CERAMIC
TILE / MARBLE TUB / SHOWER FLOOR: Ceramic
tile and marble or granite tubs and pans are
almost always built on the spot, as opposed to
prefab units which are manufactured elsewhere.
Tubs which are built in this manner are often
called "roman tubs." The next few
paragraphs refer to "shower pans"
(which is actually the waterproof liner
installed under the shower floor, but used
herein to describe the complete liner and tile
assembly). The information herein is the same
for tile and marble tubs. Tile tubs are built
with the same waterproof pan liner material as
shower pans. Ceramic tile shower pans and tubs
have been around for many years. These pans are
prone to leak more than other types, but are
somewhat more durable during their life span.
Occasional review of the floor and walls around
a ceramic tile pan may reveal a leak before much
damage occurs.
Usually the best method of
testing a shower pan is to stop up the drain
with tissue paper and fill the pan up to the top
of the dam. After about 15 minutes water will be
noted under the building or around the pan, if
the pan liner or drain connection has failed.
This "flood test" should not be
attempted if there are rooms below the shower.
Be aware that the inspector cannot ascertain
whether the shower pan leaks unless the leak is
evident. Flood testing of the pan is not
performed by the building inspection company.
There have been many documented cases where
flood testing showed a false positive result.
Water can take many hours to work its way
through the flooring and pan liner material.
Soap and other debris may hold back the water
until the soap softens; it will then will break
loose and allow the leak to come through.
Sometimes this process can take one or two days
and often requires a second and third flood test
or more. The "bottom line" is...a
simple single flood test is rarely conclusive as
to whether there is a pan liner failure. Under
most circumstances flood testing is performed by
the pest inspector (if a pest inspection is
called for). Generally, no inspector will flood
test shower pans which are installed over
finished or unfinished rooms below. Any leaks
resulting from the flood test would damage walls
and ceilings of the rooms below. Please contact
the inspection company should you need further
information regarding this limitation. If leaks
are noted in ceramic tile, marble or granite
pans contact a Ceramic Tile Contractor for
repairs. Expect repairs to run from $300.00 to
$900.00 and up.
The above information was provided by TWI Systems Copyright 1995-2005 1-800-553-5660