Profiling

3.1.1        Explain using photograph’s, notes and sketches how you set out your house site using profiles.

Cover: datum height, profile pegs and boards, string lines, Builders dumpy level and laser level, how to level batter boards, squaring up the house footprint, checking diagonals, etc.

Builder’s Dumpy level

 How to set out your house site by using profiles is firstly you would need to locate the datum points and the boundary pegs to figure out your datum height, after it is located you will need a dumpy level to figure out the height that you will be working off, and then run a string line along the outside of the boundary pegs to mark out your site.

Boundary pegs

Position profiles 900mm -1mm from outside of the building lines or whatever it says on your plans.

After positioning the profile pegs, you will have to calculate the finished floor level from datum and transfer the finished floor level to the braced pegs.

Batter boards are then attached to the profile pegs according to the F.F.L; if it’s not levelled correctly it can throw your whole foundation off. leveling the batter boards you will need to check if the pegs are plum and level to the ground floor.

Once your batter boards are in place and leveled, you then hammer a nail on to your batter board. Sighting across to the next of your other batter boards, add nails on each end. Then run your string line down the length and the width to each corner of your batter boards. This will locate the corner of your foundation.

Rule a tape measure and measure the corner points of the string line diagonally corner to corner to whatever measurement that is required. You should then have the same measurements in both directions. If it’s not, you must then move both nails to the measurement of one end the same amount of space until you reach your square number.