A flexible inside corner trim piece is formed with concave depressions at hinge portions where wings attach to the body. The trim piece can be formed such that wings and a top cap lay flat in plane perpendicular to body or wings and top cap curve at an angle. Hinge portions can be narrow or wide and symmetrical or asymmetrical. The trim piece can be dyed, paintable, or present another decorative surface. The trim piece can include embedded lighting.

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 construction element is provided for forming a corner of a surface of a building, the surface including wall panels attached to framing studs. The construction element includes: a corner-forming surface that that is shaped to extend, in a cross-sectional view, between two separate wall panels, such that ends of the corner-forming surface, as viewed in the cross-sectional view, substantially match respective corners of the wall panels; and a fastener strip that, in a state in which the corner-forming surface is in its installed position with respect to the framing studs, is substantially parallel to one or more of the framing studs, such that a fastener can attach the fastener strip to one or more of the studs without passing through the wall panel.

In one embodiment, 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. In another embodiment, a 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. In another embodiment, a system comprises a crown spline, a baseboard spline, and a wall element configured to be coupled with the crown spline and the baseboard spline. Other embodiments are disclosed herein.

A construction element is provided for forming a corner of a surface of a building, the surface including wall panels attached to framing studs. The construction element includes: a corner-forming surface that that is shaped to extend, in a cross-sectional view, between two separate wall panels, such that ends of the corner-forming surface, as viewed in the cross-sectional view, substantially match respective corners of the wall panels. The construction element may be provided in multiple sections that are placed end to end and connected together.

An adhesive backed window trim bendable and divisible along a hinge separating the trim into two strips with score lines in each strip. A nub is formed along the side edges of the window trim for use in providing a finished edge concealing the adhesive when the undivided trim or the trim strips are used during installation of a replacement window or the like. The trim is co-extruded from a rigid PVC and plasticized PVC with shallow furrows on the rear face forming the score lines.

There is disclosed an improved wall panel trim reveal system and method which utilizes a set of vertical, horizontal and corner trim pieces designed to be fitted together. In an embodiment, the system includes horizontal trim pieces having at least one slope, vertical trim pieces having at least one tab forming a slot for receiving one or more horizontal trim pieces therein, wherein the horizontal and vertical trim pieces when installed together with wall panels forming a moisture drainage channel to direct moisture away from the wall.

A formable trim strip for use in connection with drywall applications includes two or more layers, including a trim strip body and a backing paper. The trim strip body extends along a body axis and has a top surface and a bottom surface. The trim strip body comprises a polymer material. The backing paper includes a portion secured to the bottom surface of the trim strip body without an intervening layer of adhesive material. The trim strip body is coated onto the portion of the backing paper when a temperature of the trim strip body is within the melting point range such that the bottom surface of the trim strip body contacts the portion of the backing paper. As the trim strip body cools to a temperature below the melting point range, the portion of the backing paper bonds to the bottom surface of the trim strip body.

An inside corner backer board molding insert is provided. The molding insert includes a body formed by a rigid member. An arcuate portion disposed on a front side of the body extends longitudinally from an upper face to a lower face of the body. The arcuate portion defines a concave surface extending laterally from a first longitudinal edge to a second longitudinal edge. A pair of laterally extending walls extend perpendicularly relative to each other and intersect forming a corner edge disposed on a rear side of the body. The corner edge forms a right angle sized to engage an inside corner of a wall. Opposing sides of the body interconnect the arcuate portion to the laterally extending walls and include a width sized to receive a backer board flush thereagainst. A lip extending outwardly from and edge of the opposing sides provides a support surface for the backer board.

An acoustic seal for a sound flanking path between an interior architectural separation and a mullion. A seal body is configured as an elongated rail having a base rail portion and a side rail portion. The base rail portion has sides defining a first seal surface for engaging a first interior side of the mullion, and a second seal surface for engaging an end wall of the architectural separation. The side rail portion has sides defining a third seal surface substantially non-parallel with respect to the first seal surface for engaging a second interior side of the mullion, and a fourth seal surface in substantially coplanar relationship with the second seal surface for engaging the end wall of the architectural separation. The first and third seal surfaces may form an inside seal corner for enveloping an outside corner of the mullion defined by the mullion's first and second interior sides.