“We like natural materials—we try to avoid petroleum or plastics in our products,” says Siegel, explaining his firm's switch to Cocoon insulation made from old newspapers. The insulation can be sprayed in wet or blown in dry, is fire resistant, and comes with a lifetime warranty. U.S. GreenFiber, 888.592.7684; www.cocooninsulation.com.

  Henry Siegel, FAIA siegel & strain architects

www.siegelstrain.com
emeryville, calif.