Green Roof Sizing

Count the number of downspouts coming from your roof.

Green roof sizing.

You will need to express this size in terms of square feet. Simulations are available for new construction ashrae 90 1 2004 and old construction pre ashrae 90 1 2004 office and residential buildings driven by typical precipitation and. The green roof energy calculator is an online tool that allows users to compare the annual energy performance of a building with a vegetative green roof to the same building with either a dark roof or a white roof. Multiply the two figures together to obtain the square footage of your roof step 2 determine the percentage of water collected from each downspout p.

The venny green roof melbourne. The venny green roof has shallow substrates on two types of roof the first roof is on shipping containers and is designed for a dead load of 250kg m 2 and live load of 100kg m 2. Square foot 18lbs x 10 763 193lbs metre square 87 3kg ms 0 85kn m2. Step 1 determine the footprint of your structure f in square feet.

The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2. We have never done a green roof and have only briefly read up on them in the past but if your calculations are correct it would appear that you have a dead load of 0 85kn m2. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. Measure along the length of the house or building and along the width of the house or building in feet.

Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure. We list our calcs and possibly someone can confirm them. Expectancy of a green roof at 40 years versus 17 for a conventional roof. Photo by andrew wutke.

Feet of real estate an estimated 5 9 million square feet.