The ten decisions that shape an exterior envelope.

No decking-, wall- or soffit-specific exposure classification exists as something a client chooses between. The closest real precedent is an internal specialist-coordination scale used for soffit materials — fully sheltered through coastal/corrosive — but it's a trade-coordination document, not client-facing content. The one public exposure content is a general composite climate-risk illustration (heavy rain, humidity, termites, west sun, coastal salt) — real, but one illustrative graphic, not a graduated tool that changes which product a decking or cladding run may use. Ground and site conditions are assessed on site before anything here is actually specified.

Concrete battens, aluminium joists, galvanised steel and an approved-support-system ladder have no decision, scope line or catalogue row anywhere on the site. The scope registry's exterior pass has a line for the roof/awning/canopy and one for external drainage/gutters, but nothing at all for a raised deck's substructure — the model treats the exterior ground plane as slab-on-grade throughout, never as a timber-look deck standing on its own frame.

Floor finish — the one catalogue item that actually names a floor material — has exactly three options (SPC, porcelain tile, engineered timber) and none of them is WPC or an outdoor decking board; no other registry item names solid/hollow WPC, board width, groove pattern or a timber-look decking finish. The WPC product that does exist on the site is a wall-cladding product — citing it here would misstate what's actually offered underfoot.

Board gaps, deck slope, drainage outlets and a ventilated sub-deck cavity aren't addressed anywhere on the site. The closest adjacent content — the scope registry's external-drainage line and a façade-design register's rainwater choice — both describe roof and façade rainwater (gutters, downpipes, porch falls, wall flashings), not a raised deck's own drainage and underside ventilation. This is exactly the gap the rule about separating the visible WPC finish from the drainage layer beneath it is meant to close, and there's currently nothing in the system to quote from.

Wall panelling is a real, ALUMAX-supplied catalogue item — with its own product line and a named WPC wall-panel entry in the ecosystem contract — offering WPC, aluminium composite (flat panel) and fluted-profile options, plus its own live material comparison sheet. That sheet's room is a living-room TV feature wall, though; the WPC option's own usage text is what actually confirms exterior use (it clads both a feature wall and a sheltered facade), and the laminate option in the same item explicitly says it isn't for full exterior exposure. A true rainscreen — a drained, ventilated cavity system — does exist on the site, but it's explicitly scoped to commercial and shoplot aluminium facades, not a residential re-clad, so it can't be cited as covering the rainscreen option here.

A dedicated joint-pattern decision set is catalogued, but it isn't currently shown in the decision-sets gallery; a companion coverage set is withheld the same way. The only pattern-adjacent content actually visible today is folded into a material choice rather than a standalone comparison: the wall-panel item's fluted option is vertical fluting or slats, described for an interior feature wall. Horizontal, staggered, framed and shadow-gap joint treatments for an exterior WPC run aren't modelled anywhere on the site.

An internal façade-design specification document — not client-facing — has two entries that touch this question: one calls out aluminium trims, expansion joints, drip edges, sealants and wet-to-dry material junctions as the details to specify; another covers gutters, downpipes, porch falls and wall flashings. Between them they name flashing and joint detailing, but neither names a membrane, a drained cavity or a starter profile as its own item — the specific rainscreen-interface vocabulary this decision asks about isn't in the system anywhere; only this adjacent, internally-authored guidance is.

An internal specialist-coordination register names almost exactly this material menu — a WPC slatted ceiling, aluminium strip or clip-in, fibre-cement or calcium-silicate board, a folded aluminium composite panel, uPVC panels and more — each graded against an exposure scale from fully sheltered to coastal and corrosive. It's real and substantial, but it's written for the appointed specialist and ALUMAX/ELS to coordinate handoff against — a staff reference, not a decision a homeowner browses and picks from on this site.

The same internal soffit register's required fields include lighting, fan, CCTV and exhaust integration, and access panels for gutters, pipes, drivers and gate motors — real content, but staff-facing. On the public side, the scope registry does carry genuinely client-facing, priced options over similar ground: facade and landscape lighting, CCTV monitoring, and louvred or passive ventilation. These are real, live decisions — but they're general exterior-services choices, not modelled specifically as soffit integration, so a client can't yet configure lighting in a particular soffit as its own decision.

Stainless fixings, aluminium edge trims, a removable-board detail and a cleaning/maintenance plan for an exterior WPC run aren't named as a decision, scope line or catalogue item anywhere on the site. The nearest adjacent content is general coastal-hardware advice for a whole house — not decking- or cladding-specific — on one city landing page: specify salt-resistant aluminium finishes and stainless fixings before ordering any hardware.