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Cork is the market's most durable natural insulator (50+ years). Made from cork oak bark (Quercus suber) — Morocco and Portugal are top two producers. Pure expanded cork is rot-proof, fire-resistant, hydrophobic, rodent-proof. Ideal for healthy living (babies, asthmatics).
Cork advantages: 100% bio-sourced, 50+ year life, humidity-proof (vs wool which loses 50% perf when damp), pest-proof, fully recyclable. Drawback: 2-3× more expensive. Choose cork for healthy homes, terraces, eco/passive builds.
Cork lambda 0.040 ≈ rock wool 0.038 at ~+5% thickness. Zones 1-3 (coast): 5-6 cm cork enough. Zones 4-5: 8 cm. Zone 6 (Ifrane, Midelt): 10-12 cm. For ETI facade: 4-6 cm suffice due to thermal inertia (cork buffers heat 4-6h in summer).
Pure expanded cork (no chemical binder): Euroclass E (combustible but no flames, doesn't spread fire, no toxic fumes unlike PSE). OK for housing except ERP cat 1. For ETI facades >18 m height: complement with rock wool firebreak bands per floor.
Same raw material (Quercus suber). Portugal: industrialized (Amorim global leader, ISO certified, uniform 110-130 kg/m³). Morocco: more artisanal, variable density 90-150, lacks certifications. Technical use (roof, ETI): prefer ACERMI-certified Amorim. Decorative: local OK.
Exterior ETI 4 cm (130 m² facade): 53,300 MAD. Roof 5 cm (150 m²): 34,500. Floor under-screed 3 cm: 22,500. Total: ~110,000 MAD. +35-50% vs rock wool. 30-year energy savings ROI: +25-40%.
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