I am looking for a way to check if the player is under a roof or atleast in a building. I didn't see any native that returns if a ped is under a roof, so I am asking is there some way to achieve that.

You could try checking if the player is in any interior combined with probing the ground Z slightly above the player and see if it returns a position below or above the player.

thx for the reply, but I don't know how to check if the player is in an interior. 

nevermind, I figured it out by using INTERIOR::IS_VALID_INTERIOR(INTERIOR::GET_INTERIOR_AT_COORDS(playerPos.x, playerPos.y, playerPos.z)), but still thanks for your help!