Green Roof Sizing

Expectancy of a green roof at 40 years versus 17 for a conventional roof.

Green roof sizing.

The first step in a free roofing estimate is measuring the roof dimensions. Divide 100 by the number of downspouts in order to obtain the percentage of water collected from each downspout. Feet of real estate an estimated 5 9 million square feet. 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.

Count the number of downspouts coming from your roof. 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. You will need to express this size in terms of square feet. Square foot 18lbs x 10 763 193lbs metre square 87 3kg ms 0 85kn m2.

In the national capital region if green roofs were to replace conventional roofs on all 54 million square. 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. United states department of transportation headquarters washington dc.

Step 1 determine the footprint of your structure f in square feet. The venny green roof melbourne. 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. Photo by andrew wutke.

The second trussed roof is designed for a dead load of 160kg m 2 and a live load of 40kg m 2.