A sod roof, or turf roof, is a traditional Scandinavian type of green roof covered with sod on top of several layers of birch bark on gently sloping wooden roof boards. Until the late 19th century, it was the most common roof on rural log houses in Norway and large parts of the rest of Scandinavia. Its distribution roughly corresponds to the distribution of the log building technique in the vernacular architecture of Finland and the Scandinavian peninsula. The load of approximately 250 kg per m2 of a sod roof is an advantage because it helps to compress the logs and make the walls more draught-proof. In winter the total load may well increase to 400 or 500 kg per m2 because of snow. Sod is also a reasonably efficient insulator in a cold climate. The birch bark underneath ensures that the roof will be waterproof.

The sod house or soddy was an often used alternative to the log cabin during frontier settlement of the Great Plains of Canada and the United States in the 1800s and early 1900s. Primarily used at first for animal shelters, corrals, and fences, if the prairie lacked standard building materials such as wood or stone, sod from thickly-rooted prairie grass was abundant, free, and could be used for house construction. Prairie grass has a much thicker, tougher root structure than a modern lawn.