5 benefits of micropile foundations
Like all builds, a sustainable structure needs the right foundation for long-term stability. Micropiles are a lower carbon alternative.
When constructing a low-carbon property, micropiles (a type of deep foundation) are a great alternative to more traditional options like concrete trench-fill foundations (a shallow foundation commonly used on small or domestic projects).
Micropiles (also known as minipiles) are piles with a small diameter of 100 to 250mm. They are essentially long, thin columns generally made from steel or reinforced concrete. Once they have been installed, a ground beam is placed on top for building on.
Let’s find out what advantages micropiling offers over concrete trench-fill foundations.
Micropile installation (Image: Franki Foundations)
Reasons to use micropiles
Lower carbon: A micropile foundation needs less concrete. For example, a typical single-storey rear extension using screw piles with concrete ground beams can result in a saving of 50% in terms of embodied carbon.
Less disturbance: Micropiles do not require as much ground excavation. This results in faster builds, requires less heavy machinery and also reduces impact (in terms of vibrations and noise) on the adjacent area.
Tree-proof: Roots can seriously compromise concrete foundations and therefore building stability, meaning trench footings sometimes need to be as deep as 2m. Micropiles, on the other hand, are not affected.
Great for complex sites: Micropiles can be easily installed (as close as 150mm) near to existing utilities, such as mains pipes. This avoids having to reroute utilities, which can be costly.
Happy neighbours: Piling is a less disruptive technique than concrete trench-fill foundations and similar options. This helps in resolving any sensitive party-wall issues.
In terms of financial cost, micropiling is more expensive than standard shallow concrete-trench footings. However, this price difference is reduced when deeper trench-fill foundations are needed.
Do you need foundation advice?
We can design a bespoke, low-carbon foundation solution for your project, and recommend tried-and-trusted piling contractors. If you would like to learn about sustainable footing options for eco-friendly builds, simply get in touch with us.
You can also read more about our alternative approach to sustainable structural engineering design that benefits people and planet, for stronger communities with a brighter future.
