Pickett_2017_17 PickettJ. 2017 17 wall building construction stone text Middle Ages Near East laying unjointed stone bricks in maximum low skill rate 250 bricks layed in 1 p-h p-h var2 / 250 brick var1 * 250 Data was converted from work days to person-hours. Author refers to 8 hour work days. Author distinguished two types of the bricklaying, unjointed and ordinary brickwork Author distinguised two skill rates, minimum and maximum low skill rate. He operates with addiontional +10% of labour as a high-skilled rate or labour under supervision. Only the height of bricks is mentioned which is 0,4m BuccellatiF. MarkoJ.26.4.2019