how to lay paving stones in concrete

Laying paving stones in concrete gives them a permanence not found with sand or gravel bases. This is the preferred base for close-fitting paving stones arranged in specific patterns.
 
1Step One
Remove turf and topsoil to a depth of the stone plus 2 inches. If you plan to park cars on the paved area, dig farther to allow for a 4-inch sub-base of crushed rock as well.
 
2Step Two
Allow for drainage by creating a slight slope away from nearby buildings. A drop of 1/2 inch per yard is about right.
 
3Step Three
Spread 1 inch of sand across the bottom of the area. (Add the sub-base of crushed rock first if applicable.)
 
4Step Four
Level the sand with a 2-by-4 by dragging the board's edge across the sand and frequently tamping it down.

5Step Five
Position the stones and the borders in the sand. This is where they'll be when you're finished, so be precise when laying them out.
 
6Step Six
Mix 1 part cement with 4 parts sand and add enough water to make a mortar.
 
7Step Seven
Begin at a corner and remove 4 stones. Spread the mortar 1 1/2 to 2 inches thick in the open space where the stones were.
 
8Step Eight
Set the stones back in place in the mortar. Tap each with a mallet (buffered by a block of wood) as you go. You want to make sure that each stone is set evenly.
 
9Step Nine
Place 1/4-inch-wide wooden spacers between the stones as you lay them. Use scrap wood to make these.
 
10Step Ten
Use a 2-by-4 board and a carpenter's level as you go to make sure the stones are level.
 
11Step Eleven
Pull the spacers out before the mortar dries.
 
12Step Twelve
 Let the mortar set for at least 36 hours. Avoid allowing any weight on the stones, or they may wobble later.
 
13Step Thirteen
Finish the project by mixing 1 part dry cement and 3 parts dry sand. Sprinkle this into the spaces between the stones and brush away any excess.
 
14Step Fourteen
Go over the entire area with a very fine spray of water to wet the cement-and-sand mixture.
 
15Step Fifteen
Expect the surface to set within 48 hours.
 
Tips & Warnings
Accurate measurements are very important when laying pavers in close patterns.
Keep the top level about 3/4 inch below the height of the lawn; you'll be able to mow right up to the edge without worrying about damaging your mower.
Consider renting a power plate vibrator. This machine looks something like a lawnmower with a flat metal plate in the bottom. Go over the entire area to press the stones into place and ensure that they're level.
Don't attempt this project if there's a chance of rain. The mortar won't hold if it's too wet.