What is the best type underlaylment or roofing sheathing is best prior to installing shingles and also type of fastener such as stainless or galvaninze? Also is better to install ridge vents or solar vents to cool attic and shingles above?
We prefer the synthetics (woven polypropylene) as compared to the 15/30lb felts. It is cheap insurance and we use it as a standard to avoid any blow off (ever seen stapled down felt in a thunderstorm).
Galvanized nails are fine and roof venting is best handled via continuous soffit and ridge venting and should be passive (i.e. non powered).
FYI, you are not trying to cool the attic but provide a pathway for moisture to get out. Venting has nothing to do with cooling.