Transform squares to square foot

http://dallasiyen976.jigsy.com/entries/general/why-you-might-not-wish-to-do-it-yourself-with-spray-foam-insulation

<h2>How Many Roofing Shingles Do I Required for My Roof?</h2> So make use of linear feet to figure how much ice barrier material you need. At 4 nails per tile, that's about 320 nails per square. <div itemScope