Structural | Electrical | Plumbing

Overview

This report is a technical due-diligence review of the EVOHAVEN system for the Australian market. It explains, in practical construction terms, the engineering and factory control already built into the product across structure, electrical, and plumbing — so that clients, builders, developers, and project partners can see exactly what sits behind the system.

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It has been prepared from EVOHAVEN project records including Project 029 technical and production controls, structural framing records, opening schedules, container certification data, concealed-services QA requirements, and installation specifications across the EVOHAVEN 20 ft platform.

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Where the project records provide actual specifications, those have been used. The relevant Australian compliance pathway has then been checked against public Australian authority and standards sources so the regulatory basis can be independently verified.

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1. Structural System and Compliance

Engineered from the base up

The EVOHAVEN structural system starts with a fully engineered steel base module built around a transportable container-format chassis.

The primary structural frame is Q355B high-strength steel with a minimum yield strength of 355 MPa. Principal base and corner members are 200 mm × 100 mm × 5 mm rectangular hollow sections, forming the ring beams and main corner-post structure.

That base frame is the structural datum for the entire module. It carries the floor framing, receives the wall framing, supports lifting loads through the corner casting system, and remains stable through factory handling, road transport, crane lifting, and sea freight.

This is not light decorative framing attached to a thin shell. The base structure is the main load path.

Module geometry

Overall envelope: 6058 mm × 2438 mm × 2896 mm. Floor plan dimensions: 6048 mm × 2428 mm.

Secondary framing includes external wall framing in 50 mm keels at 0.8 mm thickness, internal partitions in 75 mm keels at 0.8 mm thickness, and heavier 2.0 mm framing at toilet and opening zones where reinforcement is required.

The primary Q355 steel frame provides the main transport and global structural resistance. The cold-formed wall and roof framing completes the enclosure, supports linings and claddings, and reinforces openings and service zones.

This structural logic aligns with NCC structural intent for Class 1 buildings and the Australian design framework covering steel, cold-formed framing, and building actions — NCC Part H1, AS/NZS 1170.2, AS 4100, AS/NZS 4600.

Openings are engineered, not cut in

Window and door openings are dimensionally controlled and reinforced, with specific checks called up under the hold-point process before claddings and linings proceed.

Principal openings include a 1820 mm × 2200 mm sliding door, a 1820 mm × 1350 mm sliding window, and 656 mm × 1350 mm top-hung windows.

During production, sill, head, opening diagonals, and frame squareness are verified before glazing systems and finished joinery are installed. The structural opening governs door and window behaviour under wind loading and transport vibration.

Roof structure

The roof is steel-framed with formed falls for drainage — not flat-laid without thought to water management. Roof panels are galvanised corrugated steel sheeting, and structural roof members are tied back to the main steel skeleton.

The roof functions both as an enclosure and as part of the diaphragm behaviour of the module during handling and transport. Roof frame, wall frame, and base frame are inspected in sequence, with hold points requiring evidence before the next layer covers the structural work.

Material control

Q355B was specified because it provides dependable structural-grade steel with a nominal yield strength of 355 MPa — appropriate for a transportable modular base where strength, stiffness, and fabrication consistency matter.

The steel specification is tied to manufacturing control, dimensional checks, and coating requirements — not treated as a brochure item.

All steel is hot-dip galvanised, with anti-corrosion treatment applied to raw cut edges after fabrication. The steel grade and protection system are managed together.

Welding and fabrication

Welding is controlled as part of the same production system. The evidence register calls up weld photography and weld area inspection. Structural hold points include early document freeze, structural opening verification, pre-close-up review, and pre-shipment release.

Welds and frame joints are visually recorded and inspected before concealment.

Fabrication QA includes dimensional verification. Squareness is held to ±3 mm, checked using laser and spirit-level methods. Plane error is not more than 1 mm, and vertical error is not more than 2 mm in framed assemblies.

Welding practice is anchored to AS/NZS 1554 for structural steel welding.

Corrosion protection

All steel is hot-dip galvanised in line with AS/NZS 4680, using a zinc coating process applied after fabrication. Exposed raw edges created by cutting or drilling are re-treated with anti-corrosion compounds.

Additional protective coating layers are applied in service. This is a sensible sequence for an Australian modular product because the module must deal with factory handling, shipping exposure, cranage, transport vibration, installation, and long-term service.

Hot-dip galvanising is the primary corrosion barrier protecting the structural frame — especially in concealed zones, base members, and areas that may be difficult to access later.

Certified handling and transport performance

The module is documented as computationally verified for Category 5 cyclonic wind conditions.

CSC certification data records a maximum operating gross mass of 8,000 kg, a payload of 5,500 kg, a tare mass of 2,500 kg, an internal volume of 36.3 m³, and a transverse racking test force of 75,000 N. The same certification set records stacking performance at 1.8 g with a test load of 16,000 kg.

The base structural frame has been developed for a genuine transportable-duty load environment, not only a static residential one.

Lift and installation records show a four-point lifting arrangement, test-lift procedure, controlled lowering sequence, and a foundation system based on a 16-pad layout with 64 anchor bolts, concrete strength of at least 25 MPa, and close control of pad levels and bolt positions.

Factory QA

During production, we inspect steel identification, frame dimensions and diagonals, opening sizes, roof framing completion, coating condition, weld evidence, and final structural squareness.

Hold points are built into the sequence so structural work is checked before it becomes concealed by floors, wall linings, or cladding.

Structural compliance is not left to an end-of-line visual check. It is built through material selection, member sizing, fabrication control, welding review, galvanising, dimensional tolerance checks, and staged release through production.

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2. Electrical System and Compliance

Built for Australian and NZ supply from the factory

The EVOHAVEN electrical system is developed around an Australian single-phase service basis: 230/240 V, 50 Hz supply, with a weather-rated main distribution board and RCD-protected circuits.

Project 029 records confirm the module includes a switchboard with RCD protection, with RCD trip-time testing as part of commissioning. Electrical compliance is not treated as a later site task — the architecture is set up in factory production: incoming supply provision, switchboard location, protected internal rough-in, appliance and service points, and testing requirements are all identified before the unit leaves production.

Controlled service entry

The main electrical supply is not punched randomly through the external cladding. The incoming feed is left as controlled tails coiled and lashed to the module's steel base for final Australian site connection.

The same approach applies to air-conditioning power and refrigerant services, and TV/data tails. This preserves the external envelope during shipping, avoids vulnerable protrusions during transport, and gives the Australian installer clean control over final connection and certification.

Inside the module, all cables passing through steel studs are protected by rubber grommets or continuous conduit — a practical AS/NZS 3000 requirement once cables pass through metal framing.

Low-voltage and communications

Two CAT6 network cables and one TV coaxial cable run to the living-room ceiling cavity, terminating at a discrete 300 mm × 300 mm access panel. Services design is thought through at enclosure stage rather than as an afterthought, and access for future connection is retained without damaging finished linings.

Appliance and load coordination

The induction cooktop is model C23, a two-burner unit rated at 1800 W + 1200 W (3,000 W total), with dimensions of 288 mm × 510 mm × 80 mm and a required cut-out of 270 mm × 495 mm.

The bathroom ceiling heater is model 600-OY-3, rated at 2,400 W, with a fire-resistant aluminium fascia panel and dual copper motors, referenced to AS/NZS 60335.2.30:2023 and AS/NZS 60335.1:2020.

The exhaust fan is required to duct externally rather than discharge into a ceiling void. Hard-wired smoke alarms are included in the module in accordance with the residential NCC approach.

Earthing

The electrical specification identifies a bonded grounding arrangement using a minimum 16 mm² copper earth conductor to an earth stake driven at least 1.8 m, with a target earth resistance of less than 5 ohms, bonded back to the module frame.

Factory-installed internal wiring and distribution is then completed by final MEN/earthing verification and connection by a licensed electrician on site.

Pre-close-up inspection

Electrical installation work is inspected while wall and ceiling framing is still open. A pre-close-up services inspection hold point requires high-definition video of all wall and ceiling cavities before lining proceeds.

This covers cable routes, protection at stud penetrations, service locations, lighting circuit routing, and support arrangement for the ceiling heater. Permanent weatherproof labelling, switchboard completion, and final RCD trip-time testing are part of commissioning.

Concealed electrical work is only easy to verify once. We inspect it before insulation, plasterboard, and finished linings are installed over it.

Australian NZ compliance alignment

The electrical work is aligned to AS/NZS 3000. Wiring is structured around protected routes, mechanical protection through steel framing, identifiable switchboard distribution, RCD-based protection, wet-area coordination, hard-wired smoke alarms, and testing prior to release.

Final site connection and certification are part of the normal Australian pathway — particularly in Victoria, where licensed electrical work is supported by the Certificate of Electrical Safety process.

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3. Plumbing and Drainage Compliance

Serviceable by design

The EVOHAVEN plumbing design is a serviceable Australian-oriented system, not a sealed factory-only package. Internal plumbing is installed during factory production, with final site connections left in a controlled way for local completion.

The main water inlet is located behind the bathroom vanity, penetrating the external side panel in a managed position that avoids protrusions during shipping. Every penetration through the steel floor or envelope uses a PVC or metal sleeve, with cut steel edges treated against corrosion and sealed with high-grade polyurethane.

Serviceability, corrosion control, and envelope durability are considered together.

Water service layout

The recorded water service layout uses a 20 mm main supply inlet as the normal basis, with 25 mm identified as an option where source pressure is low or demand is higher.

The main cold-water trunk is recorded at 20 mm, with 15 mm branches to fixtures including the kitchen tap, bathroom basin, shower, and general appliance points. The toilet cistern connection is about 10 mm to 12 mm.

Hot-water distribution is recorded at 15 mm for both the main and branch lines, using pressure-rated hot-water pipe materials. The platform records identify PPR, PEX, and copper Type L as the principal pipe material options, with PPR and PEX used as the practical modular basis.

Operating pressure is recorded at a minimum of 200 kPa, with a recommended operating range of 300–400 kPa and a regulator required where the source exceeds 550 kPa.

Fixture-side connections

The kitchen sink is set up on 15 mm hot and cold supplies with a 40 mm waste and 50 mm trap arrangement. The bathroom basin uses 15 mm hot and cold supplies with a 40 mm waste. The shower uses 15 mm hot and cold supplies with a 50 mm waste. The toilet uses a smaller cold supply and a 100 mm sanitary waste connection.

Washing-machine and dishwasher points are also recorded in the 20 ft platform layout, each using 15 mm service connections with appropriate waste provisions where fitted.

Concealed plumbing QA requires exact measurement of the shower mixer, showerhead outlet, and vanity hot/cold supplies against cabinetry drawings before the walls are closed. Once lining and tiling go on, misalignment becomes expensive to correct.

Drainage

The main bathroom waste is recorded as 100 mm PVC. The kitchen sink drain is 50 mm, the basin waste is 40 mm, the shower waste is 50 mm, and the main sewer outlet is 100 mm.

The vent stack is recorded as a minimum 50 mm, with 75 mm preferred in some configurations, extending at least 300 mm above roof level. Drainage gradients are recorded at 1:50 for the sanitary lines, and supports are required at 1.2 m centres.

P-traps, cleanouts, and venting are part of the documented system rather than later additions. Australian plumbing compliance is built as much around pipe sizing, falls, support, venting, and access as around the visible fixtures — these hidden fundamentals are designed in from the start.

Wet-area control

Wet-area construction follows AS 3740 waterproofing practice with a multi-layer MAPEI membrane system, heavy-duty moisture-resistant fibre-cement substrate, bond-breaker tapes, and puddle-flange detailing.

Waterproofing directly supports plumbing compliance because it protects the penetrations, fixture zones, and waste points that pass through the wet-area floor and wall build-ups. The production sequence holds the wet area for inspection before tiling proceeds, and holds the service routing for review before any wall or ceiling cavity is closed.

Pressure testing

The water system is hydrostatically pressure tested to 500 kPa for not less than 4 hours, with a pressure drop of less than 10% as the acceptance threshold.

Testing includes gauge verification, leak inspection at joints and fittings, then flushing and functional flow checks at fixture outlets. Hold point HP-08 requires the routing, supports, and penetrations to be verified and photographed before concealment.

We test the plumbing while it is still visible. We do not close walls or ceilings over it first and hope for the best later.

Australian / NZ compliance pathway

The AS/NZS 3500 series is the main framework for water services, sanitary plumbing, sanitary drainage, and heated water services. Recorded pipe sizes, fixture branches, gradients, venting, support spacing, isolation, and testing philosophy fit naturally within that framework.

The WaterMark scheme applies — relevant plumbing and drainage product types must be WaterMark certified before installation, and installation must be carried out by a licensed plumbing practitioner.

EVOHAVEN is structured around clear service positions, conventional pipe sizing, accessible tails, and a normal licensed-plumber completion process.

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4. Technical Compliance Summary

The compliance work in EVOHAVEN is embedded in the product development and production process — not retrofitted to a generic finished module.

On the structural side, a real primary steel system is built around Q355B high-strength steel, 200 × 100 × 5 mm primary members, controlled framed openings, hot-dip galvanising, corrosion treatment to cut edges, and staged factory inspection of welds, diagonals, squareness, and structural hold points. The module carries documented transport and handling performance through its CSC certification and associated lifting, racking, and stacking data.

On the electrical side, the system is already oriented to the Australian supply basis of 230/240 V, 50 Hz single phase. Integrated switchboard distribution, RCD protection, protected cable routes through steel framing, hard-wired smoke alarms, identified appliance loads, communications cabling, earthing strategy, and pre-close-up electrical inspection. Factory work is complemented by the normal Australian final-connection and certification pathway through licensed electrical installation and statutory verification.

On the plumbing side, a conventional, buildable service layout uses recorded pipe sizes, controlled service entry, DN40/DN50/DN100 drainage geometry, venting, pressure ranges, hydrostatic testing, wet-area detailing, visible-service inspection before closure, and a service arrangement that suits licensed Australian final connection — framed around the WaterMark and AS/NZS 3500 environment that governs Australian installation.

Taken together, the compliance work in EVOHAVEN sits where it matters most — inside the system, before it is covered up.

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Key Standards Referenced

NCC 2022 — National Construction Code, Class 1a residential

AS/NZS 1170.2:2021 — Wind actions, Region D cyclonic rating

AS 4100:2020 — Steel structures

AS/NZS 4600 — Cold-formed steel structures

AS/NZS 1554.1 — Structural steel welding

AS/NZS 4680 — Hot-dip galvanised coating

AS/NZS 3000:2018 — Wiring Rules

AS/NZS 60335 — Appliance safety (cooktop, heater)

AS/NZS 3500 series — Plumbing and drainage

AS 3740:2021 — Waterproofing of domestic wet areas

ISO 9001 — Factory quality management

CSC Convention — Container Safety Convention

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EVOHAVEN — Premium Modular Accommodation

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