Exploratory research related to the effectiveness of layered composite solid wood-concrete floor systems is described. Rectangular beams comprised of a concrete layer atop a solid dimension lumber layer were load tested. Interlayer force transfer is accomplished by bearing in a notched shear key. A vertical anchor is utilized to restore tightness of the notch after the concrete cures. Test results indicated the structural merit of the concept based on the degree of partial composite action achieved. (C) 2007 Elsevier Ltd. All rights reserved.