Name: Knockout Roofing. Descripton:Offering Commercial Snow Removal Knockout roofing is A GAF Master elite certified contractor, Offering Manufacture warranties. With the seal of approval from Good housekeeping, We also offer Lifetime flat roof Warrianties from IB PVC Flat roof membrane products. Free estimates for Property owners, Residential and Commercial. Serving Salt Lake valley Now Offering payment options, 90 day, 180 day, 365 day Same as cash options. 5 yr, 7 yr and 10 yr low interest loans available. O.A.C. Rating of 4.6757 based on 37 reviews.