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SOME ASSEMBLY REQUIRED – The Hands-On Handbook 4 5 6


Roll out and cut the liners. The author applied a double layer of heavy polyethylene pool liners. Each liner is cut 5” long on all sides, so that it can overlap the edge and be integrated with fl ashing (see next steps).


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Prepare gutters. The cutoff section of the liners is used to waterproof the gutter. Note that the main liners (left) should overlap the gutters, not vice-versa.


Underlap fl ashing. Where the new green roof abuts the side of the house, the liner is tucked up under the lead fl ashing.


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Add gravel. A load of small gravel aggregate is spread over the liners, just enough to cover the entire surface.


Install a root membrane. Now spread out the root membrane over that gravel surface. This membrane is intended to act as a barrier to keep plant roots from tearing up the actual waterproofi ng liners below.


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Add more layers. Next, you will add another layer of gravel on top of the root membrane, (a layer hidden in this photo) followed by a moisture blanket. Cover the moisture blanket with more small gravel, leaving a 6”-8” space clear around the perimeter of the blanket.


Continued on next page


Add rocks. Add larger stones around the perimeter of the roof, and use fl ashing tape to wrap the edges of the pool liners over the edge of the roof and seal them.


Add compost. Deposit a couple of inches of seasoned compost that will serve as growing medium.


Project courtesy of William Morrish


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