Any structure that you build will be more stable when it is set on a solid foundation.
Building a garage on an existing concrete slab.
Figure 1 garage constructed on concrete pad.
Cinder blocks are a great tool for building garden walls or storage structures in your yard.
I would use a concrete saw to cut out two foot by two foot squares at each column location remove the concrete auger holes as appropriately designed by the building engineer set the columns in the hole per the plans then form and fill with premix around the top of the column to complete the slab.
Figure 2 l concrete foundation anchor bolt.
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.
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.
Before you get started throwing up a shed on your concrete slab you ll need to give it a thorough inspection.
Concrete pad to be poured figure 3.
Using a chalk line with red chalk snap a line that will mark the outside line of your shed.
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.
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.
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Measure and mark on the existing concrete the points of your corners for your shed.
Pouring just a slab with a thickened perimeter is the least expensive and a perfectly acceptable option if you have good soil conditions not spongy.