Im drawing up an existing building, and putting an extension on. What is the best way to place gridlines? Would 2 gridlines for the existing building suffice, and then just GLs for the new part? GLs are normally through structural elements-what if there are various wall types, eg stud frame, blockwork etc? Is there a standard that should always be used?
Lastly-for the gridlines relating to the existing building-would these still be placed as centre of structure? (will this be easily identified on site?)
Any advice/opinions most appreciated!