Lack of Expansion Joint or Lack of Moisture Proof Membrane?


Expansions Joints - Which factor would have the greatest influence, lack of an expansion joint (longest run is 38') or lack of moisture proof membrane beween the plywood and the tile? The house is 9 yrs old - why no problems until now - initiated use of a humidifier in the basement last summer or the cold snaps in Jan & Feb (55F to -7)?


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