I absolutely love the roof that comes with apartment life but something has always bothered me about it. As someone who lives in a city with that architecture the fact that there isn't an extra roof above the apt roof that is sloped is weird and inaccurate, the rooftop is flat and if you add regular roof it doesn't match. I can't find any pics on Google so I hope I'm being clear. So, is there an add on for apt life roofs?

Understand your frustration. But I think there is no extra part (not that I know of). The only thing I can think of that possibly "solves" the problem is this matching ceiling set.
https://modthesims.info/d/309331/ma...oof-pieces.html

You're not the only one bothered by the lack of matching texture options, here are some recolors of the deco pieces matching existing Maxis roofs: https://tvickiesims.tumblr.com/post...oof-match-mania
There's also these half-height add-ons: https://modthesims.info/download.php?t=406612

These may do the trick. Thank you guys!