The best of Stats Verde, 2007

Photo: istockphoto.com/Kristen Johansen

It's been a year of interesting facts about green building. Mallet Consulting, writing specialists for the green building industry, complied their favourite facts from 2007.

  • Average size of a new home in the US, 1970 and 2006, respectively, in sq ft: 1,400; 2,469
  • Number of people in the average US household, 1900, 1970 and 2002: 4.60, 3.11, 2.58
  • Amount of construction debris buried in US landfills annually, in tonnes: 112,000
  • Percentage of construction waste that is salvageable and reusable: 50
  • Percentage of construction waste that is recyclable: 45
  • Temperature of the roof membrane of a standard asphalt roof on a 35 ºC day: 70ºC
  • Temperature of the roof membrane of a vegetated roof on same day: 25ºC
  • Average daily energy demand for heating and cooling of the asphalt-covered building, in BTUs: 20,500-25,600
  • Average daily energy demand for heating and cooling of the vegetated-roof building, in BTUs: less than 5,100
  • Average annual domestic water use per capita, Canada, in litres: 122,000
  • Average annual domestic water use per capita, France, in litres: 54,800
  • Estimated percentage of Canadian domestic water used for toilet flushing: 30
  • Average annual rainfall harvestable from 6m x 10m roof in Vancouver, in litres: 66,000
  • Number of Volatile Organic Compounds found in 100% of 100 randomly selected office buildings in the US, 1994-1998: 25
  • Number of additional Volatile Organic Compounds found in 75-99% of above buildings: 18
  • Estimated percentage of home-to-work commuting trips taken by bicycle, US: 0.4
  • Estimated percentage of home-to-work commuting trips taken by bicycle, Canada: 1.2
  • Estimated percentage of home-to-work commuting trips taken by bicycle, Netherlands: 27
  • Relative efficiency of bicycles to cars, in distance travelled per calorie: 50:1
  • Annual number of trips on public transit per capita in European cities larger than 1,000,000; 500,000-999,999; 250,000-499,999, respectively, 1999: 200.5, 171.3, 166.0
  • Annual number of trips on public transit per capita in Canadian cities larger than 1,000,000; 500,000-999,999; 250,000-499,999, respectively, 1999: 101.4, 52.5, 29.9
  • Annual number of trips on public transit per capita in US cities larger than 1,000,000; 500,000-999,999; 250,000-499,999, respectively, 1999: 42.3, 12.3, 5.8
  • Average fuel economy of a new car in the EU, Canada, US and Japan, respectively, 2002, in mpg: 37.2, 25.6, 24.1, 46.3