My next roof will definitely be metal. If it is this house, the tar shingles may or may not be removed first (depends on condition and weight load on roof, I would prefer to leave them than landfill them). I will put a layer of foiled foam as insulation and radiant barrier, then sleepers to get the metal 3-4 inches above the existing roof and extend the eaves another 2-3 feet (to give them proper passive
solar size for this region). If I can figure out how to avoid wind lift.
"You must be the change you want to see in the world." "First they ignore you, then they laugh at you, then they fight you, then you win." --Mahatma Gandhi
"Preach the Gospel always, and if necessary, use words." --Francis of Assisi.
"Family farms work when the whole family works the farm." -- Adam Klaus