profiles

this shows the building profiles ,braced with pegs to keep it firmly in pace so the FFl measurement stays the same,the batter boards are nailed to the profile at the finished floor level,to find th FFL we use a dumpy level.
We level out the dumpy and look at each profile and use a stick with our datum height on it ,once this mark is lined up with the cross hairs in the level,the bottom of that stick is marked on the profile and that is our finished floor level.