Footings
Footings are usually constructed from brick, they are the base on which a timber floor is laid.
Most commonly used on sloping blocks of land.
Here is an example of the basics of a footing lay out, very basic, but it gives you the idea of what its about.
Google Sketchup required to view the file, download it free here.
Brickwork.net.au
Make sure that you you work out the heights before you start laying otherwise things will end up like this sorry looking pier with a Brick On Edge in the middle of it.
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Bad Pier
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