Product Descriptive Name
High-Density Perlite-Based Cover Board 
Product Short Description
JM FESCO Board HD is a high-density, protective, perlite-based cover board or low-thermal insulation board proven to reduce blistering in hot-asphalt applications.

Product Details


Product Long Description




Meets the requirements of ASTM C 728, Type 2

TopLoc® Coating: Top surface is sealed with this special coating to reduce excessive asphalt absorption in hot-asphalt applied roofing systems

Expanded Perlite: Provides good dimensional stability, excellent insulation value with stable R-value and superior fire resistance.

Reinforcing Cellulosic Fibers: Consists of recycled newsprint to provide strength to the board as well as high recycled content. JM utilizes third party certification by UL environment to certify the recycled content and contributes to the LEED Materials and

High Density: Allows for installations directly over a wide flute or metal deck application for spans up to 2½" and resists damage from construction and maintenance.

Hot Asphalt Friendly: Can be used as a cover board in re-roofing and new construction, proven to reduce the tendency for blistering in hot asphalt applications.



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Johns Manville offers one of the most comprehensive portfolios of commercial low-slope roofing solutions. We have a long standing dedication to providing solution-based systems for building owners.

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Here you will find quick links and cheat sheets to Johns Manville roofing systems code approvals and ratings. 

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Support services can include: conceptual product information, building science, wind uplift data, national and local code understanding, FM Global® and UL® regulations, fastening patterns and sheet layouts, installation guidelines and standard details.

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Re-roofing mechanically attached or ballasted insulated single-ply systems now have the potential for recycling versus contributing to a landfill.

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