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Ice guard is also known as ice and water shield. It is an underlayment that is waterproof, adheres to the roof decking and self-seals around small perforations (nails, screws, staples). Code determines if it needs to be used, how deep it needs to be from the edge and on which edges, based on the roof pitch and local climate. Similar material is used to seal window openings and windows.
Ridge vents are pretty easy to install. I don't know if 10' will be enough to vent your attic space. Each manufacturer should have some published guidelines. Turtle vents are ugly, but you may not have a choice.
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