the.com/grouting

the unsung mortar between your tiles, quietly losing a slow war with mildew

means Grouting is the act or material of filling the joints between tiles, bricks, or stones with a paste-like mortar that sets to seal and bind them.

from From "grout," which traces back to Old English "grut," meaning coarse meal or the dregs left after brewing — the same family as "grits" and "groats." The thread that ties them together is the sense of a thick, gritty sediment; over time the word slid from porridge-leavings to the gritty, lime-and-sand slurry masons smear into the cracks. The "-ing" simply turns the substance into the ongoing labor of applying it.

ancient roots
Romans grouted with volcanic ash and lime
two types
sanded for wide gaps, unsanded for fine
weak link
it cracks before tiles ever do
epoxy upgrade
newer grouts resist stains and water entirely
verb origin
from 'grout,' Old English for coarse meal
for instance

burj khalifa foundation — 330,000 cubic meters of grout injected into bedrock at 828m-tall dubai tower, 2004-2010

channel tunnel grouting — massive grout sealing operation under english channel after water breakthrough during 1988 excavation

three gorges dam — continuous grouting of dam foundation in hubei, china to prevent seepage through rock, 1997-2006

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