Every time someone mentions that Collinwood was built in 1795, I really have to suspend my disbelief.  That type of architecture was *so* not en vogue at that time!  Also, the Old House could not have been built in the mid-18th century, either...but, hey, if I can accept vampires, werewolves, Parallel Time, and the rest, I suppose I can accept historical discrepancies, too.  Back to your point...well, there's a lot of wood throughout Collinwood, too.  Notice the hallways and the rooms, particularly the drawing room, which is composed entirely out of wood.  Anyway, Collinwood would *never* get soggy:  it thunders, sure, but it never rains, nor does it snow!  Everything is completely warm even during the winter months.  Why else would Vicki run around in sleeveless Orbach gowns during December?