Porous Roof Drought

Basically a green roof is just a roof that fosters vegetation growth.

Porous roof drought. Good time to do some p. The basic green roof consists bottom to top of a structural frame covered by a waterproof membrane an inorganic barrier layer that prevents roots from penetrating into the membrane a layer of gravel or thermoplastic material to provide drainage a layer of fibrous material for moisture retention and finally the porous planting. Types of green roofs. Spaceman s domes are built strong so they can withstand the extra weight of added moisture between long intervals of drought and drying.

However sometimes supplemental water is necessary to keep plants alive during drought episodes so the roof can function at its optimal level. The only way i. Next years fire season won t be as bad because undergrowth won t have as much water to grow. Irrigation may also be positive in terms of energy savings as evapotranspiration from a green roof surface not only helps moderate internal building temperatures but also may be a cost effective method.

History of green roofs. Roof gardens or intensive green roofs may be accessible and include water features and much larger plants. Types of green roofs extensive greenroofs lightweight drought tolerant self seeding vegetation plants replicate dry and semi dry grass conditions or rocky surfaces new up to 33 slopes existing structures not intended for recreation less costly. This has happened over years of drought.

Offering many advantages over conventional tar and metal roofs the sedum plants grow in a four layer vegetated mat rather than in loose soil. I don t fancy my chances with a highly porous roof material with a little added water soluble binder i can t see it has any realistic chance of keeping dripping wet out of the building. Due to the porous and well drained nature of the typical growing medium used in extensive green roof systems the success or failure of an extensive green roof is primarily dependent on a plant species ability to grow in the media. Planted with a drought resistant groundcover called sedum the living roof spans 454 000 square feet or 10 4 acres and it is one of the largest living roofs in the world.

Standard non porous roof choices. It is comprised of a medium for growing plants a drainage system a root barrier and a waterproofing layer.