Lightweight Mold Tough line at 1.35 lb/sq ft nominal density per USG
Key features
Moisture- and mold-resistant papers with moisture-resistant gypsum core per USG
Twelve-foot module to reduce horizontal joints on compatible wall heights
Technical specifications
| R-Value | 0.45 |
|---|---|
| Thickness | 0.5 in |
| Width | 48.0 in |
| Length | 144.0 in |
| Coverage | 48.0 sq ft/pack |
| Material | Moisture-resistant gypsum core with moisture- and mold-resistant recycled papers (UltraLight Mold Tough per USG) |
| Fire rating | Noncombustible gypsum core per typical gypsum-board listings; UL classification for surface-burning characteristics and noncombustibility per USG. Not a Type X (firecode) panel unless a separate Type X SKU is specified—verify UL design listings for rated assemblies. |
| Sound rating | Acoustic performance is assembly-dependent; gypsum finish layers contribute to STC in tested partition assemblies (ASTM E90). |
| Density | Nominal 1.35 lb/sq ft panel weight per USG Mold Tough UltraLight specifications |
| Construction type | ASTM C1396 for 1/2 in. water-resistant gypsum wallboard and related categories per USG Mold Tough UltraLight |
| Application area | Interior walls and ceilings where enhanced moisture and mold resistance is desired; follow USG installation guidance |
Product details
Twelve-foot Mold Tough is the seam-minimization play for tall, humidity-adjacent walls—think hotel wet walls, locker corridors, or tall utility chases—provided your crew can protect long edges through the building.
Forty-eight square feet per sheet at 1.35 lb per square foot nominal lands near sixty-five pounds nominal per USG—coordinate team lifts, corner guards, and laydown areas before the boom truck leaves.
The Mold Tough UltraLight certification bundle—ASTM C1396 water-resistant scope, ASTM D3273 references, UL classification, GREENGUARD Gold—should be copied into LEED-adjacent or school packages where low-emitting documentation is graded.
Do not confuse Mold Tough with a shower waterproofing layer; direct-spray zones still need assemblies proven for continuous water exposure.
For rated lines, edge-printed UL types must match the drawing schedule—never cover long panels until the inspector has confirmed the marking if the contract requires it.
Documents & certifications
Technical data sheet
Manufacturer-tested R-value, coverage, fire notes, and handling—use for submittals, RFIs, and field QA.
Download PDF (opens in new tab)Certifications & compliance
GREENGUARD Gold; UL classification (surface burning / noncombustibility per USG); ASTM C1396; ASTM D3273 mold-surface test per USG
Frequently asked questions
What makes Mold Tough different from standard UltraLight?
What makes Mold Tough different from standard UltraLight?
UltraLight Mold Tough pairs the lightweight 1.35 lb/sq ft class with moisture- and mold-resistant papers and a moisture-resistant core; USG cites ASTM D3273 and ASTM C1396 water-resistant board categories.
Is twelve-foot Mold Tough UltraLight harder to hang?
Is twelve-foot Mold Tough UltraLight harder to hang?
Long panels reduce seams but need clean lifts, straight stacks, and protected edges; follow USG handling guidance and jobsite logistics.
Can I use this as my only wet-area backer?
Can I use this as my only wet-area backer?
Wet walls still depend on membranes, flashing, and often cementitious backers in direct-wet zones—coordinate TCNA, USG details, and the AHJ.
Where do I confirm commodity code and UL markings?
Where do I confirm commodity code and UL markings?
Use the USG data/submittal sheet PDF and verify print marks on the panel edge; match purchase orders to the exact length and thickness shipped.