Harbor wind and city winters on New Haven rooftops
The city sits on the harbor, so wind-driven rain off the Sound reaches the lower neighborhoods and corrodes exposed metal, while East Rock and Westville are shaded by mature street trees that fill gutters and grow moss on slate and asphalt alike. Winters bring snow that sits on flat roofs and ice at the eaves of steep Victorians whose attics were never insulated. Freeze and thaw works at every old chimney, slate hook and membrane seam, and summer heat on dark flat roofs ages the membranes faster than in the suburbs.

