Because I have not knocked the entire bungalow down and that I am starting at the lowest level of the plot I need to find the highest floor level so I can set it out properly. This has many advantages but mainly that I dont end up having the highest corner edge of the bungalow underground.
You can use a datum line for loads of things like setting out kitchens, bathrooms etc and it is very easy to do. Virtually all floors arent completely level so its not a good idea to use them as a level line so here is how to do your datum:
Measure a distance from the floor vertically to whatever height you want - I use 1500mm because I am short and its easier for me but you just pick your own. Once you have made a mark you can throw your tape measure back in the tool box and grab a spirit level. Using the mark and your spirit level draw a level line around the room or building (in my case).
This can be invaluable because if I hadnt marked the datum I would not have known that the bunglow rises by 30mm in the middle and drops about 75mm at the edge of the section I am working on - if I hadnt done this step then entire bungalow would be around 3" lower than where it should be. It doesnt sound much but do you fancy digging out 3" from 12 square metres all because you didnt follow this simple step?
See my posts later (much much later) about using a dutum for installing kitchen unitts)
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