J3 Engineering Group had the opportunity to work on a unique project providing engineering services for a 2,400 square foot cottage house 45 minutes northwest of Ann Arbor, MI. We worked with a geotechnical engineering consultant to design the foundation system for this three story house which includes a crawl space as well as a stand alone storage shed. The house and storage shed are both built into the side of a steep hill and the house is immediately adjacent to the lake.
The house was originally designed with a shallow foundation system. During construction additional geotechnical explorations indicated the need for a non-typical home foundation support system due to poor soil conditions. A deep foundation screw pile system with structural slabs and concrete beams were used to ensure stability of the house. The deep foundation system was required to be designed to withstand the additional lateral earth pressure and wind sliding force. Helical piers driven at an angle were used to resist these lateral forces applied to the cottage house foundation system.
The storage shed was also designed with a deep foundation system with structural slabs. The storage shed was built directly into the side of a steep hill so the full lateral earth pressure was resisted by battered helical piers.
In addition to the cottage house and storage shed, which J3 also helped engineer, the owner has built a 2 story boathouse and has plans to tear down his old house on top of the hill and will build a brand new home.