cover block

spacer

1. In glazing, one of the small blocks of wood or other material placed on both sides of the edges of glass, during its installation, to center it, to maintain uniform width of sealant beads, and to prevent excessive sealant distortion under lateral loading.

2. A device which holds steel reinforcement in its proper position, or which holds wall forms at a given distance apart before and during concreting.

3.See edge spacer.

4.See shim spacer.