Multi Family Housing Structures Detail. 1- the construction will be carried out in rows from top to bottom.once the upper row is emptied, it will be possible to continue with the second row and so on. 2- build each row in the following order: a) 1st sections 1 b) then sections 2. c) finally sections 3- the concrete specified for calzas will have a f'c = 100 kg / cm2, and may carry coarse aggregate up to 3 "