Brian Kirsch I was unable to post as per your request....first and foremost I would avoid Mary Jo Aagerstouns advice.... I know the The Ballaja Infantry Barracks Building green roof in PR well, we were asked to consult / bid on it but walked away when they wanted to import growing media from the US. This was 2011 rhetorically speaking ask them what it looks like now and the issues since the install...From my perspective removing a green roof every time there is a threat of weather is not a solution. The design intent is clear. A lightweight Miami Dade approved application is in need provided....there is the loading capacity to accept the vegetation. Some of our roofs have been as low as 12 lbs per sf with 3 of our bioSoil, our system is designed around water retention, our system can be mechanically fastened to the roof with NO penetrations...etc..enough with my sales pitch....what I would avoid at ALL COSTS is a tray system. Its like having a bunch of mini green roofs. Pending what tray, there prob wont be water retention at all.....the few that do (trays) end up with water logged roots...aka root rot. In my professional opinion: 1. Is there enough loading available to account for another 20 - 25 lbs? If not stop planning or plan to add support. 2. Mechanically fasten to the roof with NO penetrations 3. Use the GLTi Green Living Roof Panels to meet the following criteria: a. Lightweight 12-18 lbs saturated b. Designed around water retention (8 gallons per 10.5 sf) c. Two levels of mechanical water retention (GLTi drain board and the GLTi water retention fabric) d. Separate the water retention from the root level to avoid root rot but still allow the stored water to be used by the plants. (GLTi basis of design) e. Use growing media blended with LOCAL materials! DO NOT import or use what is not natural to the environment. f. Use local plants...in this case Peanut is a good choice for ease and immediate coverage. So you see.....its not so simple but if done correctly a sub tropic green living roof is beautiful! Here are pics from GLTi Honduras and the best thing here is the GLTi system is so light we can install on top of corrugated roofing!
Posted on: Tue, 20 Jan 2015 02:50:12 +0000
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