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UseABiggerHammer t1_je66q9m wrote

Figure out why they are rotting and correct that issue first. Usual culprits are either lack of proper drainage or mis-aimed irrigation.

That outer area is entirely cosmetic so it's up to you whether you replace it or just rip it out and deal with what's left. It's the casement part around the actual frame of your window that's critical for sealing. The key to replacing those casements will be matching the dimensions of your window, because it's easy to shim a bigger opening but you can't squish the window into a smaller one. The windows are probably screwed to the wooden casements and sealed with clear or white silicone.

The most durable solution to replace what you have would be composite trim. It usually comes in white by default.

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gitsgrl t1_je704cu wrote

It’s wood below grade, it was destined to rot.

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AreYouDaveDavidson t1_je6fs1y wrote

Fixed this exact problem last year on my house. Replaced the rotten wood frame around my PCV windows and installed weeping tile and a sump pit outside.

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re-run t1_je75fp0 wrote

Wood rots over time anyways, in most locations, even when drainage isn't an issue. So, there might hot actually be anything wrong. Could just be a moist are that has a lot of humidity. It looks like a block foundation, so the house likely has 30+ years, and that is likely an original window.

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