Precision dry-stack masonry unit

1. A masonry wall comprising:

a first row of a plurality of masonry blocks disposed in an upright orientation, each block having:

two spaced-apart face shells, each shell having a connector edge and a free edge vertically opposite the connector edge, and

at least one connector joining the face shells, the connector having a top surface, a bottom surface, a right surface and a left surface, the bottom surface of said connector coplanar with the connector edge of the face shells, the top surface of the connector and the face shells forming a horizontal channel, and each of the right and left surfaces of the at least one connector and the face shells forming a vertical channel,

a second row of the masonry blocks disposed on top of the first row in an upside-down orientation such that the horizontal and vertical channels of the blocks of the first and second rows meet to form a hollow grid,

grout disposed in the grid bonding the masonry blocks together to form a wall.

2. The wall of claim 1 , wherein the face shells of each block are oriented parallel to one another.

3. The wall of claim 1 , wherein the face shells of each block are a rectangular cuboid shape.

4. The wall of claim 1 , wherein the blocks are made of at least one of cast concrete, foam concrete, fly ash, bottom ash, sand or gravel.

5. The wall of claim 1 , wherein the face shells of each of the plurality of blocks are of approximately identical shape and proportion.

6. The wall of claim 1 , wherein said at least one connector comprises two connectors.

7. A method of constructing a wall comprising:

laying a first row of masonry blocks in an upright orientation, each of the blocks having:

two spaced-apart face shells, each shell having a connector edge and a free edge vertically opposite the connector edge,

at least one connector joining the face shells, each connector having a top surface, a bottom surface, and right and left side surfaces extending between the top and bottom surfaces, the bottom surface of said connector coplanar with the connector edge of the face shells, the top surface of the at least one connector and the face shells forming a horizontal channel, and each of the right and left side surfaces of the connector and the face shells forming a vertical channel,

laying a second row of masonry blocks in an inverted orientation on top of the first row, the free edge of the face shells of the first row of masonry blocks engaging and supporting the free edge of the face shells of the inverted masonry blocks of the second shell, such that the horizontal and vertical channels of the first and second rows of blocks meet to form a hollow grid,

laying a third row of masonry blocks in the upright orientation on top of the second row of masonry blocks, the connector edges of the face shells and the bottom surfaces of the connectors, respectively, of the second row of inverted blocks engaging and supporting the connector edges of the face shells and the bottom surfaces of the connectors, respectively, of the third row of blocks, such that the vertical channels of the second and third rows of blocks meet thereby the hollow from the first and second rows of blocks into the third row of blocks,

filling the grid with grout to bond the blocks of the first, second and third rows of masonry blocks together to form a wall.

8. The method of constructing a wall of claim 7 , wherein:

each connector having a thickness, and

the length of the face shells is approximately six times the thickness of the connector.

9. The method of constructing a wall of claim 8 , wherein:

the thickness of each connector is approximately three inches.

10. The method of constructing a wall of claim 7 comprising:

placing a reinforcement bar in at least one of the horizontal openings and in at least one of the vertical openings before filling the network with grout.

11. The method of constructing a wall of claim 10 comprising:

interlocking the horizontal and vertical reinforcement bars to form a mesh in the grid.

12. The method of constructing a wall of claim 7 , wherein the face shells of each block are oriented parallel to one another.

13. The method of constructing a wall of claim 7 , wherein the face shells of each block are a rectangular cuboid shape.

14. The method of constructing a wall of claim 7 , wherein the blocks are made of at least one of the group consisting of cast concrete, foam concrete, fly ash, bottom ash, sand and gravel.