Rotting pella windows. In inspecting the photo of the rotted bottom rail of the sash, I notice a dark line where the sash closes into the frame.
Above this line is a darkened stain from water. This should have been evident way before the rotting, and would have been a good indicator that something was amiss - that water was present where it should not be. That would have been a good thing to have not ignored. I agree with the folks here.
Water looks like it got behind the sash from above, and then sat trapped at the bottom. I also would like to suggest another possibility. This looks very much to me like possible insect damage. I have seen this before, where opening a window that had not been opened in a long time revealed a colony of wood eating ants.
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I have seen whole houses munched on by insects, and termites are not the only culprits. I should add that if no insects were present when this was discovered that does not mean that for some reason they didn't flee on their own. Just saying that is another possibility. You want to make very certain about this, because if it might likely be the case, then you will want to make sure to have your house treated by professional pest people. I've never seen that kind of rot in a window unless there was a major leak of some kind. You should have your attic and roof inspected to make sure there is not water running down the walls and getting trapped above the window frames and working down into the frame behind the sash.
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I have seen that happen many times. Other than those things, my only other comment would be towards the wood and the preservative. The reason old windows don't rot isn't because they were better. It's because they were made out of old growth trees.
They were slower growing, had denser rings and harder cores. Trees now are fast growing re- forested trees and the wood is very very soft.
It plays a factor in moisture absorbency. Wood must be maintained, including the bottom. I suspect a leak more than anything. And failure to check the windows out once in a while, open them up and clean them out and make sure everything is ok.