All the malting kiln tiles found in Southampton are in post-med deposits.
Most have series of large holes almost through the tile but upper surface
pierced by a grid of smaller ones. Have never seen such a thing in a
medieval context. I'm sure I read somewhere that early malting kilns used
textile sheet, ? woven horsehair. Early kilns all small affairs, perhaps
tiles came in when it changed to an industrial process, and people needed to
walk across the kiln floors turning the malted grain, or is it only the
germinating floor that they walk about on?