EXPANDABLE HOMES
Pacific Isands Ready
Pacific-Grade Building Materials (Customisable Options)
What am I buying?
Customisable Materials List (20FT / 30FT / 40FT)
Below is a practical, supplier-friendly list of materials used across these projects that can be customised—either by grade, thickness, finish, certification level, or configuration—without changing the core expandable-home concept.
1) Structural Frame & Steelwork
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Square-tube steel frame (roof/base frame, primary chassis): steel grade (e.g., Q355B), tube sizes, wall thickness, reinforcement members
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Hot-dip galvanizing: coating mass/spec, post-galv sealing, edge treatment, touch-up system
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Secondary reinforcement: C-channel stiffeners, overlap plates, gussets, load-path hardware
2) Wall / Roof / Floor Panel Systems (Envelope)
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EPS sandwich panels: core thickness (50–75 mm), density, fire-retardant formulation, bond quality
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Steel skins for panels: sheet thickness (e.g., 0.5 mm), coating type, corrosion class, color finish
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Roof insulation layer: foam thickness (e.g., +20 mm), material type, placement strategy (thermal + condensation control)
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Roof cover sheets: thickness, coating, fastener system compatibility (cyclonic screws + washers)
3) Moisture / Fire / Termite Base Layers
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MGO (magnesium oxide) board (core layer underfloor): thickness, grade, edge sealing method
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Plywood layers (above/below MGO): thickness, marine grade option, anti-fungal treatment, formaldehyde class
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Floor finish layer: wood/laminate type, wear layer rating, moisture resistance, anti-slip finish for wet climates
4) Waterproofing & Sealing Materials (Critical for Pacific Sites)
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EPDM gaskets: profile shape, thickness, UV/salt durability
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Silicone / sealant system: marine-grade spec, cure type, adhesion primer, color
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Flashing & overlap plates (galvanized or stainless): thickness, width, fastener spacing
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Wet-area membrane system (bathroom): membrane type, corner banding, floor waste detailing
​5) Storm / Cyclone Upgrade Components (Connection Hardware)
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Hurricane straps / tie-down hardware: size (e.g., M12), quantity, material grade, anti-corrosion finish
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Cyclonic roof screws: class rating, screw diameter/length, washer type (EPDM), spacing schedule
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Diagonal bracing: stainless cable diameter, tensioning hardware, anchor plates
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Helical ground anchors: diameter, length, uplift rating, galvanizing spec, head connection detail
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6) Windows, Doors & Glazing
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Aluminium frames: standard vs marine-grade, thermal-break option, finish/coating
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Double-glazed units: glass thickness, tempered/laminated choice, Low‑E option, spacer type
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Fly screens: mesh grade, frame type, corrosion resistance
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Locks & hardware: multi-point locks, stainless hardware upgrade, cyclone-rated hardware sets
7) Rainwater Management
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Guttering: PVC vs marine-grade aluminium, thickness (e.g., 0.9 mm), brackets, downpipe size
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Downpipes & outlets: diameter, leaf-guard options, storm overflow detailing
8) Plumbing System Materials
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PPR water supply pipe: PN rating, wall thickness, UV protection, fitting brand/standard
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PVC drainage pipe: diameter upgrades (especially toilet waste), wall class (SN rating), long-sweep fittings
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Valves & fittings: isolation valves, unions for serviceability, trap types, floor wastes
9) Electrical & Safety Materials (Especially Important with EPS Panels)
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Cables: conductor size, insulation rating, moisture/heat performance class
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Conduit: flame-retardant conduit type, diameter, routing approach (serviceable vs buried)
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Junction boxes: waterproof IP-rated enclosures, glands, gaskets
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Protection devices: RCD/RCBO selection, surge protection option for island grids
10) Kitchen / Bathroom Fit-Out Materials
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Cabinet carcass material: moisture-resistant board types, edging, hardware grade
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Benchtops: stainless vs stone-look, thickness, edge profile
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Sanitary fixtures: tapware/shower sets, ceramic grade, corrosion resistance, easy-service traps
11) Exterior Finishes & Coatings
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Powder coating system (frames/railings): coating thickness, salt-spray rating, color palette
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Anti-corrosion topcoats: optional coastal enhancement layers on exposed steel components
