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Why old plaster falls

Posted by John Sprung on April 1st, 1999 08:32 PM
In reply to sags by judy on March 31st, 1999 08:49 AM [Go to top of thread]

When an old lath and plaster ceiling drops its
plaster on you, look up between the laths. If
there are no remnants of plaster between them,
or very few, then what happened is that the
original plaster just wasn't pushed up hard
enough. It's supposed to go up between the
laths, and slump outward to make keys that lock
it in place. But initially, it'll just stick by
surface tension and friction against the sides
of the gaps. If the old plaster didn't have good
keys, after a while the laths will shrink a little
and it will fall. It could take 10 years, it
could take 80 years, you never know until it

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