Boundary Wall Screw Piles in a Tree Protection Zone, SW London

In SW London, UKHelix installed 25 Finnish-made helical piles to support a new boundary wall at a smart new property. The catch was the location: the wall ran through a tree protection zone, where the ground around the roots could not be dug up or disturbed.

Screw piles are made for exactly this. Rather than excavate footings, UKHelix laid down a working platform, 100 mm of sand topped with two layers of 18 mm plywood, so the machine could work over the protected root area without harming it. Each pile went down to 4 metres with the torque monitored on site, and the pile heights were stepped to follow the slope of the path. The whole job was finished in a single day.

With no open excavation and the roots left undisturbed, the screw piles gave the new boundary wall a solid foundation while keeping the protected trees safe, and the whole job was wrapped up in a single day. Working around protected trees is exactly the kind of job UKHelix uses screw piles for.