Highly Sod After

It is Thursday evening, time to water the lawn. Jacek Perkowski slips on some flip-flops and walks through a glass door in his open-air living room. He grabs a hose and gets to work. But Perkowski isn’t watering the grass in his yard; he’s watering his roof. There, above the rafters of his three-bedroom house, a seven-inch-deep carpet of sod grows in green velvet chunks. "The idea of having parties on the roof, this kind of thing, was very important for me," says Perkowski, a Polish rock musician and former member of T. Love. "It’s another way of enjoying and living in and around the house."