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1-brick allow angle of repose appliance arch basket weave batten bitumen blocks brickwork Building Regulations built cavity wall cement centre cladding clay coloured compacted construction curve damp-proof course depth distance drain edge ellipse ensure excavation external wall extrados face filling finish fireback fixed flaunching Flemish bond flue flue pipe gauge ground floor ground level hearth heat height holes horizontal inspection chamber insulating key brick kN/m laid layer laying length less lintel load marked material maximum metres mineral wool mortar offset opening panel pier pitch fibre pipes placed plinth Portland cement prevent reinforced concrete rods roof sand scaffold screed shape showing side slab soffit solid square stairway steel steps straightedge striking point strip foundations structure struts suitable supported surface template tiles timber tion trammel tread trench trowel tumbling-in type of soil ventilation vertical voussoirs wall Figure width