We had a general contractor installed part of our lower roof and eavestrough. The eavestrough has been leaking since. But we recently noticed a piece of garbage bag sticks out from under the shingles. We asked the contractor about that. He said it was for moisture blocking. Now, I don't know anything about roofing but it doesn't seem right to put garbage bags up there. He also said that he used only about 5 ft of that. I asked what's underneath the rest of the roof. He said it's felt. That doesn't sound like my roof is protected from water. But the contractor said that if the roof doesn't bother me in the first year or two, it would be fine and I don't have to do anything about it.
My questions are:
1. Would garbage bag protect my roof from water?
2. For places without the garbage bag, what will happen to the roof?
3. Should I start worrying about my roof now?
4. Can some good sealing replace the existence of the wall flashing?
Thanks for your help!
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