Norwich valleys, hills and winter ice
Norwich sits where rivers meet at the head of the Thames, with steep hills rising from the water. The valley holds damp air, so north-facing slopes and roofs under big street trees carry moss and algae. The hillside neighborhoods catch wind from several directions, which lifts shingles on exposed edges. Winters are an inland pattern of snow followed by thaws, and that freeze-thaw cycling fills gutters with ice and pushes water under the first few courses on houses with poor attic insulation. Flat porch roofs and rear additions pond water when their drains or scuppers clog.
