CI Max Foam Sheathing

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Designed for easy installation in exposed interiors, Johns Manville CI Max® Polysio Foam Sheathing Board is ideal for places where high efficiency is required.

Johns Manville CI Max® Polyiso Foam Sheathing Board is available in R-Values up to R-26 and provides a continuous layer of insulation to reduce thermal bridging and improve energy efficiency. CI Max sheathing is designed for exposed interior applications and is approved for use without a thermal barrier. It is suitable for wall or ceiling applications in residential, commercial, agricultural and industrial buildings. 

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Thermally Efficient: Effective resistance to heat transfer, with R-values up to R-26.
Vapor Barrier: Maintains a minimum thickness of one inch and qualifies as a Class I vapor retarder.
Lightweight: Easy to handle and may be cut with a utility knife or saw.

  ASTM Standards   ASTM C1289   Type I, Class 1
  Flame Spread   ASTM E84   4": ≤ 25
  Smoke Development   ASTM E84   ≤ 450
  Water Vapor Transmission   ASTM E96   0.02 perms (1.4 ng/Pa-s-m2)
  Compressive Strength   ASTM D1621   ≥ 16 psi (110 kPa)
  Water Absorption   ASTM C209   < 0.6% volume
  Service Temperature      -100 to 250°F
  R-Value Per Inch     6.0

Data Sheet
CI Max Foam Sheathing Data Sheet


CI Max Foam Sheathing SDS
CI Max Foam Sheathing SDS (ES)



AP Foil and CI Max 20 Year Limited Warranty

Product Selector Guide
PIMA Performance Bulletin - Polyiso vs. XPS
JM All-Purpose Wall System Components Sheet


evaluation reports


JM CI Max Guide Specifications in CSI Format
JM Continuous Insulation Wall System Specification, Section 072100 - Foil Faced Rigid Insulation

JM Foam Board Video

JM Continuous Insulation Video

JM Overview Video

Polyiso Continuous Insulation Wall Systems: The Perfect Wall

Available Documents