Also the perfect storm scenario. If you get a Chinook or unusually fast quick melting of the snow in one day and very cold weather that night the snow on the edges by the gutters does not do it's usual slow progressive thaw and the water from above cannot get thru it and backs up under the shingles and can leak into the house. Next time I get shingles done I am going to pay extra for that membrane under the shingles at the edges and valleys.
"Cut it twice and it is still too short".
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Last edited by yuri; 02-07-2013 at 11:34 AM.