DIY

Our screw foundations start from 210 DKK per screw. There are different screws in the range, so you can find the right screw for your project. See our dealers here.

Screw foundations are an alternative to a standard concrete foundation, requiring less time and effort as you just screw the screw into the ground and are ready to load immediately. This saves you time, as you normally have to dig into the ground to lay concrete and wait for it to dry. Read more about load capacity and how far down the screw should go for smaller DIY projects in the installation instructions here.

Screw foundations are often cheaper than traditional concrete. There are several factors that come into play, such as the bearing capacity of the soil, the strength of the material and the size of the project. However, it saves a lot of time and CO2, as with concrete foundations you have to dig and haul away expensive soil, mix, pour and wait for the concrete to be ready. With screw foundations, you can save up to 85% on CO2 and simply install the screw and it’s ready to load right away.

A screw foundation typically needs over 40 cm into the ground, depending on the type of soil you have. The screws must go into the sustainable soil layer. The best soil for foundations is clay, sand and gravel. We do not recommend founding our screws in soil and peat due to poor bearing capacity. Learn more by reading our installation guide here.

Depending on the type of soil you’re founding in, a screw foundation 70 cm into the ground can typically support 4.5 kN, which is equivalent to 450 kg. Per screw at optimal conditions. You can learn more about the load-bearing capacity at different depths and the type of soil you have in our installation guide.

You can install our screw foundations yourself. Installing the screws is easy as you can use our manual tools, which you can rent and buy in various DIY stores. However, we recommend that you use a Gearbox or impact wrench, which can be rented at several DIY stores. You can check out our installation guide, which includes a guide to various tools, how to install the screws and how far into the ground the screws should go.

You can easily install the screws into the ground using our hand tools or by renting a gearbox/impact wrench from several DIY stores. With our manual tool, you need to:

1. Mark the spot and drill by tapping the spear into the ground. (If the soil is very dry, you can pour some water into the hole.)
2. Screw the screw by hand until the tip of the screw is in the ground.
3. Screw the screw into the ground with tools until the desired depth is reached. Remember the spirit level.
4. If you are using an extendible screw, remember to attach the extension before screwing the screw further into the ground.

See the guide here for pictures and how to install the screws with a Gearbox (link).

When building on a screw foundation, it’s important that the screws are placed where the loads are. For example, under the joists of a terrace or at every fence post and gazebo. Take a closer look at our ground screw guide.

Screw foundations are a great sustainable alternative to concrete. With screw foundations, you save time, CO2, money and digging/towing work.

The screw foundation must be screwed into virgin soil. This means that once you have screwed the screw into the ground at an angle, the screw must be taken out and put in a new place. This is important as the screw must be able to compress the soil in the best possible way so that it stands firm.