![GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com](https://mobileimages.lowes.com/productimages/919e1faa-d941-4129-b5d6-15821c0adaac/04602413.jpg?size=xl)
GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com
![Which GAF Roof Shingle underlay to choose, and how to install it - Roof Shingles For Australian Homes Which GAF Roof Shingle underlay to choose, and how to install it - Roof Shingles For Australian Homes](https://www.allamericanroofing.com.au/wp-content/uploads/2019/04/DeckArmor-underlay.png)
Which GAF Roof Shingle underlay to choose, and how to install it - Roof Shingles For Australian Homes
![GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com](http://mobileimages.lowes.com/productimages/f5c7d444-ba79-4a95-93b3-427d68043666/43652117.jpg)
GAF Deck-Armor 48-in x 100-ft 400-sq ft Polypropylene Roof Underlayment in the Roofing Underlayment department at Lowes.com
![Which GAF Roof Shingle underlay to choose, and how to install it - Roof Shingles For Australian Homes Which GAF Roof Shingle underlay to choose, and how to install it - Roof Shingles For Australian Homes](https://www.allamericanroofing.com.au/wp-content/uploads/2019/04/GAF-Deck-Armor-installation.jpg)