Deck

Available variants

2 SKUs · all share width 150mm where applicable

Density 1–1.3 kg/dm³ · Flexural strength ≥ 10 N/mm²

Compliance & certifications

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

• ASTM C1186-08 — Type A
• ISO 8336:2018 — Category A, Class 1, Level 1
• ASTM E-84 — Flame spread 0, smoke developed 0

Frequently asked questions

Common technical and specification questions for Deck.

• What is the maximum joist spacing for Plycem Deck planks?+

  Maximum 40.6 cm (16") on-center joist spacing. The 30mm (1-3/16") plank profile is engineered for this span under residential live-load conditions. For commercial applications with higher pedestrian loads, the design engineer should confirm joist spacing and connection details.

• Can the planks be painted, stained, or dyed?+

  Yes — the surface accepts paint, stain, and integral dye. Many specifiers prefer dyeing for a wood-tone finish that won't chip or peel. Use exterior-grade coatings rated for cementitious substrates; manufacturer technical bulletins list approved coating systems.

• How does the clip-based installation system work?+

  Planks are fastened to joists using hidden stainless-steel clips that engage grooves in the plank edges, leaving no exposed fasteners on the walking surface. This delivers a clean monolithic deck appearance and accommodates seasonal expansion/contraction without surface cracking. Clips are sold separately by the same manufacturer.

• How does fiber-cement deck compare to wood or composite for moisture resistance?+

  Fiber-cement is dimensionally stable in wet conditions and will not rot, warp, or harbor mold like wood, and will not soften under prolonged UV exposure like some wood-plastic composites. Density is 1.0–1.3 kg/dm³ and flexural strength is 10 N/mm² minimum — superior to most wood-composite decking products.

• How does this differ from Deck Modular?+

  Plycem Deck is a long-grain structural plank (150×3657mm) fastened to joists with hidden clips — it IS the structural floor of an outdoor deck. Plycem Deck Modular is a 300×300mm interlocking surface tile installed on top of an already-engineered substrate (concrete slab, OSB+membrane, pedestal pavers) — it is a finish, not a structural element. The same fiber-cement material, two different uses. Both share ASTM C1186 Type A and ASTM E-84 Class A. Choose plank when you are building the deck from joists up; choose Modular when you are finishing a rooftop terrace, balcony, or pool surround over an existing structural floor.

• What is the US code path for fiber-cement decking?+

  Wood and wood-plastic composite decking are prescriptively listed in IRC R507. Fiber-cement decking is not on that prescriptive list, so installations require approval from the local Authority Having Jurisdiction (AHJ) under IBC Section 104.11 "Alternative Materials, Design and Methods of Construction." JARA provides the manufacturer's ASTM C1186 + ASTM E-84 documentation needed for that approval. Best fit for coastal / mountain / commercial / multifamily amenity decks where fiber-cement durability outperforms composite or wood and the project team is willing to coordinate the alternative-materials submittal.