Exterior and House Building Type “Durability drove the selection of metal panels,” Schaer says of the home’s industrial exterior. Manufactured by AEP SPAN from corrugated cladding, it looks like zinc but costs significantly less. It also contrasts nicely with the natural siding and trim. “All of the wood inside and out is Douglas Fir, the predominant wood species in the northwest,” Schaer explains.  Photo 1 of 11 in Seattle Home Carefully Blocks Out Neighbors, While Celebrating Natural Surroundings