The MAX 3.75 interior/exterior insulation and framing panel. The Max 3.75 (R-Value 15.9) insulation panel is optimized for masonry or framed construction. Order 6 panels or 3 panels.
SKU: FP-3.75-6 (6 panels 48 sq-ft.)
At 3¾ in thickness, the MAX 3.75’s closed-cell, injection-molded EPS foam body achieves R-15.9 insulation.
EPS is a non-toxic, inert insulation that maintains its R-value throughout the life of your building. Because it does not absorb moisture like open-cell types of bead board, it is rated highly for below-grade applications like basements. The EPS body has a fire-retardant material and serves as a Class III vapor barrier.
Each panel is co-molded with three high-strength polypropylene studs that align every 16-in O.C. The anterior surfaces are fully embedded by a ½-in of insulation while the posterior surfaces feature ribbed dovetails for adhesive applications against interior concrete, stone, metal or brick walls.
They provide a straight surface that can support drywall attachment and exterior finishes as well as adornments like cabinets and TVs. They are not prone to moisture damage, and do not conduct heat along a wall system.
Four tightly interlocking edges along each panel form a continuous, self-flashing seal. Unlike traditional flashing tapes, the interlock create a resilient seal that will not change shape, dry or crack over time. The interlocks eliminate the potential for mistaken thermal leaks and prevent water from reaching the face. A notched alignment system ensures the panels and studs stay aligned during installation even when cut. Inset lines demarcate the location of wiring chases.
Built into the back of the MAX panel is a network of shingle-style capillary channels. The channels are specifically-sized cavities that moderate wall pressure so that both interior and exterior wall assemblies can drain and be allowed to remain dry. The EPS foam features a permeability that ensures moisture is not trapped in walls and, with help from the channels, will “breathe” through to be handled by any standard HVAC system.
Sealed electrical raceways runs vertically at 16 inches on center and horizontally at 24 inches on center.
This grid provides easy access to pull wiring to any location. Located at code-approved depth, the chases also provide the necessary separation from the drywall face to protect the wiring.
MAX 3.75 Insulated Flat Panel with Studs |
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FP-3.75 Panel Details | dfx – dwg – pdf |
FP-3.75 zip file | |
Architectural Submittal | |
Panel Dimensions | 24in × 48in × 3¾in |
Sealed Horizontal Chase 24″ o.c. |
48in × 1in × ¾in |
Sealed Vertical Chase 16″ o.c. |
24in × ¾in × ¾in |
Drainage Channel | 24in × ¼in × ¼in |
Coverage |
8 sq-ft |
R-Value ASTM C518 |
R-15.9 |
Outperforms |
2×4 Wall/R-20 Batts |
ASTM C578 Type II CAN/ULC S701 Type 2 |
Closed-Cell injection-molded EPS |
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) |
Recessed ½in below Surface |
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Interlocking Edges |
√ |
Service Raceways |
√ |
Cutting Indication Lines |
√ |
Designed Ready for Finishing Attachment |
Interior/Exterior |
Exterior Rated Moisture Control |
ORSC, Section R703.1.1-approved |
Exterior Application |
√ |
Interiors Application |
√ |
Walls | √ |
Floors | √ |
Ceilings | √ |
Commercial | √ |
Industrial | √ |
Educational | √ |
Foundations Walls | √ |
Shipping Containers | √ |
Tiny Houses | √ |
Passive House | √ |
LEED/Green Build | √ |
Interiors | √ |
Exterior | √ |
NFPA Assemblies | √ |
Estimating and ordering is simple measure the square feet of floor, wall, or ceiling surface that the project requires to complete the job. Divide the total square footage (xx) by 48 sq-ft. this will determine the number of boxes required for your project, (round up to the whole box count). Don’t overestimate.
Estimating adhesive has variables beyond our control, the condition of the wall, and how accurate the tradesmen is with a glue gun? The adhesive manufacturer’s technical sheet states, “A 3/8” (9.5 mm) bead extrudes approximately 38 ft. (12 m).“
To verify that enough adhesive is used, press the panel into place. Pull the panel back and check to see if the adhesive has spread out beyond the full width of the stud. It is normal for the panel to “float out” from the side of the wall when it is accommodating irregularities the adhesive will bridge gaps up to 3/8″.
LOCTITE® PL PREMIUM® POLYURETHANE CONSTRUCTION ADHESIVE Rough estimate for 28 ounce tubes of adhesive required |
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Square Feet | InSoFast Boxes | LOCTITE® PL PREMIUM®3x |
800′ | 20 | 16 |
1200′ | 30 | 24 |
2000′ | 50 | 40 |
3600′ | 90 | 72 |
Please read all the current Shipping, Purchasing & Returns *
Product Code |
Number of Parts |
Box Dimension |
Cubic Feet Per Box |
Weight Per Box |
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Length |
Width |
Height |
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MAX 3.75-6 |
6 Panels 48 SqFt |
23″ |
25″ |
49″ |
16.31 |
26 Lbs |
MAX 3.75-3 |
3 Panels 24 SqFt |
13″ |
25″ |
49″ |
9.25 |
16 Lbs |
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.