•Set up tripod
•Set & level
•Find a benchmark
•Place grade Stick on benchmark
•Shoot grade stick to determine elevation above benchmark.
•Determine the height of your instrument (HI)
Start from a benchmark-Known elevation point + measurement on grade stick
IE: benchmark 4320 + 5.80 (decimal Stick)
Your HI= 4325.80
If your building datum elevation is 4320 (which is equal to level one finish floor)
then 4320= 100.
If your HI is 4325.80 this equals 105.80, so you are 5.80 above finish floor.
If you are trying to establish elevation, lets say 105.00 on core walls for reference. Then you would shoot a mark on the wall (this is level with your instrument) and measure .80 (9-9/16”) below the mark to be at elevation 105.00.
take me to Layout Part one
A cheap calculator and to know decimals is all you need to make elevation layout a breeze. (need inches to decimal converter: click here)