Is Mold a Problem

I was watching one of those USA renovation programs on TV and they discovered a lot of mold in the wall frames (behind plaster) etc
They Stated the wall had to be pulled down and rebuilt

When that couldn't happen they got someone in with a dry ice machine which supposable took a fine layer of the timber surface off

Is Mold that much of a problem or was it just because it was in a area where it snows.
Or just a hype for the TV show

Do we those have problems here


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