A grab stone has two meanings in construction. First, it is an anti-drowning ledge on quay walls and locks that gives a person in the water something to grip. Second, it is a projecting bonding stone in masonry that protrudes at the side of a wall so that later masonry can be tied in.
The Two Meanings
1. Anti-drowning hand-hold
- A recessed ledge or bar set into the face of a quay wall or lock
- Gives someone who has fallen into the water something to hold on to
- A safety feature required on many waterside structures
2. Projecting bonding stone
- A brick or stone left sticking out from the end of a wall
- Allows a new section of masonry to be bonded, or tied in, later
- Ensures continuity and structural connection between old and new work
Application
Where grab stones are used
- Quay walls, locks and harbours — as a life-saving hand-hold
- Party and boundary walls — where a future extension will be tied in
- Phased masonry — where walls are built in stages and later connected
Related Terms
- Quay wall
- Bricklaying
- Cantilever
- Masonry bond
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