Bricks, Masonry, Asphalt and Concrete - Brick Paver over Concrete

I live in New Jersey and would like to place brick pavers (in sand) over an exsisting concrete patio (12X45). The patio is stable, but has had some spalling and one area that has settled about 1/2" (that is why I want to use sand as a base). I have about 4 1/2 clearance to the door threshold. Can I use 1/2 height bricks? What is the best way to proceed? What is the best method for calculating materials?

The brick folks made a thin paver which may be just what you need. Usually, dry laid brick go in 1 inch of sand, so you should have plenty of space.

You will need approximately 45 cubic feet of sand or slightly less than two cubic yards. There is not absolute standard size brick, but a typical 4" x 8 " brick would constitute one of about 200 bricks needed, plus an allowance for waste.

Here is a how-to page on this project: http://doityourself.com/brick/mortarlesspaving.htm

Hope this helps.