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Bricks and blocks are manufactured locally throughout Morocco. Prices are stable with little variation, except for innovative blocks (thermopierre) which remain imported.
12.5 blocks of 20x20x40 cm per m2 of wall (with 1 cm joints). For a 10 m2 wall, count 125 blocks + 5-10% waste.
Hollow block is the standard in Morocco: economical, quick to lay. Red brick is more used for partitions and aesthetics. Thermopierre is the future (integrated insulation) but remains costly.
Yes, render is necessary to protect the block from weather and ensure waterproofing. Count 1.5-2 cm thickness, about 25-30 MAD/m2 supplied and applied.
Options: 1) Cavity wall with air gap (5-10 cm), 2) External insulation with polystyrene (EWI, 150-250 MAD/m2), 3) Use Ytong thermopierre (R = 2.5 m2.K/W vs 0.3 for block).
Mortar dosed at 350 kg/m3 of CPJ 45 (7 bags per m3 of mortar). For 1 m2 of block 20 wall: about 25-30 liters of mortar. Add plasticizer for workability.