Original 5/8 in. Type X positioning with SCX UL designation per USG
Key features
Tapered long edges for Sheetrock joint treatment systems
Six-foot module for tight shafts and repair cuts with less scrap
Technical specifications
| R-Value | 0.56 |
|---|---|
| Thickness | 0.625 in |
| Width | 48.0 in |
| Length | 72.0 in |
| Coverage | 24.0 sq ft/pack |
| Material | Noncombustible gypsum core with recycled face and back papers (Firecode X per USG) |
| Fire rating | 5/8 in. Type X gypsum panel (UL Type SCX) per USG Firecode X; UL Classified for fire resistance where SCX is listed; edge marking on long edge per USG. |
| Sound rating | Acoustic performance is assembly-dependent; gypsum finish layers contribute to STC in tested partition assemblies (ASTM E90). |
| Density | Nominal 2.2 lb/sq ft per USG Firecode X specifications |
| Construction type | ASTM C1396 for 5/8 in. Type X gypsum wallboard per USG Firecode X |
| Application area | Interior walls and ceilings in UL-listed assemblies specifying SCX panels |
Product details
Shaft repairs, elevator openings, and furred-out chases often need Type X coverage without wasting full eight- or ten-foot sheets—six-foot Firecode X modules cut scrap dollars and simplify tight vertical lifts when the UL design allows the shorter module.
Each sheet covers twenty-four square feet; USG lists nominal 2.2 lb per square foot for standard Firecode X, roughly fifty-three pounds per sheet for crew planning—lighter EcoSmart lines use different nominal densities and UL types.
USG documents ASTM C1396 for five-eighths Type X gypsum wallboard, UL fire-resistance classification, GREENGUARD Gold, Moisture Resistance: No on the published performance table, and UL Type SCX printed on the long edge for matching to UL designs.
EcoSmart Firecode X carries ULIX, not SCX—never mix edge types in a listed assembly without engineer sign-off; crane picks and truck manifests must label bundles by UL type to avoid a Friday-afternoon substitution.
Finish with standard tapered-edge joint treatment compatible with Sheetrock systems; rated walls still need correct fastener spacing from the UL guide, not guesswork from residential experience.
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 fire and surface-burning classification per USG; ASTM C1396 Type X
Frequently asked questions
Is Firecode X the same as EcoSmart Firecode X?
Is Firecode X the same as EcoSmart Firecode X?
No. Standard Firecode X carries UL Type SCX per USG, while EcoSmart Firecode X uses UL Type ULIX—match the UL design to the printed type.
Can I use a 4x6 sheet in a one-hour UL wall?
Can I use a 4x6 sheet in a one-hour UL wall?
Only if the tested design allows that module and layer count; field cuts must preserve listing continuity and perimeter details.
Why is nominal weight higher than EcoSmart lines?
Why is nominal weight higher than EcoSmart lines?
USG lists 2.2 lb/sq ft for standard Firecode X versus 1.8 lb/sq ft for EcoSmart Firecode X—do not swap for crane picks without recalculating.
Does Moisture Resistance: No mean green board?
Does Moisture Resistance: No mean green board?
USG’s performance table lists Moisture Resistance: No for this SKU family page—select Mold Tough or other systems when enhanced moisture paper is required.