I'm preparing to re-roof my home. The current roof is shingled and I have recently repaired a few leaking spots. I've taken a look at a few options and I have a few concerns regarding code and longevity. This home is located in Northern Florida with a 1.7 to 12 roof pitch and a small 24" tall attic, the existing shingles have plywood decking underneath.
I do not want to spend extra, do unnecessary improvements or add additional load (weight) to the existing roof.
Can I place the new metal directly on the existing shingles? I have been told and seen it done and I am concerned if I should use a water/vapor barrier. I would like to NOT install furring strips and/or Styrofoam. I have concerns regarding the noise from rain and I am trying to understand/evaluate the costs respectively.