Averages for Oslo in January. Oslo is geographically located at the northern end of Oslo Fjord in Norway. The city is surrounded by forests, lakes, and mountains, which cover two thirds of Oslo. The largest island, closest to Oslofjord is Malmya.
Roofs: Slate, copper and tile roofs can last more than 50 years. Homeowners with wood shake roofs should expect them to last about 30 years, while fiber cement shingles last about 25 years and asphalt shingle/composition roofs last about 20 years, the NAHB found.Climate and weather conditions, such as snow, hail and hurricanes, can cut the life span of all types of roofs.omeowners with wood shake roofs should expect them to last about 30 years, while fiber cement shingles last about 25 years and asphalt shingle/composition roofs last about 20 years, the NAHB found.
Old roof has structural issues requiring significant repair or renovation. If corrective measures are extensive, the cost of fixing a flat roof may be close to the cost of converting to a pitched roofâor close enough. Roofing may last longer. In theory, roofing on flat roofs can last as long as standard materials on sloped roofs, but in reality, roofing on houses with pitched roofs has greater longevity, on average.