large icicles and ice dams form at the edge of the snow-covered roof above frozen eavestrough gutter

icicles ice gutter dam eavestrough roof insulation inadequate attic snow snowload cold clogged buildup gutters freeze outdoors maintenance leaking leak venting vent thaw residential winter soffit shingles dangerous building construction drip exterior hanging heat home house loss melt outside problem repair residence roofing season water eaves flood flooding damage dripping