Salt, wind and freeze on a New London roof
New London sits at the mouth of the Thames River on Long Island Sound, so salt air reaches most of the city, and the streets near Ocean Beach take it directly. Salt shortens the life of galvanized flashing and nail heads and speeds granule loss on shingles. Wind off the water lifts tabs on south-facing slopes during storms and nor'easters. Winters still bring snow and freeze-thaw cycling, and on the older houses with unheated attics, that means ice at the eaves and water backing up under the lower courses. Flat rear sections hold snow and slush longer than the pitched roof above them.

