Perpend stone

The bond stones seen on the end of the right wall extend across the width of this tall, battered, dry-stone wall. Attribution: Humphrey Bolton

Perpend stone (parpen, parpend, perpin, and other spellings),[1] bond stone, or tie stone is a structural element building term used by stonemasons and brick masons. Perpend is also a piece in brickwork also called a cross joint or when extending through the entire wall a transverse joint[2] or perpend bond.[3]

Usually stone walls are built with two layers of stone, an inner and an outer layer, with the space between them sometimes filled with rubble. A perpend stone is a longer stone that extended through the entire wall's width, from the outer wall to inner wall, which serves to lock the two wall layers structurally together.

References

  1. ↑ "Parpen, parpend" def. 1. Oxford English Dictionary Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009
  2. ↑ Richard, H. W.. Bricklaying and Brickcutting,. London: Longmans, Green, and co., 1901. 4. Print.
  3. ↑ Phillipps, Alfred Edward, ed.. Masonry construction; a guide to approved American practice in the selection of building stone, brick, cement, and other masonry materials, and in all branches of the art of masonry construction. Chicago: American school of correspondence, 1908. 64. Print.


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