We have a nice house, with a standard roof over plywood. At least 30
years old. The west facing side is very worn and needs to be replaced.
The house is a Mock Tudor. There seems to be 4 options:

1. lay shingles over the existing roof.
2. lay new 30-40 year roof.
3. cover only the west facing roof
4. replace the west facing roof.

Any suggestions on what use as roofing material, under fabric,
alternate stuff, like artifical slate material

I will be getting estimates on all the options, don't have them yet
and it will be expensive.

We live in Seattle, below the snow lines.

Any help on what to look for, look out for or other ideas would be
welcome.
--
les ungerleider