Method of forming a frame assembly

1. A method of forming a frame assembly comprising:

(a) providing a plurality of frame members, each frame member defining an interior space divided into at least three longitudinal cavities, wherein the at least three longitudinal cavities comprise first and second inner longitudinal cavities and an outer longitudinal corner key cavity, wherein the first and second inner longitudinal cavities are located adjacent each other in a transverse direction relative to the longitudinal cavities, and wherein the outer corner key cavity at least partially overlaps both the first and second inner longitudinal cavities in the transverse direction;

(b) providing at least one corner key, wherein each corner key has a first section and a second section, wherein each section of each corner key is configured to fit into one end of one of the outer corner key cavities; and

(c) engaging the corner key with adjacent ones of the plurality of frame members;

(d) wherein when the plurality of frame members are engaged together using one or more of the corner keys, the plurality of frame members define an outer boundary and an inner boundary, wherein the inner boundary defines an opening, wherein the outer corner key cavity is adjacent to the outer boundary and the first and second inner longitudinal cavities are located inwardly relative to the outer corner key cavity toward the inner boundary.

2. The method of claim 1 comprising the step of providing four frame members and four corner keys, wherein the frame members and the corner keys are configured so that when the frame members are connected to each other using the corner keys, the frame members form an enclosed rectangular opening and define 90 degree angles relative to adjacent frame members.

3. The method of claim 1 wherein each frame member has a 45 degree angle cut on both ends and the first section of the corner key forms a 90 degree angle with the second section of the corner key.

4. The method of claim 1 wherein each of the frame members is a unitary structure and is formed of one of vinyl, fiberglass, an extrudate, and aluminum.

5. The method of claim 1 wherein each frame member includes a first end portion and a second end portion that are angled relative to a longitudinal axis of the frame member.

6. The method of claim 1 wherein each frame member has a depth extending from a first face to a second face, wherein the corner key cavity extends across a majority of the depth of the frame member.

7. The method of claim 1 wherein each frame member defines at least four longitudinal cavities.

8. A method of forming a frame assembly comprising:

(a) providing a plurality of frame members, each frame member comprising a lineal member defining a plurality of transversely adjacent inner cavities and an outer area that defines at least a portion of an outer corner key cavity, wherein each frame member has a depth, and wherein the outer corner key cavity overlaps at least two of the transversely adjacent inner cavities and extends across a majority of the depth of the lineal member;

(b) providing at least one corner key; and

(c) joining adjacent ones of the frame members together using a corner key, wherein each corner key has a first section and a second section, and wherein each section of each corner key is configured to fit into the outer corner key cavity of adjacent lineal members, wherein the corner key is located adjacent an outer edge defined by the frame member and wherein, when the plurality of frame members are joined together using one or more of the corner keys positioned in the outer corner key cavities of adjacent lineal members, the plurality of lineal members define an outer boundary and an inner boundary, wherein the inner boundary defines an opening, wherein the corner key and the outer corner key cavity are adjacent to the outer boundary and the first and second inner longitudinal cavities are located inwardly relative to the corner key and the outer corner key cavity toward the inner boundary.

9. The method of claim 8 comprising providing four frame members and forming the four frame members into a frame assembly system using four corner keys, wherein the four frame members extend in orthogonal directions relative to adjacent frame members and define an outer perimeter and an inner perimeter, wherein the corner key cavity of each frame member is adjacent to the outer perimeter of the frame assembly system.

10. The method of claim 8 wherein the corner key cavity extends across less than the entire depth of the lineal member.

11. The method of claim 8 wherein each frame member has an angle cut on an end and the first section and second section of the corner key are oriented at an angle relative to one another that is the sum of the angles associated with the angle cut on ends of adjacent frame members.

12. The method of claim 8 wherein each frame member is formed of a material selected from the group consisting of fiberglass, vinyl, an extrudate, and aluminum.

13. The method of claim 8 wherein each frame member has a depth extending from a first face to a second face, and the corner key cavity extends across at least about 70% of the depth of the frame member.