The blistering heat of the Southwest. The bitter cold of the Northeast. Every region faces a set of unique climate challenges that—no matter where you live—slowly but surely work to erode the integrity of your home. As a first line of defense, exterior siding goes a long way toward keeping the elements at bay, and it may do so unfailingly for decades. But no siding lasts forever. Indeed, it’s only a matter of time before yours will succumb to driving rain, whipping wind, and the other threats it once protected against.