Mich F wrote:
I don't know why anyone would consider that. It seems if they were capable of doing that, it would be cheaper and easier to put on a new roof.
Also if putting it on over an old roof, a major consideration would be that the original roof material was securely attached as the tape would be bonding to it. Decent roofing material only costs about $6 a running foot in 10' lengths so 3' of roofing material would only be $18 and not $500. Then consider that you would want to run the tape down behind the drip edge and it soon becomes apparent that reroofing is the way to go. Also once you have the old roofing material off I am sure you will find at least one place where the underlayment will need to be replaced. Do it once, do it right. JMO
