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Rmax Plus-3 3/4 in. x 4 ft. x 8 ft. R-5 Polyisocyanurate Rigid Foam Insulation Board

  • Eliminates thermal bridging for excellent insulation
  • Lightweight construction enables hassle-free installation
  • Features air- and water-resistive barrier for durable use
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Product Overview

For wall sheathing applications in new residential, commercial or agriculture buildings, the R-Matte Plus-3/Thermasheath-3 is a great solution. It is also for use in thermal retrofit construction to existing buildings. This rigid foam plastic thermal insulation board is composed of environmentally sound, closed cell, polyisocyanurate foam bonded to a durable white-matte (non-glare) aluminum facer and a reflective reinforced aluminum facer. This Energy Star qualified Rmatte Plus-3/Thermasheath-3 provides R5 with dimensions of .75 in. x 4 ft. x 8 ft. This product is designed for exterior and interior, non-structural uses.
  • Highest R-Value: thinner profile & higher R-Value than other foam boards
  • Continuous insulation: eliminates thermal bridging through the framing for improving thermal efficiency
  • Air & water-resistive barrier: preventing air infiltration and water intrusion
  • Radiant barrier: white on one side and reflective on the other for universal use
  • Exposure rated: can be used in attics/crawl spaces/interior walls
  • Easy to install: lightweight, durable and easy to handle

  • Click here to learn more about Eco Options and Energy Efficiency
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Additional Resources

From the Manufacturer

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Cover Area Per Bag (sq. ft.)0 ft²Coverage Area (sq. ft.)32 ft²
Product Length (ft.)8 ftProduct Thickness (in.)0.75 in
Product Width (in.)48 in


Compatible Install SurfaceCement,Existing Drywall,WoodFaced or UnfacedFaced
Insulation FeaturesFormaldehyde FreeInsulation Location2x4 Wall,2x6 Wall,Attic,Basement,Ceiling Insulation,Crawlspace,Exterior Sheathing,Garage,Re-Siding
Insulation R-ValueR5Insulation TypeFoam Board Insulation
Interior/ExteriorExteriorNumber of Pieces30
Pack Size30Product Weight (lb.)5.1 lb
Sheathing Size8 ft. x 0.75 in. x 48 in.Sheathing TypeISO

Warranty / Certifications

Warranty InformationStandard Manufacturers Warranty

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