Abstract: An architectural molding assembly is comprised of straight molding pieces having a decorative outer surface and a channel in the rear surface thereof. A wall attaching plate is slidingly secured in the channel and has a slot or an aperture therein to engage with a fastener which is secured to a wall. The fastener may be in the form of a screw or a clamp having a projecting finger. When the attaching plates are engaged by the fasteners they are urged against the wall and maintained there under tension. No nail is inserted in the molding and molding connecting pieces and accordingly the assembly can be easily dismantled and remounted when desired.