Green Roof Insulation

Green Roof Gardens are becoming an increasingly popular roofing option for concrete roofs, with many modern cities demanding a percentage of total roof space be green. A green roof is a roof surface, flat or pitched, that is planted partially or completely with vegetation and a growing medium over a waterproof membrane. It increases thermal mass and improves insulation, creating more stable temperatures in the building below and therefore reducing energy demands for artificial heating and cooling, reduces noise, increases productive garden space and biodiversity, provides beautiful views, reduces the rainwater run-off that ends up in stormwater systems, and improves air quality. 

Green Garden Roofs provide very low insulation from the soil and plants, especially when wet for adequate R-values, added insulation is needed. Foamular Extruded Polystyrene is a closed cell board with minimal water absorption and high R-values. It is placed below the soil but above the concrete roof, creating a continuous thermal barrier. It can also have pavers and ballast placed on it, providing walkways and recreation areas, as seen on the PRMA page.

Foamular Extruded Polystyrene provides no nutritional value to plants, animals or bacteria, so it is not degraded by their presence. It also has very low water absorption potential, and can easily function in the presence of moist growing medium and water runoff.

Foamular Extruded Polystyrene's high compressive strengths means it is not affected by continuous pressure from foot traffic, growing medium or other loads. Austech has a range of compressive strengths available that can deal with heavy loads, including vehicular traffic.


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