Johns Manville CI Max™ foam sheathing board is designed for exposed interior use, made from a uniform closed-cell polyisocyanurate foam core bonded on each side to a printed foil and glass mat facer.
• Thermal efficiency – polyisocyanurate foam provides a high degree of insulation efficiency, resisting heat transfer with R-values up to R-25 (RSI-4.40 at 4" thick). It reduces thermal bridging at framing members, improving the overall thermal efficiency of walls.
• Noncorrosive – does not accelerate corrosion of pipes, wiring
or metal studs.
• Lightweight – easy to handle, can be cut with a utility knife or saw.