Screw piles are an engineering technique that has evolved over centuries. As long as man has built structures he has needed to support them - during initial construction or when structures later require repair or improvement. Modern screw piles add another versatile and cost-effective tool to the civil engineer's toolkit. Screw piles are also called helical piles. Screw Pile is an engineering technique. Screw piles are manufactured using varying sizes of hollow sections. This technique has developed over many years and centuries ago. These are needed to support structures during the starting point of the construction. They are also used when structures are completed or during the repair or improvement in current designs. Screw piles are wound into the ground much like a screw into wood. Incorrect techniques are likely to result in overall poor performance. Screw piles turned into the ground, much like a screw is turned into wood.
Screw Piles can be removed, moved and reused. Unlike traditional dug-in basements, Screw Piles are minimally damaging to the landscape and can be removed cleanly and reused if the building is demolished. There's no limit to where Screw Piles can be used. They are installed below the frost line and can be installed in any condition, except for frost.
A spokesperson at Zak's Building explained, “Screw Piles are quicker and easier to install than traditional concrete footings or foundations. This means lower costs and less downtime waiting for foundations to be poured and inspected”.
It’s quite hard; to sum up, what Zak's Building is in just a few words. Sturdy and resistant to frost and water damage, Screw Piles provide excellent building foundations in the long term, even through building expansion or additions

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http://zaksbuilding.com/Saskatchewan-Construction/Screw-Piles