After 30 minutes of roasting, pour BBQ sauce over ribs, reserving about 1 cup for later. Reduce oven temperature to 350°F and bake ribs another 60 minutes (or longer, depending on thickness of ribs), basting with sauce every 15 minutes. Ribs are done when meat is tender and cooked through, and the internal temperature reaches a minimum of 145°F. You can cover the pan loosely with foil for the final 30 minutes of baking if the ribs appear to be drying out. Be sure to keep basting the meat frequently to keep it moist and flavourful.