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Putlog hole
A putlog hole is a small hole in the wall of a building, designed to accomodate the ends of beams or logs (putlogs), especially prevalent in the medieval period.
Putlog holes were used for both structural, especially in the use of supporting hoardings, and temporary reasons, such as for for the support of scaffolding during construction.
The term 'putlog' is thought to be derived from 'put' and 'lock'. The word 'lock' has been corrupted by the influence of 'log'.
Many castles display putlog holes visible in the walls in a spiral effect. This is usually evidence of hoardings. Today putlog holes are still used for scaffolding.
