There's no way to avoid construction moisture completely, so Lstiburek recommends, in addition to the strategies outlined above, that builders use a ventilator or dehumidifier to remove moisture during construction. "Using a ventilator or dehumidifier will get the moisture out of the foundation, floor, and wood," he said. Builders should aim for moisture content of less than 15 percent in wood and a relative humidity rating during construction of less than 70 percent.