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This homeowner decided to go with the upgrade Bone Dry offered and chose to add synthetic felt onto their roof. Synthetic Felt is laid over the decking on the roof and under the shingles, and is a way to lock up any excess moisture that may get to it. This is a barrier so that the water doesn't go straight to the decking, and cause rotting and water damage, which then means getting that decking replaced. In the long run, synthetic felt can save you a lot of money.