Exterior Cement Board

Available variants

1 SKU · all share width 1220mm where applicable

Density 1–1.4 g/cm³ · Flexural strength ≥ 7 MPa (equilibrium)

Compliance & certifications

Test reports and assembly references available on request for AHJ submittal.

• IAPMO ER-360 — Evaluation Report (valid through 2026-07-31)
• ICC IBC 2015/2012 — Recognized alternative material
• ICC IRC 2015/2012 — Residential code compliant
• ASTM E-84 — Flame spread 0, smoke developed ≤5 (Class A)
• ASTM E-136 — Non-combustible
• NFPA 285 — Eligible (assembly-tested for >40ft)

Frequently asked questions

Common technical and specification questions for Exterior Cement Board.

• What does the IAPMO ER-360 evaluation report cover?+

  IAPMO ER-360 is the evaluation report that recognizes Plycem Exterior Cement Board as an alternative material under ICC IBC and IRC 2015/2012 codes. It documents acceptable wall-assembly designs, fastening details, and basecoat compatibility. The current ER-360 is valid through 2026-07-31; we provide it for AHJ submittal on request.

• Is this product eligible for NFPA 285 wall assemblies above 40 feet?+

  Yes — Plycem Exterior Cement Board is eligible for use in assembly-tested NFPA 285-compliant exterior wall systems on buildings greater than 40 feet in height. Eligibility depends on the complete assembly (sheathing, WRB, insulation, exterior finish). We can confirm assembly-level NFPA 285 documentation for your specific wall buildup.

• Is the panel Class A fire-rated and non-combustible?+

  Yes. It tests to ASTM E-84 Class A (flame spread 0, smoke developed ≤5) and is non-combustible per ASTM E-136. This makes it suitable for Type I and Type II construction and for exterior wall assemblies that must meet wildfire-region requirements.

• How is basecoat or stucco applied to the panel?+

  The fiber-glass mesh embedded on both faces of the panel provides a mechanical key for direct-applied basecoats, fiber-reinforced stucco systems, and acrylic finishes. Most exterior insulation finish system (EIFS) and Portland-cement plaster systems list this panel category as an approved substrate. Confirm specific compatibility with the finish manufacturer's technical specifications.

• Where is it typically used inside the building?+

  Interior applications include wet areas (bathrooms, kitchens, locker rooms), soffit cladding, and high-impact corridors. The panel resists humidity and water damage substantially better than gypsum wallboard, making it the preferred substrate behind tile in commercial wet environments.