Pounds Per Square Foot For Green Roof

Annual maintenance costs.

Pounds per square foot for green roof.

Its dry weight is 12 pounds per square foot and its wet weight is 18 pounds per square foot. Semi intensive green roofs require a bit more maintenance since the plants tend to need pruning irrigation and fertilization. The dead load of a typical asphalt shingled wood framed roof is about 15 pounds per square foot. The additional weight of people on the roof must also be factored into the load calculations for a green roof.

Our green roof assemblies can be used in basic flat roof applications as well as more dynamic roof structures even on slopes up to 45 degrees. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. Note that roof systems typically include more than one type of material. You calculate this in pounds per square foot or usually abbreviated as psf.

Semi intensive systems generally weigh between 25 and 40 pounds per square foot when dry. The load increases with the use of heavier roofing material. Intensive which can hold up to 150 pounds per square foot and typically support more diverse types of plants but also requires more maintenance and extensive able to support up to 25 pounds of vegetation per square foot and usually grown naturally and without restriction needing only yearly. Today green roofs comes in two primary forms.

Xeroflor s green roof options include a range of lightweight systems from only 8 10 pounds per square foot to applications of 31 pounds per square foot. The fourth modular green roof system installed in 2008 was biotrays by green roof solutions. The foot or more of growing medium needed for an intensive green roof creates a load of 80 150 pounds 36 68 kilograms per square foot. They support hearty native ground cover that requires little maintenance.

The epa estimates that the cost of installing a green roof starts at around 10 per square foot for simpler extensive roofing and 25 per square foot for intensive roofs. The ibhs also notes one inch of ice equals one foot of snow. The 800 square foot green paks system lies atop a root barrier and drainage mat and costs about 22 per square foot to furnish and install. They are typically constructed in layers but can also be installed using a tray system.

Pounds per square foot lb ft 2 pounds per square 100 sq. A clay tiled roof may have a dead. A more typical extensive roof with 3 to 4 inches of growing medium weighs 17 to 18 pounds per square foot and a deeper intensive system can weigh 35 pounds or more per square foot.