By sempak. Patio. Published at Tuesday, September 26th, 2017 - 15:57:02 PM.
Most of the time, they are not square. Look at a bluestone patio, and stand at one end and look at the lines of the joints. They should be straight and even. Yet because bluestone is not always cut properly at the quarry, the pieces are not exactly straight. If used as is, your joint lines will not be straight either.
In the Northeastern US, most suggest using at least a 4-6 inch base of crushed stone, and even up to 7 inches is recommended due to harsh winter weather. For brick pavers, this means that you'll need to dig to about 9\" depth, since the pavers are 2 inches in height. Since this is a lot of digging, it may be one of the primary reasons to hire a landscape company.
Patterned Bluestone: This stone is rectilinear in shape. You may use stone that is all one size or it may be a combination of sizes. Stones that are 18'x18' or 24\"x24\" create attractive designs. The stone pattern may be laid perpendicular to the house, or it may be on a diagonal. This stone also may be wet laid or dry laid. If dry laid, try to keep the joints between 1/4\" and 3/8\" for a tighter fit. You have a little bit more flexibility in joint size if setting the stones in mortar.
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