After Fallout 3 there were a lot of discussion about how unrealistically the 200 years setting was implemented, like wooden houses still standing without any maintenance, canned food remaining uneaten and edible, cars still having paint, clothes lying around in dressers in abandoned houses still intact etc. But how long would different items and structures actually last with or without maintenance? What conditions would need to be met for them to last for different time periods? Excluding super-materials hand-wave solutions. For example, I imagine unprotected clothes in a closet of an abandoned building would be eaten by insects fairly quickly and if not, how long would cotton last anyway? What if they were stored in vacuumed plastic bags and kept in the dark, for example? How quickly does plastic break down in the dark compared to if they're exposed to sunlight? How long would brick buildings stand without maintenance? Longer than modern concrete residential high-rises which, from what I've heard, are built without longevity as a primary consideration? What kind of maintenance would make them last longer? How about guns and ammo? Knives and other stainless steel items? Paper? Rope? Any input is welcome, but if you know of credible sources backing your statements that'd be awesome, or if you have a degree in material sciences, construction engineering or similar, provide that info and people can at least decide for themselves if they want to take your word for it. Borderline science-fiction theories are also welcome if applicable, ie there could realistically or semi-realistically be materials used for this or that in 50 years which could last so and so many years longer. For example, many types of plastics and also kevlar is senstitive to UV radiation and will become useless quickly if exposed to sunlight. Brass bullet casings can crack in the presence of ammonia. I think ceramic roof tiles can last ~50 years even without maintenance, from what the people who replaced my roof last year claimed. Sidings of wooden houses could last maybe a decade if they're not looked after, depending on the paint? As soon as either siding or roof gets damaged enough, the wood frame will start to go. In some cases parts of it can be replaced relatively easily depending on the construction, and the type of damage?