The inner tube of the prop can slide up and down freely.
Before you begin
Before you select the prop you’re going to use you need to consider the height that the prop needs to extend to and the weight it will need to support.
If you are supporting a material such as drywall, the weight of it will be clear at purchase (the average 48″ (122cm) drywall sheet weighs approximately 26kg (57lbs)).
If supporting a wall or ceiling, the weight you are supporting can be estimated by a structural engineer or there are many online calculators which can estimate the weight from aspects such as the floor supports, ceiling beams, roof rafters etc.
Using a support prop
When you know how high you need the prop to extend, you can secure it.
In lightweight adjustable support props this can be done by twisting the tube, or if using a steel prop, insert the pin into one of the holes on the inner tube.
Make sure the prop is tight between the floor and the surface that needs supporting. It is important that you use the correct size prop for the job and do not fill the gaps with loose timber as it is not stable.
The prop needed will depend on the height and weight of what needs supporting and each type of prop has different specifications.
Adjusting the height
Some lightweight adjustable support props are adjusted with a button that allows the prop to be extended. The button is then released to fix the prop in one of the defined hole positions.
Other lightweight adjustable support props have a spring based ratchet system which has a pistol grip lever to extend the prop. Squeezing the lever extends the prop.
This mechanism can be advantageous over props without the lever as they can be adjusted whilst already standing and do not have to be put up after the extension.
Extending an all-steel adjustable prop
Steel props can be adjusted by simply sliding the central tube out to the required height and inserting the steel pin into one of the holes.
The height can be slightly adjusted once the prop is vertical by turning the collar clockwise. This rotates the inner tube.