If you re fortunate enough to have a pre existing concrete slab in your yard then you are already halfway to building extremely solid storage shed.
Building a garage on an existing concrete slab.
Cinder blocks are a great tool for building garden walls or storage structures in your yard.
Before you get started throwing up a shed on your concrete slab you ll need to give it a thorough inspection.
Figure 1 garage constructed on concrete pad.
Measure and mark on the existing concrete the points of your corners for your shed.
If the area where you are planning to use the cinder blocks is already covered with a concrete pad you can easily build a cinder block wall right on top of the concrete.
A 12 by 24 by 6 slab equals 7 41 cubic yards and will cost about 740 for concrete poured directly by a chute from a mixer truck.
From this red line measure in the width of the sill plate 4 inches if you are using 2 by 4s 6 inches for a 2 by 6.
The first step in building the garage foundation is pouring the concrete which costs 140 per cubic yard.
The type of fastener used to hold the building or structure to the pad is determined by whether the pad is in place or is to be poured.
Using a chalk line with red chalk snap a line that will mark the outside line of your shed.
Concrete pad to be poured figure 3.
Any structure that you build will be more stable when it is set on a solid foundation.
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The type of foundation or footings and slab you build your garage on will depend on your budget the size of the garage the grade and the soil conditions.