3 X on this very important venting to begin on lowest possible point in roof system to highest possible best being the ridge. Adding venting in between will short circuit causing dead spots in the air flow. The usable space of your building should be a sealed box with the roof system just a cap. The goal is to get the attic as close to outside conditions as possible, and still shed the elements. I have vented many roofs and replaced many due to unvented or sealed systems. I've seen where short circuiting air flow can cause additional condensation from heat loss or overheating.
I used countinous ridge venting wherever possible, usually go from roof end to end just because it looks better. The are several good brands for shingle over ridge vents and I prefer the mesh types and never had issue with plugging,and vent the soffits countinously wherever possible.
I don't encourage venting usable space to the roof but exhaust directly outside.
Many years of 3 tab shingle install that have had very good life if installed correctly and good ventilation was in place. Shingles installed in cold conditions and not having good heat and sun directly after tend not to seal as well.
I also used the rafter vents that D beatty pictured all the time and never regretted it.
I roofed a neighbors house 32 years ago with 25 year IKO 3 tab shingles following these practices replacing rotted roof boards, resheathing. They look like they could easily do another 10 years, best part is that they are still happy with job and still a great neighbor.
These are practices I've used with very good results for many years. Good Luck and happy building!
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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