Hi, I am confused and would like some knowledgable advice. My "builder's basic" 25 year shingles are at that magical time....ie, I need to think about reroofing. The trouble is that it seems there are as many different opinions as there are contractors. What are the advantages vs disadvantages of striping off the old tar shingles vs leaving them on and roofing over. I understand code states that you can have 2 layers of shingles. Secondly, although I can't really afford real tile or slate, but there are a lot of new resin look-a-like products out there now. How would these compare to tar shingles or even metal ones?
Joe in Indiana