At long last, I have a living roof! I’ve been anticipating this day for over a year now and it’s finally done. On Monday, a group of about twelve folks assembled to help me lift sod onto the top of my roof, and in two and a half hours, it was effectively covered.
Soil Retaining Ladders
A few days prior to Monday, I made several soil “retaining ladders” using rope and some thin wood poles to help keep the soil in place. These poles were spaced a couple of feet apart to provide a brake for the soil from sliding down the roof. At some point I ditched the idea of using any loose soil on the roof in favor of entirely using sod, so these ladders became less important to me, but I left them up anyway.
Building the Living Roof
Since I already wrote about cutting sod for my roof, I will describe how the sod was loaded. Once the perimeter of the roof was covered with sod, we covered the rest of the roof. Doing the edge was the trickiest part, since I had the fold the EPDM underneath itself and leave a little bit exposed to protect the edge logs.
Once that was done, it was only a matter of lifting the material onto the roof. People worked at ground level to pass the turf up to folks on scaffolding and ladders, who then passed the material to others on the roof. The turf squares were packed closely together so that there were no gaps. If any awkward gaps could not be filled with sod squares, loose soil was loaded into cracks.
It was all fairly simple. Heavy heavy, but simple. I still have to load some sod up at the very top of the roof to completely cover the tractor tire skylight frame, but the roof is effectively done.
Planting the Living Roof
On the east side of the roof, I dumped several buckets of loose soil so that I could put in several strawberry plants. I mulched the strawberries with straw to help conserve moisture.
Eventually, I will plant wildflowers, grasses, and edible perennials on the roof, focusing on plants that are tolerant of drier soils and full sun. Since the sod is only about four inches thick, it is likely that the roof will dry out during high summer.
Although… yesterday was an incredible first test of the integrity of my living roof. At 6:30 p.m., we were warned of a tornado headed straight for Rutledge. Within 30 minutes, an inch and a half of rain had fallen, but thankfully the tornado turned at what felt like the last minute, and we were spared. It missed us by a mere 10 miles. I was happy to find that the soil remained intact on the roof, and none of the sod slipped. I didn’t see any signs of wear on the rafters, either. Success!
It will be interesting to see how the living roof ecology develops and changes over time. It will be especially nice once the individual sods root together and get totally established.
My Living Reciprocal Roof Formula
Here is my living reciprocal roof formula, in layers:
- 28 round pole rafters (black locust and pin oak, 14 primary, 14 secondary)
- black walnut wood decking (mostly 1-1.5x)
- muslin fabric
- double layer of cardboard
- four inch thick sod squares
And finally… a few more photos from the sod roof party: