WEBContact Trusted Montana Roofers. Address: 9550 Derby Drive, Missoula, MT 59808. 1401 N Oakes St., Helena, MT 59601. Serving the Whole State of Montana. Phone: 406-829-9100 (Missoula) 406-443-3922 (Helena) Email: info@summitroofing.info. Mon - Fri. 8:00 am - 5:00 pm. Sat - Sun. Closed.