Homes “Lawn and Order” episode on HGTV recently featured Postech Screw Piles used for a large deck and for tie back of  a retaining wall. http://www.hgtv.ca/holmesmakesitright/video/season+2/lawn+and+order/video.html?v=2517023349&p=1&s=da&searchQuery=lawn%20and%20order#holmesmakesitright/video/search/lawn%20and%20order

36 Concrete footings under existing living spaces and decks were on unstable back fill and were all replaced with Postech Screw Piles. It was possible to install them under the existing building that was held up with scaffolding.