The result of their collaboration is an environmental award winner. Materials are healthful, green, energy-efficient, or all three. Recycled items―Douglas fir floors, spruce and fir walls, and beams and columns―come from the original structure, salvage centers, even an old boat. Where Tinker didn’t use reclaimed wood, he chose formaldehyde-free cabinetry and doors; concrete and pre-finished, engineered wood flooring; and wheat board, a product (made from pressed wheat) that’s similar to particleboard minus the formaldehyde. Tinker also opted for low-VOC paints and Energy Star–rated kitchen appliances, plus a plastic building material made from fast-growing pine-wood fiber and non-gas-emitting resin.