Quote: pressure treated wood rots just as much as any other wood will, it simply doesn't get bugs moving into it that would speed up the decay process. we also had a pressure treated deck, but one section of the rain gutter was faulty and water continually dripped on one section. it rotted within a couple years while the rest was ok. since then we have replaced it with a composite board. it's a wood-plastic composite that will not leech and can even be used on floating docks and won't rot... hubby's boss replaced his dock decking about 10 years ago, and it's still holding up solid as it was the first year.