Patio enclosure

1. A room structure for attachment to a building wall, the room structure having an upright frame assembly including an upper end and formed by at least one enclosure wall and a roof structure extending between the exterior wall and the upper end of the frame assembly, the frame assembly including at least one vertically disposed axially elongated support member, the support member comprising:

an assembly of an I-beam and a closure member, the I-beam and the closure member being of substantially the same axial length;

the I-beam and the closure member each being unitary and comprised of a single piece of a non-metallic composite material;

the I-beam being axially elongated and having a central body and a pair of transverse flanges, the flanges each having a pair of opposed outer edges positioned away from the central body, the flanges and the central body defining oppositely facing squared-C shaped channels; and

the closure member being axially elongated and comprising a base wall, a pair of sidewalls, and at least one support wall, the sidewalls extending from opposite edges of the base wall and the at least one support wall upstanding from a medial location along the base wall;

wherein the closure member is snap-fitted in a friction fit into the squared-C channel of the I-beam to substantially close the channel and in a manner that the base wall of the closure member and the outer edges of the flanges of the squared-C channel into which the closure member is interfitted are substantially coplanar.

2. The room structure according to claim 1 , wherein the central body of the I-beam is hollow and defines a substantially rectangularly-shaped passageway.

3. The room structure according to claim 1 , wherein the I-beam and the closure member each comprise a PVC plastic material and a cellulosic material.

4. The room structure according to claim 1 , wherein the frame assembly comprises an axially elongated base track having a base member and a pair of opposed arms, the base member having opposed lateral edges and the opposed arms being spaced apart and disposed thereon, the arms and the base member defining a track.

5. The room structure according to claim 1 wherein the frame assembly comprises an axially elongated corner post, the corner post having four walls which intersect to define a substantially square-shaped central opening and a pair of outwardly open squared-C shaped channels.

6. The room structure according to claim 1 wherein the I-beam and the closure member define an elongated access space therebetween, wherein the access space contains electrical wiring.

7. A room structure for attachment to the exterior wall of a building mounted on a foundation adjacent to said wall, said room structure comprising an upright frame assembly having an upper end and formed by at least one enclosure wall and a roof structure extending between said exterior wall and the upper end of said frame assembly, said frame assembly including at least one vertically disposed support member, the improvement wherein

said support member comprises an assembly of an H-beam and a closure member,

each said closure member and H-beam being comprised of a single piece of composite material and having substantially the same vertical height,

said H-beam being formed by a spacer wall and a pair of webs, the spacer wall extending between the webs and disposed inwardly and between the outer edges of the webs wherein to form a pair of outwardly open squared-C channels, and

said closure member being formed by a pair of sidewalls and a base wall, the sidewalls extending from opposite edges of the base wall wherein to form a squared-C cross-section, the closure member being snap-fittable in a friction fit into one of the squared-C channels of the H-beam to substantially close said channel and in a manner that the exterior base wall of the closure member and the edges of the webs of the squared-C channel into which the closure member is interfitted are substantially coplanar.

8. The room structure according to claim 7 , wherein the spacer wall of said H-shaped beam is centrally apertured, the aperture extending between the opposite ends of the beam.

9. The room structure according to claim 7 , wherein the H-shaped beam and C-shaped closure member are extruded from a composite PVC plastic.