What is GAF Deck Armor? What is GAF Deck Armor? Conventional organic felts can absorb moisture, causing buckling and wrinkling that can impact the look of your roof. Deck-Armor™ Premium Breathable Roof Deck Protection combines strength and breath-ability to help protect your home against wind driven rain and trapped moisture. Deck-Armor™ Premium Breathable Roof Deck Protection is a key part of the GAF Lifetime Roofing System, and has earned the Good Housekeeping Seal. To learn more about Deck Armor or any other GAF roofing products please contact us at 734-495-0996 or fill out the form to the right.