| Good early-stage fit | Primary terraces; Steps and thresholds; Garden paths; Pool surrounds with a verified finish | Contemporary terraces; Pool surrounds with a verified surface; Roof or pedestal systems; Precise modular layouts | Raised terraces; Indoor-outdoor thresholds; Poolside lounge zones with suitable boards; Roof terraces with verified structure |
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| Maintenance | Periodic care, system dependentJoints, organic growth and staining usually need attention. Sealing is not automatically required for every stone; follow the selected stone and installation-system guidance. | Generally straightforward surface careThe surface is commonly easy to clean, but grout, open joints, pedestal voids and edge details still collect debris or need inspection. | Timber and composite need different careTimber may weather, check or need a chosen finish renewed. Composite avoids some timber care but still needs cleaning and can retain marks, dirt or organic growth. |
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| Solar heat | Colour and density matterDark, dense stone in full sun can become uncomfortable underfoot. Compare full-size samples in representative sun; a pale colour alone does not prove thermal comfort. | Colour and exposure still matterDark porcelain can gain substantial heat in direct sun. Test a real sample outdoors and consider shade, footwear and barefoot circulation. | Board colour and formulation matterDark boards, including some composites, can become hot in sun. Compare samples under project conditions rather than assuming decking is cool. |
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| Wet use and grip | Finish must be verifiedA textured external finish can support grip, while polished or worn finishes may be unsuitable when wet. Confirm the specified product against the local wet-area test method. | Use the specified external classificationVisual texture is not proof of wet grip. Confirm the exact product and finish against the test or classification required for the project location and use. | Profile, cleaning and drainage affect gripWet boards and organic growth can reduce grip. Confirm the exact face profile, board direction, gaps and maintenance regime for barefoot or poolside use. |
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| Weathering | Varies by geology and exposurePorosity, salts, freeze-thaw exposure and staining sensitivity vary by stone. Check the actual source, batch and edge details rather than relying on the stone name alone. | Low porosity, but the assembly governs durabilityThe unit may resist water uptake, yet bedding, adhesives, supports, joints and edges can still fail under movement, frost, heat or poor drainage. | Movement and colour change are expected considerationsTimber responds to moisture and UV; composite boards also expand, contract and change appearance. Ventilation, spacing and manufacturer limits are essential. |
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| Drainage | Usually needs designed fallsStone units do not make a terrace permeable by themselves. Surface falls, joints, thresholds, drains and the base assembly determine how water is managed. | Falls, joints or pedestal gapsWater may run across a sloped bonded surface or through open joints to a drainage layer. The outlet, threshold and waterproofing strategy must be coordinated. | Water passes through gaps to the layer belowBoard gaps are not the whole drainage design. The substrate, membrane, joists, ventilation, outlets and access for cleaning must remain coordinated. |
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| Repair strategy | Individual units can be replacedLocal replacement is possible in many unit-paving layouts, but later batches may differ. Keep spare material and record the source, finish and thickness. | Unit replacement is possible with planningAccess depends on bonded versus pedestal installation. Store spare units because formats, print runs and tones can change. | Boards may be replaceableHidden fixings and access can complicate local replacement, and a new board may not match weathered material. Retain spare boards and fixing details. |
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| Installation focus | Base and bonding compatibility are criticalThickness, bedding or adhesive, movement joints, edge restraint, waterproofing and substrate preparation must suit the stone and local exposure. | Requires an exterior-rated complete systemConfirm paver thickness, substrate, adhesive or pedestal compatibility, edge support, movement joints, falls and handling of cut pieces. | Substructure controls the resultVerify structural capacity, joist spacing, ventilation, drainage, board-end clearance, compatible fixings, fire requirements and interfaces with doors or pools. |
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