Last week, when storm Isaias swept through Montclair and water began pouring in through the wallboard above the windows of her high-end condominium in the Siena, Dagny Henderson was at the ready with buckets. The next day, when the curtain rod in her bedroom came crashing down, loosened by the spongy wallboard, the 87-year-old widow hardly batted an eye.    Read the article……………………………….