Header arrangement

1. A header arrangement comprising: an elongated, lower, substantially horizontal flange having a U-shape and for engaging a wall structure along at least part of a length of the lower flange; an elongated, substantially vertical web connected along and extending upwardly from the lower flange; and an elongated, upper, substantially horizontal flange connected along an upper edge of the vertical web and having a U-shape; the lower and upper flanges and the vertical web together forming a header beam and together creating a pair of polygonal pockets on opposite sides of the vertical web, the arrangement including at least one substantially U-shaped end stiffener connected to one end of the header beam and shaped to cover an end of the pair of pockets, the end stiffener having a pair of spaced apart vertical rails, and a wall plate connected between the vertical rails, the wall plate including a Z-shaped portion adapted to engage a similar Z-shaped portion of a wall panel under the header arrangement.

2. The header arrangement of claim 1 , wherein the lower and upper flanges and the vertical web are formed of a pair of mirror members which each have part of each flange and a vertical web panel, the vertical web panels being coextensive with respect to each other and being connected to each other to form the vertical web.

3. The header arrangement of claim 1 , wherein the lower and upper flanges and the vertical web are made of sheet metal and the U-shape of the upper and lower flanges are both downwardly open.

4. The header arrangement of claim 1 , wherein the lower and upper flanges and the vertical web are made of sheet metal and are formed of a pair of mirror members which each have part of each flange and a vertical web panel, the vertical web panels being coextensive with respect to each other and being connected to each other to form the vertical web, the U-shape of the lower and upper flanges both being downwardly open.

5. The header arrangement of claim 1 , including at least one web stiffener connected to at least one of the flanges and extending into one of the pockets for bracing the flanges and the vertical web.

6. The header arrangement of claim 1 , including a plurality of web stiffeners each connected to at least one of the flanges and each extending into at least one of the pockets for bracing the flanges and the vertical web.

7. The header arrangement of claim 1 , including a plurality of web stiffeners each connected to at least one of the flanges and each extending into at least one of the pockets for bracing the flanges and the vertical web, the lower and upper flanges and the vertical web being made of sheet metal and being formed of a pair of mirror members which each have part of each flange and a vertical web panel, the vertical web panels being coextensive with respect to each other and being connected to each other to form the vertical web, the U-shape of the upper and lower flanges being downwardly open.

8. The header arrangement of claim 1 , wherein the lower and upper flanges each have outer elongated edges with a downwardly extending flange plate forming at least part of each U-shape, the arrangement including a plurality of web stiffeners each connected to at least one of the flanges and each extending into at least one of the pockets for bracing the flanges and the vertical web, each stiffener comprising an outer plate that is vertically long enough to span the distance between the flange plates of the upper and lower flanges, the flange plates of both of the upper and lower flanges being connected to the outer plate, each stiffener further comprising a pocket plate connected to each opposite vertical edge of the outer plate and being shaped and sized to extend into one of the pockets, in close proximity to, or in contact with surfaces of the flanges and of the vertical web in the pocket.

9. The header arrangement of claim 1 , wherein the lower and upper flanges each have outer elongated edges with a downwardly extending flange plates plate forming at least part of each U-shape, the arrangement including a plurality of web stiffeners each connected to at least one of the flanges and each extending into at least one of the pockets for bracing the flanges and the vertical web, each stiffener comprising an outer plate that is vertically long enough to span the distance between the flange plates of the upper and lower flanges, the flange plate of at least one of the upper and lower flanges being connected to the outer plate, the stiffener further comprising a pocket plate connected to each vertical edge of the outer plate and being shaped and sized to extend into one of the pockets, in close proximity to, or in contact with surfaces of the flanges and the vertical web in the pocket.

10. The header arrangement of claim 1 , the U-shape of the upper flange being upwardly open and the U-shape of the lower flange being downwardly open.

11. The header arrangement of claim 1 , the U-shape of the upper flange being formed by a pair of upwardly extending flange plates and being upwardly open and the arrangement including at least one web stiffener connected to at least one of the flange plates and extending into the pocket for bracing the flanges and the vertical web, the U-shape of the lower flange being downwardly open.

12. The header arrangement of claim 1 , the U-shape of the upper flange being upwardly open and the arrangement including at least one web stiffener connected to at least one of the flanges and extending into the pocket for bracing the flanges and the vertical web, the stiffener comprising an outer plate that is vertically long enough to span the distance between the flange plates of the upper and lower flanges, the flange plates of both of the upper and lower flanges being connected to the outer plate, each stiffener further comprising a pocket plate connected to each vertical edge of the outer plate and being shaped and sized to extend into one of the pockets, in close proximity to, or in contact with surfaces of the flanges and the vertical web in the pocket, the U-shape of the lower flange being downwardly open.

13. The header arrangement of claim 1 , including an L-shaped cover plate connected to at least one of the upper and lower flanges for covering at least part of one of the pockets.

14. A header arrangement comprising: an elongated, lower, substantially horizontal flange having a U-shape and for engaging a wall structure along at least part of a length of the lower flange; an elongated substantially vertical web connected along and extending upwardly from the lower flange; and an elongated, upper, substantially horizontal flange connected along an upper edge of the vertical web and having a U-shape; and wherein the lower and upper flanges and the vertical web together form a header beam and together create a pair of polygonal pockets on opposite sides of the vertical web, the arrangement including at least one substantially U-shaped end stiffener connected to one end the header beam and shaped to cover an end of the pair of pockets, the end stiffener having a pair of spaced apart vertical rails and a wall plate connected between the vertical rails, the wall plate including a Z-shaped portion, the arrangement further including a wall panel under the header arrangement with a similar Z-shaped portion for engaging the Z-shaped portion of the end stiffener, the end stiffener being long enough to extend the entire vertical height of the header beam and to extend over at least some of a side of the wall panel for bracing the header beam against side load and twisting.

15. A header arrangement comprising: an elongated lower, substantially horizontal flange having a U-shape and for engaging a wall structure along at least part of a length of the lower flange; an elongated substantially vertical web connected along and extending upwardly from the lower flange; and an elongated, upper, substantially horizontal flange connected along an upper edge of the vertical web and having a U-shape; and wherein the lower and upper flanges and the vertical web together form a header beam and together create a pair of polygonal pockets on opposite sides of the vertical web, the arrangement including at least one substantially U-shaped end stiffener connected to one end the header beam and shaped to cover an end of the pair of pockets, the end stiffener having a pair of spaced apart vertical rails and a wall plate connected between the vertical rails, the wall plate including a Z-shaped portion, the arrangement further including a U-shaped wall panel under the header arrangement with a Z-shaped portion for engaging the Z-shaped portion of the end stiffener, the wall panel having a lower end and the arrangement including a gusset plate connected to the lower end of the wall panel for reenforcing the wall panel.

16. A header arrangement comprising: an elongated, lower, and substantially horizontal flange having a downwardly open U-shape for embracing a wall structure along at least part of the length of the lower flange; an elongated, substantially vertical web connected along and extending upwardly from the lower flange; and an elongated, upper, and substantially horizontal flange connected along an upper edge of the vertical web and having a U-shape, the lower and upper flanges each having outer elongated edges with a downwardly extending flange plate forming at least part of each U-shape, the flanges and the vertical web together forming a pair of polygonal pockets on opposite sides of the vertical web, the arrangement including a plurality of web stiffeners each connected to at least one of the flanges and each extending into at least one of the pockets for bracing the flanges and the vertical web, each stiffener comprising an outer plate that is vertically long enough to span the distance between the flange plates of the upper and lower flanges, the flange plates of both of the upper and lower flanges being connected to the outer plate, each stiffener further comprising a pocket plate connected to each vertical edge of the outer plate and being shaped and sized to extend into one of the pockets, in close proximity to, or in contact with surfaces of the flanges and the vertical web in the pocket; and wherein the lower and upper flanges and the vertical web together form a header beam, the arrangement including at least one substantially U-shaped end stiffener connected to one end the header beam and shaped to cover an end of the pair of pockets the end stiffener having a pair of spaced apart vertical rails and a wall plate connected between the vertical rails the wall plate including a Z-shaped portion, the arrangement further including a U-shaped wall panel under the header arrangement and extending along one side of a window, the wall panel having a Z-shaped portion for engaging the Z-shaped portion of the end stiffener, the wall panel having a lower end and the arrangement including a gusset plate connected to the lower end of the wall panel for reenforcing the wall panel.

17. The header arrangement of claim 16 , wherein the arrangement is adapted to extend over a window, the arrangement including a downwardly U-shaped sill track for engagement over a lower wall portion forming a lower end of the window.