flammability Flame Spread rating <25
Smoke Development <50
Interior Wall & Ceiling Finish Application Class A
ASTM D-3310 Corrosivity None
ASTM C-1244/Section 9 - Adhesive Performance Bleeding None
Delamination None
Pliability No signs of cracking or delamination
ASTM C-1388 Mold & Mildew No Growth
ASTM D-1371 Emissivity 0.034

Meeting the Standards: M-Shields ASTM Certification and Zero Mold Growth

  • Meets ASTM C-1224-03, Standard Specification of Reflective Insulation

  • Meets National/Florida Building and Energy Code Requirements

  • 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).

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.

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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