I am going to be re-roofing a small shed. I plan to use the GAF Grand
Timberline 50 year architectural shingle. I have several questions:

I have read that I should use a "starter" course along the eaves and rakes
of the roof. But, the book that I am reading says that this starter course
should be a 3-tab type shingle. Why is this ??

I don't see a 3-tab shingle at the GAF website that comes in the same color
as the architectural shingle that I would like to buy. (I guess it
doesn't matter much if the starter rows would all be covered up anyhow ??)

I have thought of using the rubberized WeatherGuard instead of felt. Is
this better than paper felt? Although I think it would be quite expensive
for a house, just 1 roll would do for my shed.

Should I order 1 1/2 nails for these architectural (50 yr) shingles
??


What size nails would I get to lay down the WeatherGuard ?? Would it be
the same type nail as the nails for the shingles ??

Thank you very much !!

--James--