September 2019

National Gypsum Has You Covered for Fire, Sound and More

By Alan Zeedyk and Scott Hughes

Now it’s easier than ever to pair more tested assemblies with the best product portfolio for all your commercial projects. To meet your specifications, look no further than National Gypsum.

National Gypsum had a tremendous year in 2018, adding a record number of fire- and sound-related assemblies. NGC Testing Services in Buffalo, New York, facilitated all the testing.

Our new tested assemblies include:

Reduce Noise with New Sound-Proofing Innovations

Among our newest 50-plus tested sound assemblies, several feature our new ¾” SoundBreak XP Ceiling Board. These assemblies offer unprecedented 60+ IIC (Impact Installation Class) and 60+ STC (Sound Transmission Class) results with a single board. This acoustically enhanced ceiling board was specially engineered for floor-ceiling assemblies. It significantly reduces airborne and structure-borne sound transmission between adjacent spaces in commercial, multi-family and residential buildings.

Consider UL design M514, which offers a 1-hour unrestrained wood floor joist assembly rating.

Consider UL design M545, which offers a 1-hour unrestrained wood floor truss assembly rating.

For additional solutions to any acoustics challenge you face, watch for a new enhanced version of our popular The SoundBook™ – coming this fall. Contact your Construction Design Manager to reserve a copy.

More Fire-Rated Assemblies for All Your Designs

Our tested assemblies are third-party certified and code compliant for your critical commercial applications. We stay abreast of construction trends and incorporate them into our UL-rated assemblies, giving you one less thing to worry about.

Depending on your project, there are many options available. To highlight a few, we think you’ll appreciate these three “work horse” fire-rated assemblies:

  • V438 – 1-4 hour non-load bearing steel stud wall assemblies
  • W469 – 1-3 hour load-bearing steel stud wall assemblies
  • W419 – 1-4 hour shaftwall assemblies

Other Application Methods That Give You The Edge

Our MaX 12 is another innovation that reduces labor and eases installation. It offers the industry’s best 12” o.c. optimized fastener pattern applying to 1-hour, UL-rated assemblies that are single layer, metal frame (load-bearing and non-load-bearing walls). MaX 12 is now listed in 13 UL designs. And you won’t find this application method available with any other manufacturer’s products – it’s exclusive to National Gypsum.

When MaX 12 is coupled with Gold Bond® BRAND patented GridMarX® installation guide marks, contractors realize a substantial cost savings. You can’t beat the simple and efficient fastener pattern of MaX 12 and the precision that GridMarX provides. Together, they offer a powerful one-two punch, and contractors tell us they love it.

For Details, Talk with Your Construction Design Manager Today

Call or email your Construction Design Manager for more insights on the best sound and fire-rated assemblies to match your project requirements. Also, if you have additional questions about products, systems (MaX 12 or GridMarX) or want a second opinion, don’t hesitate to reach out. We’re here to help you design and build better.

"National Gypsum has you covered when it comes to Fire and Sound. Our two most popular resource books, The PURPLE Book® II and The SoundBook™, are expanding. With the addition of our UL and STC testing over the last 12 months, we now have some of the best resources in the industry. Let National Gypsum help you with those hard to find UL Designs, and we are here to help when sound transmission really matters."
- Scott Hughes

"National Gypsum has its own fire and sound testing facility, and that truly sets us apart as an industry leader. We recently added 15 new fire-rated systems and more than 50 sound assemblies to our library, giving our customers more of the best products and assemblies to complete all of their commercial construction projects."
- Alan Zeedyk

Product Overview

Gold Bond® BRAND eXP® Extended Exposure Sheathing Withstands The Elements

eXP® Sheathing provides superior weather resistance. If you need a moisture- and mold-resistant panel that can take on heat, humidity, rain and cold temperatures, eXP Sheathing is a great choice. Designed for attachment to the exterior wall and soffit framing, use it as a substrate for exterior cladding. eXP works well with many applications, including vinyl, wood and fiber cement siding as well as stucco, brick veneer and EIFS.

Advantages include:

  • Manufactured to meet ASTM C1177 (Standard Specification for Glass Mat Gypsum Substrate for Use As Sheathing).
  • Fire-resistant material with a non-combustible gypsum core helps protect framing elements, even when cladding is combustible.
  • Resists the growth of mold per ASTM D3273 with a score of 10, the best possible.
  • Offers a 12-month extended exposure warranty for typical weather conditions.
  • Provides superior water resistance without impeding vapor transmission.
  • Scores and snaps to exact size without sawing.
  • Dimensionally stable under changes in temperature and relative humidity: resists warping, rippling, buckling and sagging.
  • Coated fiberglass facers are easy to handle.
  • Easy to install with no special tools or fasteners required.
  • Features the GridMarX® guide marks for fast and accurate installation.
  • Suited for soffit and radius applications.

For more information or to explore whether it is appropriate for your application, talk with your Construction Design Manager.

All About Sheathing

We think you’ll enjoy reading these articles published in Walls & Ceilings by NGC associate Warren Barber. We guarantee you’ll learn something new!
W&C (March 2017) – Gypsum Sheathing for High-Performance Building (glass mat sheathing history)
W&C (April 2019) – Extended Exposure Meets Its Match

Project Profile

New European-Inspired Hotel

AC Marriott, Charlotte, North Carolina
LS3P Associates Ltd.
Barringer Construction

As growth in uptown Charlotte continues to surge, southern neighboring SouthPark is now being dubbed “the second downtown.” AC Marriott will help reinforce that vision. When completed, this new hotel will feature SouthPark’s first rooftop bar and 162-room “European-inspired” rooms on eight floors. Clad in stone, brick, tile and metal, it will blend with the area’s lush tree canopy while exuding metropolitan style. Many National Gypsum products were incorporated into this building – for details, visit the link below.

Read More About The Project

Continuing Education

It’s easy to fulfill some CEUs this summer. We recommend taking these continuing education courses:

Understanding UL Fire Resistant Directory 101
Gypsum 101

Testing Our Products

NGC products undergo fire testing for ASTM E119:

Watch Video


Amy Hockett
National Marketing Manager, Architectural Services & Sustainability

Pat Grotlisch

Frank Fuller

Alan Zeedyk
Gulf / Southeast

Thad Goodman
Central / Midwest

Scott Hughes
Northeast / Atlantic

Trang Schwartz
Architectural Specialist