A buildable seal assembly (100) is used with a jacket (102) which is connected to a sidewall (14) and slide out room (12) of a conventional RV or similar mobile equipment or mobile living quarters (10). A right angled seal element (132) is coupled to the jacket (102) in a snap in configuration. The right angled seal element (132) is further coupled to a bulb (152) and a wiper component (146). The bulb (152) and wiper component (146) assist in providing a seal between the mobile living quarters (10) and the slide out room (12) when the room (12) is in a retracted, closed position or an extended, open position.