Roof: To Roll or Not To Roll? • & bull; ASAP Roofing
https://mike-wiki.win/index.php/Leak_edge:_Over_or_under_tar_paper_at_the_eave%3F
Prevent this by taking down an underlayer in the roof for regarding 3 feet or so to add an added layer of security against thawing ice water. Incorrect use of nails.Shingles can slide down if they aren't nailed