Instead of taxing the taps, the home’s drought-tolerant garden can be watered with runoff from the roof. Krubiner’s technology of choice: Rainwater Hog, an off-the-shelf, expandable system of rainwater collection tanks that stores water for irrigation. Because the Hogs are slim, they can be positioned directly under a downspout without blocking the walkway—a necessity on a tight city lotlike this. “The nice thing is that you can easily link them together,” says Krubiner. This will come in handy if he ever needs more, but so far his two sets of five 50-gallon Hogs are enough for the property.
It makes sense for a modular home building company to use products that are broken into smaller pieces. That was indeed the logic behind Krubiner’s decision to implement four-inch-deep, two-foot-square trays from Green Roof Outfitters into the two roof gardens. Because the 100-percent-recycled-material trays were cleverly designed with built-in handles, “you can remove them if you need to get to the roof itself,” says Krubiner. He’ll be filling the trays with Sedum Tile mats from Etera, which come preplanted with a colorful array of succulents sturdy enough to withstand the roof’s hot sun and the region’s dry summers.