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A molding structure and associated method includes a baseboard and a seal. The baseboard has a front surface, a back surface opposite the front surface, and a bottom surface extending between the front and back surfaces, the back surface configured to be mounted against a wall, the bottom surface co

A molding structure and associated method includes a baseboard and a seal. The baseboard has a front surface, a back surface opposite the front surface, and a bottom surface extending between the front and back surfaces, the back surface configured to be mounted against a wall, the bottom surface configured to be positioned spaced apart from a floor adjoining the wall. The seal is mounted on the bottom surface of the baseboard and configured so that, when the molding structure is installed at a wall, the seal is compressed between the baseboard and a floor. The baseboard can include a channel along the bottom surface of the baseboard, and the seal can include a flange receivable in the channel to mount the seal to the baseboard. When the molding structure is installed, the baseboard can be separated from the floor and the seal can prevent flow of air between the baseboard and the floor.

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1. A molding structure comprising: a) a baseboard having a front surface, a back surface opposite the front surface, and a bottom surface extending between the front and back surfaces, the back surface proximate to the bottom surface configured to be mounted flush against a wall, the bottom surface

1. A molding structure comprising: a) a baseboard having a front surface, a back surface opposite the front surface, and a bottom surface extending between the front and back surfaces, the back surface proximate to the bottom surface configured to be mounted flush against a wall, the bottom surface configured to be positioned spaced apart from a floor adjoining the wall, the baseboard configured to be mounted to the wall; andb) a resilient seal mounted on the bottom surface of the baseboard and configured so that, once the molding structure is installed at a wall, the baseboard is spaced apart from the floor and the seal is in direct contact with the floor and compressed between the baseboard and the floor, the baseboard including a channel along the bottom surface of the baseboard, the seal including a flange receivable in the channel to mount the seal to the baseboard. 2. The molding structure of claim 1, wherein the channel and the flange are shaped so that the flange can be inserted into the channel to mount the seal to the baseboard. 3. The molding structure of claim 2, wherein the channel and the flange are T-shaped. 4. The molding structure of claim 2, wherein the channel and the flange are J-shaped. 5. The molding structure of claim 2, where the flange includes a plurality of ribs extending outwardly from the flange to provide a friction fit that secures the flange in the channel. 6. The molding structure of claim 5, wherein there is an acute angle between each rib and a side of the flange. 7. The molding structure of claim 6, wherein the acute angle is in the range of about 35 degrees to about 55 degrees. 8. The molding structure of claim 1, wherein the seal prevents the flow of air between the baseboard and the floor when the molding structure is installed at a wall. 9. The molding structure of claim 1, wherein the seal is a bulb seal. 10. The molding structure of claim 9, wherein the bulb seal includes a flexible wall, defining a cavity, and a flat portion in contact with the bottom surface of the baseboard when the bulb seal is mounted to the bottom surface of the baseboard. 11. The molding structure of claim 10, wherein the bulb seal further includes a flexible projection extending from the flexible wall and the projection being capable of contacting the floor when the molding structure is installed. 12. The molding structure of claim 11, wherein the projection is curved so that the surface of the projection that is in contact with the floor is closer to the wall than the remainder of the projection. 13. The molding structure of claim 1, wherein the seal is a unitary piece of extruded silicone or polyvinyl chloride (PVC). 14. The molding structure of claim 1, wherein the bottom surface is the lowermost surface of the baseboard. 15. The molding structure of claim 1, wherein the height of the baseboard is substantially greater than the width of the baseboard. 16. The molding structure of claim 1, wherein the back surface is substantially planar. 17. The molding structure of claim 1, wherein the back surface and the bottom surface form a corner and are substantially perpendicular to each other at the corner. 18. A method of installing a molding structure including a baseboard and a resilient seal, the method comprising: a) placing the molding structure against a wall, the baseboard having a front surface, a back surface opposite the front surface, and a bottom surface extending between the front and back surfaces, the back surface configured to be mounted flush against the wall, the bottom surface configured to be positioned spaced apart from a floor adjoining the wall, the seal mounted on the bottom surface of the baseboard and configured so that, once the molding structure is installed at the wall, the baseboard is spaced apart from the floor and the seal is compressed between the baseboard and the floor, the baseboard including a channel along the bottom surface of the baseboard, the seal including a flange receivable by way of a friction fit in the channel to mount the seal to the baseboard;b) applying pressure to the baseboard to move it toward the floor and compress the seal; andc) with the seal compressed, mounting the baseboard to the wall so that the back surface proximate to the bottom surface is mounted flush against the wall. 19. The method of claim 18, wherein the seal is a bulb seal and the seal, once the molding structure is installed at the wall, is in direct contact with the floor. 20. The method of claim 18, wherein the bottom surface is the lowermost surface of the baseboard. 21. A molding structure comprising: a) a board having a front surface and a back surface opposite the front surface, the back surface configured to be mounted against a wall, the board further having a channel surface extending between the front and back surfaces and configured to be positioned spaced apart from a floor or ceiling adjoining the wall, the board including a channel along the channel surface; andb) a resilient seal mounted on the channel surface, the seal configured so that, once the molding structure is installed at the wall, the board is spaced apart from the floor or ceiling and the seal is compressed between the board and the floor or ceiling, and the seal comprising a flexible wall defining a cavity and a flange receivable by way of a friction fit in the channel to mount the seal to the board, at least a portion of the flexible wall comprising a substantially flat surface in contact with the channel surface when the flange is received by the channel,wherein the seal further includes a flexible projection extending from a proximal attachment to the flexible wall to a distal end of the projection, the projection being curved from the proximal attachment to the distal end. 22. The molding structure of claim 21, wherein the board is a baseboard and the seal is mounted on a bottom surface of the baseboard, the seal being compressed between the baseboard and the floor when the molding structure is installed at the wall. 23. The molding structure of claim 21, wherein the board is a crown molding and the seal is mounted on a top surface of the crown molding, the seal being compressed between the crown molding and the ceiling when the molding structure is installed at the wall.