Because the shed is designed to abut to another structure, the foundation need only be pressure-treated skids, the roof pitched in only one direction to shed water, and the back wall sheathed with 1/2-inch CDX plywood, which withstands indirect exposure to moisture. See Anatomy of an Outdoor Shed or Playhouse for more about typical shed construction.
The walls of the foundation have been created and the electrical is all set, now all that needs to be done is to fill the gaping hole in between them with limestone agrigate.  We also threw in some concrete paving stones that we had lying around because we don't plan on using them and we had already tried to give them away.  After the limestone is in place tamp it down by jumping on it and keep filling up any places that are no longer level.  After the entire base is filled with as much limestone as you can fit put a sprinkler on to soak it and set it for the next hour or so.  You may need to add a bit more limestone after this is done as well.
Before you exert effort in finding the woodworking company with the best shed plans, it is very important that you determine first the right type of shed that will suit your purpose. Now, aside from the purpose, there are other things to consider like the area where to put the shed (shed plans 12×16), the things that you will store in the shed, the appropriate building materials to use, the kind of environment or the weather in your place, and of course, safety issues. Will the shed be also used for the family’s recreational activities, or for workshops and meetings, or for some business ventures? Purchase shed plans because they can help in answering some of our important questions about this matter.
Since outdoor space is limited in a big city, everyone knows you must make smart use of vertical real estate. For a greenhouse/shed in San Francisco's Bernal Heights, Step 3 Studio designed in an open-framework structure that provides shelter for a garden shed that stores potting materials and plants on the ground floor. A steel staircase was built on site, which leads to a second level surfaced in steel grid mesh. The higher elevation is the perfect spot for container plants that require more sun. It's also a nice place to hang out and enjoy views of the city, day or night.
Omit the bird’s-mouth from four rafters and use these on the ends. Cut the 2x4s for the ridge and subfascia to length and mark the rafter positions on them. Line up the rafters with the marks and nail through the ridge and subfascia with 16d nails to secure them. When the roof frame is complete, line up the subfascia with the chalk line on the platform and tack it in three or four places with toe screws to hold the frame straight while you install the soffit.
You can build the walls on any flat surface, but the shed platform is ideal. Snap chalk lines on the plywood deck, 3-1/2 in. from the edges of the platform, to indicate the inside edge of the walls. Measure to make sure the lines are parallel and 89 in. apart. Then chalk a line down the center (Photo 1). You’ll use this line to make sure the angled top plates meet in the center.
The best spot for a shed is level, well-drained ground close to where you work in your garden or yard. The location doesn’t need to be perfectly flat; the foundation design shown in the plans allows for adjustments to make the floor level. Small sheds require only a top-of-soil foundation, even in locations with freezing winter temperatures. Precast concrete deck blocks work perfectly for this. 
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