61.   That brings on the lesson on ice dams.

62.   That difference can result in ice dams, which has been quite a subject of conversation, news stories and insurance claims this month.

63.   The air space between the metal roof and the old roof may stay cold enough to prevent ice dams, even though there is no air flow.

64.   That way the roofer can put an ice and water shield on the edge of the roof to help prevent leaks from ice dams.

65.   The best way to prevent ice dams, Keefe said, is to keep the roof uniformly cold with proper insulation.

66.   The proof of the pudding is whether you have ice dams and leaks.

67.   The roof is probably cold enough in winter to prevent ice dams, but you might get it a little colder by taking down the beaverboard.

68.   The roofers are busy these days, repairing roofs damaged by ice dams or by overzealous shoveling of snow and ice that built up during the ice dam season.

69.   Then comes a quick freeze, and the water under the snow freezes, forming the ice dam.

70.   Then at night a cold snap freezes this water, forming the ice dam.