I'm interested in green roofs, particularly retrofitting existing roofs with a plant layer. One of the trickiest problems, besides the plant issues, is figuring out how much weight a roof can bear. This is crucial, not only for figuring out your planting plan, but also to make sure that winter snow isn't going to cave in the roof. Are there good rules of thumb out there to estimate this?
Answers:
I saw a show on HGTV a few weeks ago. I caught it after they had built the eco roof. It looked like they used extra braces and such. I am sure you can call some companies that specialize in this.
The most important criteria in designing an eco-roof is to ensure that the structure is strong enough to support the additional wet weight of the soil and plants (approximately 10 to 25 pounds per square foot). Calculations proving that that there is adequate support are required. In general, an existing building with a gravel-rock flat roof will support 10-12 pounds per square foot. This was based on an article for the state of Oregon.
Other answers:
why to trees grow leaves?
What should I get friends for a housewarming gift- small apartment!?
heads on venus flytrap turn black before they even form, any help?
some people in my apt building have a mold problem its really bad so they moved?
Are there any products to eliminate silverfish coming from the water drains and in kitchen cabinets?
does anyone know where i can buy a Winnie the Pooh Tree Skirt.?
Does Anyone own.?
I found a red and black striped snake in my yard and I want to know if its venomous?I simply chock-full the pool near economically marine and it have rust within it . How do I get hold of rid of this to clear the marine?