What is the Reese Roofing Guarantee? Glad you asked...At Reese Roofing, we are GAF Certified Roofing Professionals that aren't scared of putting things in writing. This protects you and holds our Roofing Pro's accountable for our actions and the promises that we make! When Reese Roofing performs a complete roof replacement on your home, you can rest assured that we will treat it like it's our mothers home and we further guarantee that our work meets and usually exceeds the manufacturers installation requirements. This means that as the homeowner...you can have peace of mind knowing that after your job is complete, you will receive a certificate of warranty from the manufacturer, covering manufacturer defects.