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Question DetailsAsked on 11/11/2013

I need planting medium for a green roof. I already have the drain mat and some spunbound weedblock

I already bought the drain core mat and have at least some spunbound weedblock but I need a lightweight planting medium for the rest of it. The porch is flat , 22 FEET by 11 FEET and I was thinking about 3 inches, maybe, not sure. I need a nice lightweight medium, very little topsoil as it packs down and won't let any ground cover grow. I contacted someone in St. Louis who recommended lava rock. So far I have called a company or two in Philly but they play dumb when the find out you just want some info. One gal told me to buy it by the 1 pound bag and pretended not to understand I mean 22 feet by 11 feet. Yes really. I am at a standstill and I want to do this job next spring.

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1 Answer


I hope your roof was designed for planting on it - if not, you should have an architect or structural engineer assess the load first - even a few inches of growth medium will exceed safe load for a normal roof when it is saturated with wet snow or rain.

My second recommendation would be to start looking for a new place to live - I have never seen a green roof that was not a leak farm, causing significant damage to the building structure, mold issues, and wetting of personal possessions. Planting things on your roof falls in the category of those things that just are not smart to do - like sitting on the roof of your car, building campfires in the middle of your floor, burning creosote logs in your fireplace, and so forth.

Answered 6 years ago by LCD

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