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I am planning a roof garden,any pre-requisites to protect the ceiling?

I am planning a roof garden,any pre-requisites to protect the ceiling? ia m not sure how the work is executed, coz i dont want to see watermarks on my ceiling. how are roof gardens designed. what pre-requistes do we need to make?does this create stains and cracks to ceiling?

Public Comments

1. go with a hydroponics setup which would only be the weight of water and containers-and a lot less water than when using soil. or use a lighweight soilless mixture. or you can have a green roof which is nice but complicated and costly,using 5mil. plastic membranes btwn roof and several layers of soil/soilless mix.
2. I've not done it before, but... I know a company that specializes in green roofs. I hope that this helps. Check out their Web-site and E-Mail them.
3. you need an engineer to look at the structure of your building. roof gardens add alot of wieght to the structure. must have a rubber barrier to keep moisture from getting in.
4. This blog may help. http://geosynthetic.blogspot.com/search/label/Roof%20garden