Actually,
Actually, there wouldn't be anywhere to attach the undersill trim, because these are double panels. And it looks like the bottom of the windows falls in the area of the middle of the double panel, not where the top piece locks into the next vinyl panel.
Thank you so much for your explanation. I'm a first time homebuyer trying to make sure the builder did it right and I'm not very technical besides some research I've done. I think overall you are saying, no, the undersill trim is not necessary for my windows!
Hi, thank you for your reply! The vinyl is locked in in the area I circled in pink and on the other side of the window. Would you say it's still necessary, maybe to prevent warping?
These are the windows they installed with integrated J channel...