a jack stud is any stud that is smaller then the original stud on the selected framing refer to the diagram below week six
TOP PLATE
is a horizontal timber member of the framing found at the top of the frame they are in junction with the studs
600 CENTRES
refers to the distance in which your studs must sit,so when your stud is introduced to the top plate the middle if the stud must be at 600mm.To get this 600mm you must first minus half the amount of the width of the wood and in this case we a re using 45x90mm so half of 45mm will be 22.5mm,you then take this 22.5mm and minus it from the 600 centres you started with giving you an answer of 577.5mm this will be your first measurement out form the edge and then from there on you simply measure 600mm till the timber is no longer
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