有公司推荐吗What are Ice Dams? Can They Be Avoided? | Desi's Roofing
Canadian winters can be hard on your most important asset of all—your home. Learn what ice can do to your roof and the steps you can take to minimize serious damage.desisroofing.com
加insulation不一定有用。一般在屋顶底部6ft要加ice dam shield。
等换屋顶吧,工作量太大,散工没法干。有公司推荐吗