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Having a hard time figuring out which products you need?

We’ll help you out with our little guide below!

You can also ask for specific advise form customercare@screwpilestore.com

HOW LONG SCREW PILES DO I NEED?

The application and soil quality defines the length of the screw pile.

Different applications demand different kinds of piles. The first principle is that the helical part is installed below the ground frost line (where this may happen). This way additional frost insulation won ́t be needed.

Another principle is that the pile must give sufficient load (compression) and lateral (sideways) support for the building. In all cases the installation depth should be at least 65cm. This is when a screw pile starts to have some lateral support.

Load: The Screw piles load bearing capacity has linear correlation to installation torque . The more the installation requires torque, the higher the load capacity is – and vice versa. To achieve a load bearing capacity of 1 000kg per pile (with safety factor F=2) the required installation torque is about 700Nm.

You can reach 700Nm when you need a force of 70kg to screw the pile with a lever 1m long.

(Or 35kg force with 2m long lever).

If the required load capacity / torque is not achieved then the pile should be extended with extension parts.

Below are some examples which pile sizes are the most common choices for each application:

TERRACES:

For terrace use the most common screw pile length is 1.20m, assuming that the terrace is built quite near the soil surface level (approx. 0-30cm from the ground). Using a longer screw pile is recommended if the construction level is significantly higher than that.

GARAGES / SHEDS:

For garage / shed applications the most common pile size is usually 1.70m.

There are occasions when the structure is very light and the 1.20m long screw pile will do as well.

Example calculation for needed piles

An example calculation for foundations for the terrace above:

Shopping list:

8 x Screwpiles ECO 1,2m

8 x L1 Bracket

Terrace size: 40m2

Price: 504,00€ (excl shipping)

Price/m2 for foundations 12,60€

Note:

The edge of the terrace can be anchored to the building itself, thus piles are needed only to support the middle part and the far end.

The pile used on most cases is the 1,20 m screwpile.

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