ToughRock FireGuard X Mold Guard Moisture-Resistant Gypsum Board Drywall Panels
ToughRock Moisture-Resistant Drywall Gypsum Board
Moisture-Resistant Drywall Gypsum Board

ToughRock® Fireguard X® Mold-Guard™ Gypsum Board

  • 5 ⁄8” (15.9 mm) Classified Type X (as defined in ASTM C1396 and UL)
  • Moisture and mold-resistant treated facings1
  • Moisture-resistant1 treated, non-combustible core (when tested in accordance with ASTM E136)
A mold-resistant wall board ideal for high-humidity interior residential and commercial applications.

Manufactured to meet ASTM C1396 Section 7; CSA-A82.27-M and Federal Specifications SS-L-30D, Type VII Grade W, X, ToughRock® Fireguard X® Mold-Guard™ Gypsum Board is designed to provide extra protection against mold and mildew compared to traditional paper-faced gypsum board products. It has a Type X core (per ASTM C1396) and is UL classified Type X for use in a variety of fire-rated wood and steel-framed assemblies. When tested, as manufactured, per ASTM D3273 (“Standard Test Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber”), ToughRock Fireguard X Mold-Guard Gypsum Board achieved a score of 10 – the best possible score for this test.1

1The score of 10 in the ASTM D3273 test, indicates no mold growth in a 4-week controlled laboratory test. The mold resistance of any building product when used in actual job site conditions may not produce the same results as were achieved in the controlled, laboratory setting. No material can be considered mold proof. When properly used with good design, handling and construction practices, ToughRock® Mold-Guard™ Gypsum Board provides increased moisture and mold resistance compared to standard paper-faced wallboard products. However, the product is not intended for immersion in water or prolonged exposure to moisture. As with any building material, avoiding water exposure during handling, storage and installation, and after installation is complete, is the best way to avoid the formation of mold or mildew. Consult UL Fire Resistance Directory for assembly information.

*FIRE SAFETY CAUTION – Passing a fire test in a controlled laboratory setting and/or certifying or labeling a product as having a one-hour, two-hour, or any other fire resistance or protection rating and, therefore, as acceptable for use in certain fire rated assemblies/systems, does not mean that either a particular assembly/system incorporating the product, or any given piece of the product itself, will necessarily provide one-hour fire resistance, two-hour fire resistance, or any other specified fire resistance or protection in an actual fire. In the event of an actual fire, you should immediately take any and all actions necessary for your safety and the safety of others without regard for any fire rating of any product or assembly/system. For additional information concerning fire ratings and fire safety, visit our Product Fire, Safety and Use Information page.

Fire Resistance

Enhanced fire resistance – UL classified Type X

Moisture Resistance

Superior moisture resistance in high humidity interior areas


Physical Properties

nominal inches: 5/8” (15.9 mm) ± 1/64” (0.4 mm)


nominal: 4′ (1220 mm), 54″ (1372 mm)


standard: 8 ft. (2440 mm) – 14′ (4270 mm)


lbs/sq. ft. nominal (kg/m²): 2.3 (11.2)1

R Value

°F•ft2•hr/BTU (m2•K/W): 0. .56 est. (0.10)2

Humidified Deflection

5/8″ (16 mm)3

1Represents approximate weight for design and shipping purposes. Actual weight may vary depending on manufacturing location and other factors. 2Per Gypsum Association document GA-235. 3Specified minimum values are as defined in ASTM C1396.

GREENGUARD Gold Certification

Certifications may vary by production location, please contact local representative for more information.

Product Resources

3-Part Specs
Tech Guides
Safety Data

Product FAQs

Should gypsum board be installed vertically or horizontally?

While gypsum boards are stronger in one direction, they may be installed either vertically or horizontally on both wood and steel studs. If the boards are to be used in a fire rated assembly, then use the board orientation that is stated in your specific rated assembly.

What should we do if the gypsum board gets wet?
What is the fire rating of ToughRock® Fireguard X® Gypsum Board?
How often is a control joint required?

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