Skid foundation: a skid foundation is a simple and effective way to support the floor frame of a small shed. when it comes to time-tested building methods, its hard to beat a skid foundation. builders have been using this type of on-grade foundation to support outbuildings for more than three centuries.. Shed foundation options you can use. having a sturdy shed foundation that's built right is so important for the life of your shed. if not done properly, building your new shed will be a struggle. you will probably encounter everything from walls not lining up to roof sheeting not fitting properly.. The foundation is a very important part of building a garden shed. the emphasis should be on laying down a solid garden shed foundation and one which is not easily damaged by water. learn more about shed plans and building foundation from ryan henderson the author of my shed plans..