Install Guide and FAQ

Ground Screw Installation Instructions

Click here to see the Ground Screw Installation video.

It is always advisable to scan for underground services before any installation.

Always wear appropriate PPE.

Once you have marked the position for installation we recommend you pre-drill a hole prior to installing your ground screw using a 16mm-25mm drill. Although this is not completely necessary it will help in 2 ways, firstly it will identify any obstructions that may be below ground such as large rocks and bricks which could hinder installation, and secondly pre-drilling will help to ensure installation is vertical as your ground screw will follow the line of the drilled hole. It is advisable to have a 2nd person at hand to help sight the drill to ensure it is vertical from a few metres away.

Start your ground screw by hand until it becomes too hard to turn.

Using the installation tool turn the ground screw into the ground using a little downward pressure to start. Once the ground screw has been inserted around 100mm it will begin to pull itself into the ground, less downward force is then necessary. Turn the installation tool until the ground screw is fully installed or until it becomes too difficult to turn. This will depend on ground conditions, in general, for most ground conditions, it is possible to turn the ground screw on your own until it is fully installed to ground level or desired level.

If the ground is particularly dry it may be necessary to have a 2nd person to help turn the installation tool. Each person should pull on either side of the handle until the ground screw is fully installed.

Top Tips

In drier conditions you can pour water in and around the ground screw prior to installation to soften ground. Wait a few minutes for water to disperse through the drain hole at the bottom of the ground screw, then install your ground screw. Only fill the ground screw once.

Unless you are tight against an obstruction and have no room to turn the installation tool handle, keep the handle in the centre of the tool . If extra force is required to turn the ground screw use 2 people to install as described above.

For every ¼ turn of the installation tool the ground screw will move 10mm further into the ground. You might find this information helpful if you are installing several ground screws that need to be level with each other.

750mm Ground Screw
Min / Max Installation Range: Ground level to 300mm above ground level.

550mm Ground Screw
Min / Max Installation Range: Ground level to 100mm above ground level.

Frequently Asked Questions.

Here are some common questions about our self-installation ground screws. If your query is not answered, please email us and we will endeavour to help you.

Are ground screws easy to install?
Yes, it takes less than 1 minute to install a ground screw. Click to see our Installation Video.

Are your ground screws strong and safe?
Yes. As they are installed, they compact the ground around them and become very stable.

How many ground screws do I need?
Please use our Ground Screw Calculator to determine how many screws you need. If you require further help please email us on: enquiries@groundscrewcentre.co.uk

How long are the self-install ground screws?
Each ground screw is 550mm or 750mm from top to point with +/- tolerance usually of 2%.

How many ground screws do I need to install my Shed/Summerhouse/Decking base/Log Cabin/Workshop?
Please use our Ground Screw Calculator to determine how many screws you need. If you require further help please email us on: enquiries@groundscrewcentre.co.uk

What weight will the ground screws withstand?
The 550mm ground screw will withstand up to 2.3KN (0.23 tonnes) and the 750mm ground screw will withstand 4.28KN (0.43 tonnes) of axial pressure depending on ground conditions. Please use our Ground Screw Calculator to determine the maximum weight supported.

If I’m building decking and I want to put a Hot Tub on top will I need extra ground screws?
Yes, it is advisable to give extra support under the hot tub, contact us with the spec of your hot tub and we will advise what extra you need.

Do ground screws hold water?
No, there is a drain hole at the bottom of each ground screw we supply.

Do ground screws rust?
No, they are completely galvanised.

What is the lead time for fitting if I choose this option at checkout?
We will contact when you order has been placed to discuss the fitting of your ground screws to arrange a suitable time with you and gain any additional information we might need prior to our visit to ensure everything runs smoothly.

Can I remove ground screws?
Yes, they can removed and relocated and re-used at any stage.

How far does the ground screw move with 1 revolution of the installation tool?
One revolution will install the ground screw 40mm further into the ground. Therefore, a quarter turn will be 10mm & a full turn will be 40mm.

Can I adjust the position of the fixing point when using ground screws for floor joists?
Yes, there is a handy adjusting bracket system which allows flexibility.

If I have a slope on my ground, but I need to install my Shed/Deck so it is level, can I leave some of the ground screw above ground level at one end?
Yes, for a 750mm ground screw, up to 300mm of the screw can be left proud and for a 550mm ground screw, 100mm of the screw can be left proud to help take up the fall of your ground.

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