The disclosure generally relates to an adjustable foundation and bed, in particular having a low vertical profile while maintaining a full range of motion for articulation of its various deck support sections. In various embodiments, a deck support section of an adjustable bed can include an open area in the deck support surface. The open area is positioned relative to an actuator mounted beneath the deck support section and support surface such that a portion of the actuator occupies the open area during at least some of the normal range of motion of the actuator and corresponding deck support section. The additional space provided by the open area allows inclusion of an otherwise bulky actuator mechanical component in a vertically smaller space, permitting the adjustable bed to have an overall lower vertical profile.