Manufacturer's Specifications
- Provides multiple support heights of 2, 3, 4, 5, 6, 7, and 8 inches from one unit
- Has a compressive strength of 4000 psi (pounds per square inch) concrete mixture strength
- Weighs approximately 7.2 lbs
- Designed with a tie wire hole of 5/8 inch in diameter to allow for the easy fastening of the loop tie wire to the rebar
- Designed to repeatedly break at the web by the weight of the brick
- Breaks uniformly when struck on a hard surface such as the ground or foundation
- Replaces wire chairs and other methods
- Stays in place with tie wire
- Affords varying support while walking across mat
- Resists sinking in sand and soils
- Economical and costs about the same as standard brick and wire chairs
- Made out of the same material as the foundation, making the foundation pure
- Becomes stronger as it ages
- Inspectors like it
