A system comprising a first baseboard element, a second baseboard element, and a spline configured to couple with the first baseboard element and the second baseboard element. Another system comprising a first crown element, a second crown element, and a spline configured to couple with the first crown element and the second crown element. Other embodiments are disclosed herein.

A crown molding assembly that enables safely incorporating electrical and communications cabling within the crown molding by providing segregated compartments for electrical and copper communications cabling, wherein the decorative face is formed of a composite of fiber reinforcing polymer (FRP) including a fiber-reinforced structure having an increased directionality of said reinforcing fibers causing the decorative face to fracture upon being pierced by a fastener in a manner that renders the damaged section of the decorative face unable to hold the fastener, protecting the electrical cables and any other equipment located behind the decorative face from damage, and enables the secure installation of hardware either concealed within the molding or securely and favorably positioned through the decorative face to view or sense a room, and enables additional cable capacity that is concealed within a light reflector to increase lighting efficacy and power and data delivery capacity.

A system comprises a first baseboard element, a second baseboard element, and a spline configured to couple with the first baseboard element and the second baseboard element. Another system comprises a first crown element, a second crown element, and a spline configured to couple with the first crown element and the second crown element. Other embodiments are disclosed herein.