PLYCEM Product · Distributed by JARA International
Exterior Hidden Joint
Plycem Exterior Hidden Joint panels deliver a continuous monolithic facade finish with concealed joints, resistant to weather, insects, heat, and humidity. Available with tapered edge for premium surface finish. Installs on metal or wood structure.
Applications
- Exterior facade with monolithic finish
- Interior accent walls
- Commercial cladding
Available variants
8 SKUs · all share width 1219mm where applicable
| Thickness | Dimensions (W × L) | Weight | Edge profile | SKU | Panels / pallet |
|---|---|---|---|---|---|
| 8mm5/16" | 1219 × 2438 mm | 28.47 kg62.8 lb | — | 960018 | — |
| 8mm5/16" | 1219 × 2438 mm | 28.71 kg63.3 lb | — | 960019 | — |
| 8mm5/16" | 1200 × 2400 mm | 27.59 kg60.8 lb | — | 972234 | — |
| 10mm3/8" | 1219 × 2438 mm | 35.89 kg79.1 lb | — | 960093 | — |
| 10mm3/8" | 1219 × 3048 mm | 44.87 kg98.9 lb | — | 960096 | — |
| 11mm7/16" | 1219 × 2438 mm | 39.48 kg87 lb | — | 979441 | — |
| 12mm15/32" | 1219 × 2438 mm | 43.17 kg95.2 lb | — | 979422 | — |
| 14mm9/16" | 1219 × 2438 mm | 50.37 kg111 lb | — | 979423 | — |
Density 1.08–1.18 kg/dm³ · Flexural strength ≥ 7 N/mm²
Compliance & certifications
Test reports and assembly references available on request for AHJ submittal.
- ASTM C1186-08 — Type A, Grade I
- ISO 8336:2018 — Category A, Class 1, Level 1
- ASTM E-84 — Flame spread 0, smoke developed 0
No ICC-ES Evaluation Service Report — confirm AHJ acceptance
PLYCEM Exterior Hidden Joint is certified to ASTM C1186-08 Type A Grade I and ASTM E-84 Class A surface burning, but does NOT carry an ICC-ES Evaluation Service Report equivalent to James Hardie HardiePanel's ESR-2290 family. It is NOT documented to ASTM E-136 non-combustible, and is NOT listed for NFPA 285 assemblies. Suitable for residential and light-commercial facade cladding under 40 ft where the Authority Having Jurisdiction accepts manufacturer ASTM C1186 documentation directly, and for interior accent walls. Confirm AHJ acceptance before specifying for Type I/II construction, buildings above 40 ft (NFPA 285 required), or California Chapter 7A WUI zones.
Frequently asked questions
Common technical and specification questions for Exterior Hidden Joint.
When should I use a tapered edge versus a straight edge?
Tapered edge is specified for monolithic facade finishes where seams are filled with joint compound and feathered out for a continuous wall appearance. Straight edge is acceptable when the joint detail is intentionally visible (reveal-joint design). Both edge profiles share the same ASTM C1186 Type A Grade I classification.
What is the difference between this product and Exterior Cement Board?
Exterior Hidden Joint is a fiber-cement panel optimized for monolithic facade finishes with concealed joints — it ships with smooth surfaces ready to receive primer + paint or finish coatings. Exterior Cement Board is a Portland-cement panel reinforced with fiber-glass mesh on both faces, engineered for basecoat-and-skim wall systems (similar to plaster substrates). Choose Hidden Joint for paint-grade facades and Cement Board for stucco/basecoat systems.
What thicknesses are available and how do I select?
Eight variants span 8mm (5/16") through 14mm (9/16"). Thinner panels (8–10mm) are typical for interior accent walls and weight-sensitive applications. Mid-range (11–12mm) is the most-specified for exterior cladding. The 14mm variant is selected for high-impact zones, taller wall heights, or where additional stiffness is required. Width is consistently 1219mm (4 ft); lengths run 2438mm (8 ft) or 3048mm (10 ft).
Can it be installed on metal-stud or wood-stud framing?
Yes — both. Fastener type and spacing differ between metal and wood substrates; refer to the manufacturer fastening schedule (available on request) for screw size, edge distance, and panel-to-panel joint detail. The panel is suitable for ventilated rainscreen assemblies and direct-applied systems alike.
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Ready to spec fiber-cement panels for your project?
Talk to our sales line — available 24/7. We capture your project details and Robertson responds personally within 1 business day. Prefer email? Send us your specs.
Direct line: +1 (415) 933-5738 · robert@jarainternational.com