Low amplitude cyclic vertical motions of flat floors that humans find unacceptable are commonly caused by impacts resulting from their own activities or those of other people. It is therefore a goal of engineering design to identify and avoid construction methods prone to creation of motions that make floors unserviceable for an intended type of building occupancy. In some instances use of engineered wood products as construction materials results in floors having unacceptable vibration performances. Usually this is because floors exhibit modal frequencies and mode shapes that cause human perceptory organs to resonate or accelerate. This paper addresses vibration response characteristics of one-way spanning floors constructed using widely spaced glulam beams and transverse glulam deck elements. The vehicles for gaining understanding of such systems are experiments and finite element models.