The library has a tremendous resource of roofing information. Manufacturer's web sites also have a vault of installation techniques and recommended accessories. YOu may also want to try the National Roofing Contractor's Association (NRCA).
NRCA's "Handbook of Roofing & Waterproofing" is the best. Expensive to buy, but some libraries have it. Also, the Asphalt Roofing Manufacturers Association (ARMA) puts out a great 30 page pamplet on shingling. Most shingle reps have copies handy to give out.
My favorite source (for when the homeowner's are an*l retentive) is the bundle wrapper.
Homeowner: "What are you doing?"
Me: "Just reading up on out how to put these things on. I should have it pretty soon."
Contractor Talk - Professional Construction and Remodeling Forum
A forum community dedicated to professional construction and remodeling contractors. Come join the discussion about the industry, trades, safety, projects, finishing, tools, machinery, styles, scales, reviews, accessories, classifieds, and more!