When this extension was built the under felt was left too short from the gutter with no eaves trays to support it. The head lap on the tiles was also far too short at about one inch which has allowed rain to be blown in by the wind & run down the under felt. we have installed felt support trays to prevent the water from pooling at the bottom of the felt & getting into the building behind the fascia. They will also deliver the water into the gutter & not behind it down the wooden fascia.
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