Preheat oven to 250 degrees F.
Combine all of the dry rub ingredients in a small bowl. Prepare the rack by removing the membrane from the back of the ribs and cutting away that extra little flap of tough meat across the top. Line a baking pan with aluminum foil. Rub in the dry rub on all sides of the ribs. Roast uncovered at 250 degrees F for 2 hours.
After the ribs have cooked for 2 hours, remove them and pour some of the BBQ sauce over the top of the ribs. Using a brush, gently spread the sauce all over the ribs. Cover the entire pan tightly with aluminum foil and return to the oven, baking for an additional 2 hours, or until the meat begins to pull away from the bone.
When ready to serve, brush a little extra sauce on each serving.