Indoor air quality (IAQ) was not priority No. 1 for Virginia Ranch Development project manager Davis Johnson as he oversaw construction of an 800-home community in Gardnerville, Nev., near Carson City. It seldom is. Like just about everybody else in the business right now, Johnson's biggest concern was lowering costs and bringing the project in on time.Bent on efficiency at every turn, Johnson and Derwin Bass, the project's chief architect, came up with an engineering, design, and construction plan that would cut back on site excavation and result in less trucking of materials to and from worksites, less labor, less concrete, all in less time. It was an inadvertent bonus when the two men realized that, in their ferocious effort to save money, their plan would also achieve higher indoor air quality in each new home.