Hi plumber89 Either method is ok but if you choose the breathable felt option the area between the felt and the room insulation will get incredibly hot so adding eaves and ridge vents will reduce this. Rather than ridge vents you could use vent tiles just below the ridge. Whether you will notice any appreciable difference in the attic room temperature between the two methods is difficult to predict. If you are having a re-roof suggest you go for a combination. Regards S
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