The Flagstone Process

Flagstone can be laid in two ways, dry lay and wet lay.

Dry Lay

Before Curbz

The area to be flagstoned is dug out to a minimum of 8 inches and sometimes deeper depending on the drainage.  Filter cloth is laid and the area is then filed with hpb (high pressure bedding) or limestone.  The behavior of hpb offers ease of compaction requiring little to no effort to compact.  Drainage characteristics have been tested well above threshold requirements with impressive results.  Hpb is the standard fill we use, it is slightly more expensive but the ease of use and the fantastic drainage is well worth the investment.

Flagstone is then laid on top of the hpb in various patterns (random, running bond, 45 degree angle).  These are all examples of square cut flagstone.  Square cut is where all of the stones fit tightly together, all of the edges being square.  The gaps are small, 1/8th of an inch or smaller.  The area between the stones is then filled with polymeric sand which hardens after it is sprayed with water and helps with the horizontal strength of the area and to help prevent weed growth.

If random stone is used (all of the pieces are unique and all are different in size - no straight edges), then the gaps will be larger and all of the pieces are placed like a jigsaw.  There is a lot of chipping of the stone in this process to get all of the pieces to work together.  Limestone and/or hpb is used as the base and the surface gaps are filled with a thicker polymeric sand because the gaps are wider.

Wet Lay

After Curbz

This is when the flagstone is mortared to a concrete surface whether it be a poured pad, a front patio or concrete stairs.  Once the mortar has hardened then the gaps are filled with grout.  The time to complete mortar work is much longer since there is usually more cutting and a return visit is needed to grout the stone.  Wet lay can be either square cut or random flagstone.

For further information, feel free to email or call us at
416-777-CURB (2872).