warped panelling

Does anyone have any ideas as to why wall panelling would warp? It's 4x8 sheets, applied directly onto a finished wall with drywall over studs. The warping is occuring on every wall, interior and exterior. It was nailed on every stud, 6 - 8" spacing. Very strange. Thanks for your help.
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gstone99 wrote:

Very strange indeed. Are the nails still holding or did they pull out? Did the warping materialize with temp or humidity changes? Thats all I could think of. Google "wood movement"
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gstone99 wrote:

Some panelling types are just prone to do that when humidity/moisture gets too high, and especially if the pieces are butted right up against one another, with or without the seam covers applied.
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