I know how many linear feet I need.  Its for the floor between floors.  Its about 350 linear feet.  Total square feet is 486 or 13.5 ft x 36 feet.  I want to use r-19 insulation.  But everything is calculated in sqft.  I have no idea how much I need.  
How many of these
http://www.homedepot.com/Building-Ma...atalogId=10053
			
			How many of these
http://www.homedepot.com/Building-Ma...atalogId=10053
				
		
			