Wednesday, September 10, 2008

Green roof progress photos

Above left, you can see Howard (orange shirt) and Pat (black shirt) from JIG laying the first layer of felt down on top the root barrier. Above right, you can see the framework for the roof deck which will lay on top of the felt adjacent the roof hatch. After the felt, they will lay down the drainage mats.

Here the guys get ready to lift the large white bags of "media" (dirt) up to the roof. The bags will be suspended above roof, opened up, and the dirt evenly spread out on top of the drainage mats. You can also see the orange protective covering on the electrical lines in the image on the right.

To the left is a detail shot of the scupper drainage box at the rear (low point) of the roof. There are 3 long triangular shaped "raceway" drains underneath the roof media that channel water directly to the drain in the event of heavy rain. Good thing too, since it started pouring about halfway through the media installation process. Pat said the drains worked beautifully and dirt retained just the right amount of water. You can also see the river stone drainage beds and metal edging at the rear edge and around the roof hatch and exhaust shaft. The wood to the far right is the edge of roof deck sleeper system.

All the dirt is down now and deck is in place. There is some final prep work with the edging and river stone before they lay the wind protection mat. If you look closely, you can see the small white ties coming out of the dirt that will hold the mat down. The plants have not arrive on site yet but are expected later in the day.

The roof is deck is not quite as big as we imagined it would be. It is 8' x 9' though, and should be enough to fit a small table and chairs or a couple of larger lounge chairs. In the end though, we think its a good size (relative to the overall area of the roof) because the bigger the deck gets, the less green roof there would be, which would end up being less cost effective and, seeing as there is no media under the deck, less effective with storm water management too.

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