How to transfer points using a plumb-bob

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Transferring points from floor to ceiling

Step 1 – Mark point

If you are transferring a point from floor to ceiling, mark the point on the floor in the exact spot you want it. You may want to mark several points for a layout plan if you are installing an internal wall or door, or you may only want a single point, depending on your requirements.

Step 2 – Line up point

Line up the point of the plumb-bob with your marker. To help you steady it, allow the tip to touch the floor gently whilst taking the majority of the weight by holding the string.

Step 3 – Let out some string

Begin letting out a little more string whilst raising your hand upwards towards the ceiling, do your best to keep the plumb-bob stationary whilst you do this. If you have to ascend a ladder to reach your ceiling, it is advisable to have a partner hold the plumb-bob still.

Step 4 – Hold string

Hold the string to the ceiling in a position that is as close as possible to being exactly opposite your floor marker. If you are working on your own you will have to pin it there.

The string should be raised enough so that the plumb-bob can swing freely and rests 1.25cm (1/2 an inch) off the floor.

Step 5 – Allow plumb-bob to stop swinging

This should not take very long if you have kept the plumb-bob as still as possible whilst holding the string. To speed this up, have a partner hold it steady and then release it until it stops moving altogether.

Step 6 – Check alignment

Check to see if the point of your plumb-bob is aligned perfectly with your floor mark. If it is not, adjust the position of the string above and re-check until the plumb-bob and string are in perfect alignment.

Step 7 – Mark point on ceiling

Once your two points are aligned, mark the point on the ceiling for future reference. The line now running between these two points is exactly plumb. Job done!

Transferring a point from ceiling to floor

Step 1 – Mark point and attach string

Mark the point to be transferred from the ceiling to the floor and attach the string to it either by holding it there or by securing it with a pin.

Step 2 – Suspend plumb-bob

Suspend the plumb-bob by the string, allowing it to swing freely 1.25cm (1/2 an inch) off the ground.

Step 3 – Allow plumb-bob to stop swinging

Allow the plumb-bob to stop swinging. To speed this process up, steady the plumb-bob with your hand first, then release until it has stopped moving altogether.

Step 4 – Mark point

Once the plumb-bob has come to a dead stop, mark the point below the tip. Your two marks will now be directly opposite each other and the line between them should be exactly plumb.