Here all the preparation of the wall plates made sense . The first thing Darrell did was to lay out the floor plan on the floor . With a chalk line we snapped out the inward edge of the floor plate 5 1/2 inches in from the corners . All the other outer walls were similarly marked out by measuring from this datum . These were checked for square by the 3,4,5 Pythagoras method of determining a right angled triangle . Next the internal walls were marked on the floor , again by measurement and by consulting the plans . Then the sole and lower top plates were made and laid out in position with great care to ensure dimensional accuracy . each pair pinned together . With reference to the plans the windows and doors and their corresponding studs were marked out on both plates . Next came the joins between walls . Finally the basic studs at 16 " centers . Full length studs ( purchases as 92 3/8 to make 8' ceilings inc the three plates minus the ceiling thickness ) were marked with a