Interior Application

Simplicity Matters

Our products demonstrate a clear and simple approach to insulation and framing 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 can be less expensive. For more information about comparing InSoFast's value to traditional methods go to: Compare cost/value

FP-2.0RW (UX)


2.0, Flat Panel Details

dxf  pdf UX2.0 zip file

Panel Dimensions

24in × 48in × 2in

Horizontal Chase

48in × 1in × ¾in

Vertical Chase 24in × ¾in × ¾in


R-Value ASTM C518


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 Stud


Interlocking Edges


Cutting Indication Lines


Code Depth Raceways


Ready for Finishing






Moisture Control 

Channels on Back only


The FP-2.0RW (UX) is a 2″ thick closed-cell, injection-molded EPS foam panel that achieves R-8.5 insulation. The FP-2.0RW is our thinnest flat panel, optimized for flat surface interior finishing. The 2.0 flat panel will work on floors, walls, ceilings. It is a good choice as a sub-flooring base panel and for shipping container builds.

FP-2.5RW (EXi)

FP2.5RW Flat Panel Details
dfx dwg
FP 2.5RW zip file
InSoFast Interior Architectural Submittal pdf
Panel Body Dimensions 24in × 48in × 2½in
Horizontal Chase

 48in × 1in × ¾in

Vertical Chase

 24in × ¾in × ¾in

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

Service Raceways

Cutting Indication Lines

Designed Ready for Finishing Attachment

Interior (drywall, siding, etc)

Exterior Rated Moisture Control

ORSC, Section R703.1.1

Exterior Application

Interiors Application


The FP-2.5RW (EXi) is a 2 1/2″ thick closed-cell, injection-molded EPS foam panel that achieves R-10.5 insulation. The FP-2.5RW is our best flat panel, optimized for flat surface interior finishing. The 2.5 flat panel will work on floors, walls, ceilings. It is a good choice as a sub-flooring base panel and for shipping container builds.

UX2.0 Features

EXi 2.5 Features


Engineered Features

InSoFast panels offers an engineered system of continuous insulation perfectly suited for basement insulation. InSoFast panels remove the complexity of the project by providing a single step, a one trip to the wall finishing.

One panel-multi-function
Insulation-Framing-Vapor Retarder-Layout-Electrical Raceways
Simple Installation
Most jobs can be installed with little more than a hand saw, a utility knife, and a caulk gun.
Built-In Studs
Each panel is made with three high-strength co-polymer plastic studs that align every 16-in o.c. The back side of the studs feature a ribbed dovetails surface for adhesive applications against concrete, stone, metal or brick walls. The studs provide a solid surface that can support drywall attachment and cabinets or TVs. The studs are not prone to rot, decay, or moisture damage.
Self-Leveling Tongue-and-Groove Edges
The tight interlocking edges along each panel form a continuous, self-flashing seal. The interlock creates a resilient seal eliminating thermal leaks and prevents water from reaching the face.
Electrical Raceways built-in
Electrical raceways run vertically at 16” and horizontally at 24” o.c. This grid provides easy access to pull wiring to any location and is at code-approved depth.


Cool in the summer, warm in the winter. The continuous insulation keeps you comfortable in all seasons, all climates.
Healthy Choice
Specifically designed channels in the InSoFast body prevent moisture from getting trapped in your walls, move along, mold and mildew..
Moisture Control your wall stay dry
Built into the back of the UX and EXi panel is a network of drainage channels. The channels are specifically-sized cavities that direct moisture down the wall. The EPS foam of the panel features a permeability that ensures moisture is not trapped in your walls. Like Gortex or Tyvek, the panel allows the wall system “breathe”.
Saves Energy
Some of our customers have reported a significant reduction in their energy costs after installing our panels. Cut your bills or go off-grid. InSoFast projects qualify for a Federal Tax Credit up to $500.
Be Creative
Forget compromises. InSoFast supports any finishing option you can dream up. Put up pictures, install cabinets, hang a TV.
It is a better value and competitively priced

Will InSoFast work for me?

1Ed discusses why he invented InSoFast decades ago.
2What is the best and healthiest way to finish a basement?
We are of course but we recommend that you explore every possibility— stud walls, several types of panel systems and other types of insulation methods. All systems have their pros and cons like the complete modular panels are very expensive and bulky making them hard to maneuver into a tight basement. Traditional stud walls are a hassle in terms the extra work and the parts pieces and cuts you will have to make, let alone the process of taking all the materials down to the basement. InSoFast is Insulation-Framing-Vapor Retarder-Layout-Electrical Raceways in a 2' x 4' box of 40 square feet. Just 2 boxes is enough to do a 10' long 8' high wall.
3How do you insulate a basement that has a concrete brick form?

It is not a problem with InSoFast panels you will need about 15% more glue. You can also mechanically attach the panels with tapcon screws.

4What is the best insulation for basements?
Most foam insulation panels will work in a basement. The damp cold of a below-ground space requires insulation that will fight the development of mold and mildew while effectively protecting from heat loss. Basement building science agrees that it is important to choose an insulation panel that can dry to the inside. Expanded polystyrene like the foam that InSoFast uses has a perm rating that allows drying to the inside. NEVER use a fibrous insulation, like fiberglass it will allow cold surface condensation that will allow mold to develop.
5Will wood framed walls rot and cause problems in a basement?
They can. Wood studs will start to rot when their moisture content rise above 17%, this makes proper de-humidification essential when using wood framing. New alternative systems like, "InSoFast" panels provide built-in rot-resistant framing, raceways for wiring, and moisture control channels.
6Do the InSoFast Panel's meet Building Code Fireblocking Requirements?

No! It does not apply to InSoFast.

R302.11 Fireblocking shall be provided in wood-framed construction in the following locations: We are not wood or steel framed construction. Fireblocking is important. It is a confusing term and it is often miss-interpreted. The intent is to slow the progression of a fire so it does not rapidly jump from floor to floor or from room to room behind hidden spaces.

7Can I insulate an upstairs bedroom?

Yes you can. Most remodeling insulation projects involve intricate multiple step process: Not InSoFast. Traditionally you start with the tearing off drywall and installing the insulation in-between the framing. Anyone who has ever attempted a remodeling project like this can expect, Dust, Dirt, Noise and Disruption! Then once completed only 75% of the wall has been insulated. That means a R-13 wall is really only an effective R-10 assembly.  InSoFast's method delivers better results. InSoFast's low impact and highly effective method using continuous insulation updates and increases the comfort of any room in your home.

InSoFast Plus Method

Need a higher R-value? It’s easy to increase your R-Value beyond R-10 while maintaining the engineered benefits of the continuous InSoFast panels. Just start with a base of feature-rich InSoFast panels.