im puting a new porch it is 16'long and 10'wide what is the the best way to do the roof?
Answers:
Your question was a little tough to understand.IF you mean your leaving an existing roof,and IF you mean you only have 3' of height above existing roof to work with.Try adding tapered pcs. of framing(2x4-3" on one end and 1" on opposite end) on existing roof, place then directly above rafters.Then apply sheathing,trim and roofing.
(you can use any taper you like depending on how much pitch you want just remember if you use a bigger pc. of framing 4"-8" it will be harder to attach to existing roof)
Other answers:
use a rubber roof will not leak if done right
use a rubber roof will not leak if done right