On Jul 4, 8:44*pm, "Percival P. Cassidy" wrote:
.. in the cavity behind the one-piece bath/shower surround of our 30+
yr-old house -- many offcuts of sheetrock and an empty sheetrock
adhesive container. I assume they simply couldn't be bothered to pick it
up and take it away. Is/was this a common practice?

Perce

yeah I have found all sorts of stuff in walls. Including glass milk
bottles from 1949 when this home as built..