When it comes to roofing, most homeowners don’t know their shingles from their elbows.  Roofers tout their “lifetime warranties” and 30 year guarantees.  It all sounds good, but the truth is that most roofs don’t last for even 20 years.  How is one to know what a roofing and shingle guarantee really means?  The Roofery did some research and came up with some surprising findings about roofing and shingle warranties.