Just a note on the etherbond tape. I used it last year with poor results, I determined I applied it wrong. I used it on the edge of the roof, where the roof transitions from horizontal to vertical. After a few months of head scratching (electrical tape worked great during this time). I reapplied the tape, and it has worked great ever since. What I did wrong the first time was to stretch the tape, as I rolled it around the edge.