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The blocks measure 8 in. wide by 16 in. long and come in 4-in.- and 2-in.-thick units. The thicker blocks are placed first, with the thinner “patio” blocks laid on top when you need to raise one block even with the others. In some cases, you may need to stack two or three 4-in. blocks on top of each other to raise the lowest corner of the foundation so it is even with the highest corner.

I am planning to build a 20 X 16 shed in my yard in Brandon, FL. I want to be able to pull my truck in to work on it at times. I will be putting it on a Wood deck platform. What it the best ideas for weight support for the 5K Lb. truck? IE: 2X6s, 2X8s what type f spacing is best and which direction should the joists be going in reference to the roll up door? And help would be appreciated.
Once the concrete has cured, set a post on top of the footer. Use the intersection of the mason's string to set the post square. Making sure the post is plumb — and holding it straight — add concrete around the sides and cover with soil. Brace each post to keep it in position while the concrete sets. Watch our video How Do I Set a Post in Concrete? for an illustration of bracing.
Complete the siding, then remove the toe-screws and move the wall aside to make room for constructing the opposite wall. Use the same chalk line template and process to build the opposite end wall. Figure C (in Additional Information below) shows framing details for the front wall. Mark the curves on the 2×10 header pieces using the trammel setup shown in Photo 12 and Figure G (in Additional Information below). Cut them with a jigsaw. When you’re done building the front and back walls, set them aside so you can use the platform to build the roof sections.
These sheds are perfect for small yards where space is scarce. If you plan on storing large items inside, make sure to install double doors. On the other hand, if you want to design it like a very small office, one door is enough. Lean-to sheds are generally used for storing tools like nails, screws, electric drills, gardening equipment etc., basically anything that fits. Lean-to sheds can be placed in close proximity to your house or other existing structure.
Door placement is also important. You often see doors placed on the gable end of the building, which looks nice, but makes it virtually impossible to reach items stored at the rear of the shed. A better alternative is to put the door on the long side wall, so that you'll be able to access items to the right, left and back. Another option is to install doors on both gable-end walls, so that you'll be able to easily reach items from either end of the shed.

Using wooden pegs and string, mark out the desired base size adding 2" to each length, for example: for an 8x6 base you would need to string mark 8'2"x6'2". Measure from corner to corner to ensure the area marked out is square. The concrete base cna be level with the surrounding soil or raised above. If you require a level with the ground base you need to excavate the area to a depth of around 6" to allow for 3" of hardcore/sub-base and 3" of concrete. Level the area with a rake and remove the pegs and string. 
Cut the treated 6x6s to 12 ft. and set them on the gravel so they’re parallel and the outside edges are 6 ft. apart. On sloped ground, you’ll have to raise the 6×6 on the low side until it’s level with the adjacent 6×6. Do this by stacking treated 2x6s, 4x6s or 6x6s on top of the treated 6×6 to reach the right height. Use a 4-ft. or longer level to make sure the 6x6s are level and level with each other. Finally, square the 6x6s by adjusting the position of one 6×6. Slide the 6×6 back and forth, not sideways, until the diagonal measurements from opposite corners are equal. Build the platform with treated 2x6s, 24 in. on center, and cover it with treated 3/4-in. plywood (Figure B).