Exterior Applications:

Our videos demonstrate a clear and simple approach that works. Both a skilled professional or a novice carpenter can install the self-flashing interlocking panels and expect the same great results. InSoFast is 4 times faster and 30% less expensive. For more information about material cost go to our comparison page: Compare cost/value

If you can go to the wall once and be done,

1 Trip to the wall;
  1. Weather Resistant Barrier
  2. Foam Board with Fasteners
5 Parts- 1 Panel, 4 Screws, Ready for siding;

Why would you work this hard?

5 Trips to the wall
  1. Weather Resistant Barrier
  2. Drainage Mat
  3. Foam Board with Fasteners
  4. All Weather Flashing Tape
  5. Furring Strips and Heavy Duty Fasteners
25 Parts and pieces

Panel Features

1One Part Not So Many Pieces
  • R-10 Closed-cell EPS Continuous Insulation
  • Stable insulation zero thermal drift
  • Built-in Drain and Dry Technology
  • Rot-Resistant, Embedded Stud Framing
  • Interlocking Tongue and Groove Edges
  • Less work faster results!
2The most cost effective way to install continuous insulation.
  • Simple to install, less parts and pieces
  • Self-flashing panels; no taping seams
  • No special tools or training needed
  • One trip to the wall.
  • Lives up to its name: In So Fast
3Wall Protection Rain Screen Insulation

  • Self-aligning interlocks provides straight and true framing
    • The panel adds a secondary layer of defense.
    • Interlocking self-flashing barrier
  • InSoFast’s rain screen, “drain-and-dry” technology
    • Accomplished in one step, that takes 4 steps with traditional assemblies.
  • The built-in dual drainage planes
    • Allows excess water to, “drain-and-dry”; your building safe and dry.
  • Exterior Rated Moisture Control Tested to and exceeds;
    • *ORSC, Section R703.1.1-approved rain screen and drainage technology

"Oregon Residential Specialty Code"

The exterior wall envelope shall be installed in a manner such that water that enters the assembly can drain to the exterior. The envelope shall consist of an exterior veneer, a water-resistive barrier as required in Section R703.2, a minimum 1/8-inch (3 mm) space between the water-resistive barrier and the exterior veneer, and integrated flashings as required in Section R703.8. The required space shall be formed by the use of any noncorrodible furring strip, drainage mat or drainage board. The envelope shall provide proper integration of flashings with the water-resistive barrier, the space provided and the exterior veneer. These components, in conjunction, shall provide a means of draining water that enters the assembly to the exterior.

4Double Thermal Disconnect

Double Thermal Break

  • The panel provides a double thermal and moisture disconnect
  • Uninterrupted continuous insulation (CI)
    • InSoFast goes beyond just “CI”. The fastener that attaches the panel is recessed ½” and insulated reducing the thermal short to near zero.
    • Fastening the exterior cladding does not penetrate the weather resistant barrier keeping your building secure and dry.
  • EXe 2.5 panel is the best choice for CONTINUOUS-continuous insulation.

Panel Benefits

1The easiest way to install continuous insulation.
Double Thermal Break
A complex and labor intensive multi-step and multi-piece assembly. An engineered one step to install panel. Same results less risk.
  • The human factor is engineered out of the installation process.
    • Less parts and pieces = less training
  • InSoFast will not rot, rust, warp, or decay
  • Maintains its R-Value in extreme conditions, year after year.
  • Exceed expectations, assemble less and Build Better. 
2The best Continuous Insulation because;
  • Combines rainscreen, insulation, and attachment
    • Self-flashing panels; no taping of the board seams
    • Drains better, dries better, performs better
  • Thermally recessed fasteners; no cold spots
    • No energy penalty for the fastener
    • No energy penalty for the studs
    • Non-conductive stud framing
    • Non corrosive stud...no rusting
  • Lives up to its name: In-So-Fast
3NFPA 285 Cladding Options
  • One detail, one solution
  • Nationwide Code Compliance
  • Rigorous testing and assurances
  • Continuous insulation for nearly all assemblies

National Fire Protection Association (NFPA) in the International Building Code states that – wall assemblies shall be tested in accordance with and comply with the acceptance criteria of NFPA 285. InSoFast has tested and passed these stringent guidelines, here are a few of the possibilities that will work with the InSoFast continuous insulation panel. Please contact us for specific details.

Load Bearing Masonry Assemblies
NFPA 285 compliant assemblies-cmu-adhered stone NFPA 285 compliant assemblies-cmu-adhered brick NFPA 285 compliant assemblies-cmu-horizontal Nichiha siding NFPA 285 compliant assemblies-cmu-horizontal cement board siding
Cultured Stone Veneer Thin Brick Veneer Vented Rain Screen Cement Board Siding
Steel Frame Assemblies
NFPA 285 Compliant steel framing-vertical siding NFPS 285 compliant assemblies-steel framing-stucco NFPA 285 Compliant steel framing vertical cement board NFPA 285 Compliant steel framing offset framing
Steel Siding 3-Coat Stucco Vertical Siding Vertical Siding Rain Screen

Exterior NFPA 285 - Nichiha


Video Links

All Concrete House Interior and Exterior Application

This is an all concrete home being built in North Carolina; In this series of videos we will explore finishing concrete with InSoFast.

Panel Details


InSoFast Flat Panel EXe 2.5 is a feature rich continuous insulation panel. The EXe is optimized for exterior wall applications

For legal sake, we should probably clarify that you can try InSoFast panels at home. We don't necessarily condone trying the rock-climbing part at home.

The InSoFast Panel features built-in drainage channels that are specifically designed to direct the flow of moisture out of the wall.

Exterior Window Details

Side Jamb Flashing Detail describes how to flash around an exterior window. This process added a 2 1/2" extension jamb so that the window will sit flush with InSoFast insulation panels. The jamb also provides an attachment point for siding.

Sill Flashing Detail describes how to flash around the sill of a  window. This process added a 2 1/2" extension jamb so that the window will sit flush with InSoFast insulation panels. 

Typical Head Jamb Flashing Detail to direct water around and away from the window opening.

InSoFast Panel Attachment

This video illustrates a method for installing a pre-engineered insulated window buck being nailed to the wall. Additionally it shows a nail gun applying the panels to the wall.

This video illustrates the use of a starter track along the base of a home. The track contains special "weep holes" which direct moisture off and away from the surface of the home.

Built-in stud framing allows for fast installation exterior continuous insulation. During warmer weather the insulation can be nailed to the wall.

Finish Attachment to InSoFast Panels

Attaching Siding directly to the built-in stud framing of the insulation panels. During warmer weather the insulation can be nailed to the wall.

In this video we demonstrates how Dan and the crew of MJ Builders attach James Hardie siding board to InSoFast panels. Dan illustrates a few techniques to assure a 32" offset of the lap siding. 

InSoFast Metal colored flashing roof detail. This is coil stock metal bent to protects the exposed InSoFast Foam from UV degradation.

Remodeling the exterior wall with InSoFast and Hardie siding on a 1960's era colonial home to update and give the home a face lift and complete energy retrofit.

Exterior Finishes

Technical description of InSoFast exterior applications over steel studs here we discuss a few of the  different finishes.

Why InSoFast's panel is 24" x 48" expanded polystyrene. InSoFast could have manufactured our panel with any type of insulation and we chose shape molded Expanded Polystyrene. In this video we explain a few of the reasons.

Board and Batten Exterior with InSoFast panels. Our use of board and batten siding demonstrates one of the many exterior finishing choices you have when you insulate with InSoFast.

Architect and Contractor Reviews

Tom from TBD Architecture discusses at the PassiveHouse 2016 Conference InSoFast affordability, cost of ownership is a wash! Better to invest in insulation then pay more for energy, which is an uncertain cost over time.

InSoFast exterior project in Minneapolis it isn’t a typical job site with a professionally-trained crew.  This is a Urban Homeworks project coordinated by Minneapolis-based non-profit focused on rebuilding neighborhoods with the help of volunteers and students.

InSoFast exterior insulation vs Complexity (the human factor) why architects and community leaders choose InSoFast. Complex insulation methods are tedious and simple mistakes on the different layers can lead to major problems.

Physical Properties



EXe 2.5 Insulated Panel with Studs

EXe 2.5 Flat Panel Details
dwg pdf EXe 2.5 zip file
InSoFast Exterior Architectural Submittal pdf
Panel Body Dimensions 24in × 48in × 2½in
Drainage Channel Dimensions 24in × ¼in × ¼in


8 sq-ft

R-Value ASTM C518


Comparable Performance to

2×4 Wall/R-15 Batts

ASTM C578 Type II

Closed-Cell, injection-molded EPS 

Canadian Standards  CAN/ULC S701 Type 2

ASTM C303 Foam Density

1.35 lbs. per cubic foot

ASTM E96 Water Vapor Permeability

 (Class III Vapor Retarder) 3.5perm/in

Maximum Service Temperature (long term)

167°F = 75 Celsius (°C)

Co-Polymer Polypropylene Insulated Stud

Recessed ½in below Surface

Interlocking Edges

Cutting Indication Lines

Designed Ready for Finishing Attachment

Both Interior/Exterior (drywall, siding, etc.)

Exterior Rated Moisture Control

ORSC, Section R703.1.1-approved rain screen and drainage technology on both sides

Exterior Application

Interiors Application


The InSoFast panel studs provide a simplified approach to wall assembly. The InSoFast stud are injection-molded high-strength recycled polypropylene plastic.  A special co-molding process expands the foam insulation around the studs forming one solid panel. The studs provide a structural attachment point to the substrate and for the specified finishes. For More Information:

Detail Drawings

Above-Grade Exteriors
Above-Grade Exteriors   pdf
CMU Above-Grade Exterior to Frost Line dxf pdf
CMU New Construction dxf pdf
Wood-Framed Above-Grade with Manufactured Stone dxf pdf
CMU Manufactured Stone Knee Wall dxf pdf
Wood-Framed Walls dxf pdf
Wood-Framed Walls, Over Existing Siding dxf pdf
Steel-Framed Walls dxf pdf
Exterior Wall Details
Exterior Wall Details, All     pdf
Wall Sections, All     pdf
Top of the Wall     pdf
InSoFast Vertical Wall Section  dwg  dfx pdf
InSoFast over 16″ O.C. Framing     pdf
InSoFast Over Sheet Foam dwg  dfx pdf
Exterior Corner Details
Inside Corners, All     pdf
Outside Corners, All     pdf
Foam Over 2x Backer dxf dwg pdf
Foam Under 2x Backer dxf dwg pdf
InSoFast No Backing dxf dwg pdf
ZipWall Backer Over Foam Board dxf dwg pdf
Zip Wall No Backer dxf dwg pdf
Foam Over Backer Stud dxf dwg pdf
Sheet Metal Backer dxf dwg pdf
Sheet Metal Strapping Backer dxf dwg pdf
InSoFast Over Additional Sheet Foam No Backer dxf dwg pdf
InSoFast With Additional Sheet Foam No Backing dxf   pdf
Inside Corner No Backing dxf dwg pdf
Inside Corner 2x Backer With Foam dxf dwg pdf
Exterior Window Details
Outset Windows, All     pdf
Inset Windows, All     pdf
Outset Window Sill Section  dxf dwg pdf
Outset Window Head Jamb Section  dxf dwg pdf
Outset Window Horizontal Section  dxf dwg pdf
Outset Window with 2×3 Framing Head Jamb Section  dxf dwg pdf
Outset Window with 2×3 Framing Horizontal Section  dxf dwg pdf
Outset Window with 2×3 Framing Sill Section  dxf dwg pdf
Inset Window Head Jamb Section  dxf dwg pdf
Inset Window Horizontal Section  dxf dwg pdf
Inset Window Sill Section  dxf dwg pdf

Comparisons, Brochures, and Guides

InSoFast Plus Method

Need a higher R-value? No Problem! Start with a base of InSoFast continuous insulation panels that are feature-rich and easy to install and then add rigid foam insulation over top of InSoFast panels.