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Securock® Brand UltraLight Glass-Mat Roof Board

High-performance UltraLight roof boards for mechanically attached systems that are resistant to fire, mold and mildew. Easy to cut, handle and install.


Easy to cut, handle and install, high-performance glass-mat roof boards that are resistant to fire, mold and mildew.
Securock® Brand UltraLight Glass-Mat Roof Board is a high-performance roof board for use in low-slope commercial roofing systems. The specially treated core and high-performance glass-mat facer provide protection against fire, mold and moisture, while high-quality mat produces less itchiness than competitive products. Securock® Brand UltraLight Glass-Mat Roof Board scores and snaps cleanly and easily, making installation a breeze.

Main Features

Enhance the durability of the entire roofing system by using cover board in single-ply mechanically attached systems.
  • Ideal for use as cover board in single-ply mechanically attached systems
  • Lightweight core; up to 18% lighter than competitive products*
  • Moisture and mold resistant core and facer
  • Provides protection to roof system from hail and foot traffic
  • Fire resistant for use as fire barrier and thermal barrier
  • Unmatched mat-to-core tensile bond strength makes facer less likely to delaminate when cutting
  • High-quality tight mat makes for easier handling and cutting
*Lightweight applies to 1/2" and 5/8" thickness only.


  • Bars Restaurants and Dining Areas
  • Department Stores and Boutiques
  • Grocery Stores
  • Health and Fitness
  • Multi-Family Residential and Condos
  • Warehouses

Documents & Files

Data/Submittal Sheets & Specifications

Data/Submittal Sheet (English) PDF 508.4 KB
Architectural Specification (English)

White Papers

White Paper (English) PDF 456.3 KB

Catalogs & Brochures

Brochure (English)

Project Profiles

Project Profiles (English) PDF 1.4 MB

Installation & Technical Manuals

Technical Guide (English)
Installation Guide (English) PDF 753.1 KB

SDS, Certifications & Reports

SDS (English)
SDS (Spanish)


Warranties (English) PDF 168.9 KB

Ask a question

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Question Guidlines

  • Questions should relate to this product specifically.
  • For help with pricing, availability, or delivery, please call 800.874.4968 (Monday–Friday, 7am–6pm Central)
  • All questions and answers follow USG’s Terms & Conditions.
  • Your question and USG’s answer may be posted to this page in the future, but none of your personal info will be included.

q & a

  • How many fasteners should be used with Securock® Roof Boards?

    Always refer to a roof design professional and/or FM for the amount of fasteners. We have a fastener pattern sheet that can help you with the placement of fasteners.

  • Where can I find information on handling Securock® Gypsum-Fiber?

    There is a tip sheet for Securock® Gypsum-Fiber that can be found on the product page with a literature reference number RF-18.

  • Do I need special tools to cut Securock® Roof Boards?

    No, Securock® Roof Boards will cut with ordinary utility knifes using a score an snap method. For thicker boards like Securock 1/2" Gypsum-Fiber, two scores will be necessary. For 5/8" Securock Gypsum-Fiber a tool such as a circular saw will be necessary. It is highly recommended that a wet or dry vacuum be attached to the circular saw to reduce the dust and that the person cutting Securock Roof Boards and those in the vicinity of the cut wear a NIOSH approved dust mask.

  • Where can I get installation assistance for Securock® Roof Boards?

    We have a great Securock® Roofing Team that can help you out with your project wherever it is. Please email and someone will assist you.

  • Are there SDS files for Securock® Roof Boards?

    SDS files can be found on the product literature page.

  • What sizes do Securock® Roof Boards come in?

    Securock® Ultralight Glass-Mat Roof Board comes in 1/4" 4x8, 1/2" 4x8, and 5/8" 4x8.

    Securock® Cement Roof Board comes in 1/2" 4x8.

    Securock® Gypsum-Fiber comes in 1/4", 3/8", 1/2", 5/8" thickness; 4x4 and 4x8 width/lengths; and there are half pallet options too.

  • Who can I contact for help with my Securock® Roof Board project?

    We have a great Securock® Roofing Team that can help you out with your project wherever it is. Please email and someone will assist you.

  • What are Securock® Roof Boards?

    Securock® Roof Boards are a portfolio of high performance roof boards to meet the needs of your low slope commercial roofing project. Each type of roof board is uniquely designed to help protect your roof when used as a fire barrier, thermal barrier, coverboard, recoverboard, or parapet wall.

  • Where can I buy Securock® Roof Boards?

    Stocking distributors of Securock® Roof Boards can be found on the "Where To Buy" page.

  • Where can I find all the fire-rated UL assemblies for Securock® Roof Boards?

    Please refer to UL's database for specific UL information, we also have information for UL on

  • Where can I get information on how to install Securock® Roof Boards?

    The “Installation and Application Guides” for Securock® Roof Boards are available on the product infromation site.

  • What are the physical and mechanical properties of Securock® Roof Boards?

    The physical and mechanical properties of Securock® Roof Boards can be found in the submittal sheets on the product infromation pages.

  • Have a question?

    Let us do the research. We'll get back to you as quickly as we can.

    Ask USG
  • Need help right away?

    Call our Technical Support team at 800-874-4968 (Monday-Friday, 7am-6pm Central).