Nordic houses have grass on the roof for several reasons. First, the roofs provide a habitat for birds to build their nests and for insect colonies to reproduce. The vegetation on the roof also helps to absorb rainwater, reducing the amount of runoff and decreasing the risk of flooding. Additionally, the grass and plants on the roof provide insulation, keeping the house cooler in the summer and warmer in the winter. According to the Scandinavian Green Roof Institute, the amount of runoff that can be reduced varies depending on the design of the roof, the species of plants used, and the pitch of the roof. However, it can be as much as 40 to 90 percent, making green roofs an environmentally-friendly and cost-effective choice for homeowners. Here are some benefits of having a grass roof:
Provides habitats for birds and insects
Reduces the amount of stormwater runoff
Improves insulation, keeping homes cooler in summer and warmer in winter
Reduces energy costs and saves money
Improves air quality by absorbing carbon dioxide and producing oxygen
Increases the lifespan of the roof by protecting it from the elements
Provides an attractive and unique aesthetic to a home
All of these benefits make having a grass roof a wise and worthwhile investment for any homeowner.