Abstract:
I-beam studs of sheet metal have overlapped shaftwall portions having holes to provide for flow of cooling air along the overlapped portions to prevent failure of the studs from fire. First drywall sheets are mounted in the studs on the shaftwall sides thereof, and second drywall sheets are secured to the studs at the corridor sides thereof.

Description:
DESCRIPTION 
     This invention relates to an improved shaftwall, and has for an object thereof the provision of an improved shaftwall. 
     Another object of the invention is to provide a shaftwall having metal studs having ventilating apertures in overlapped portions thereof. 
     A further object of the invention is to provide an improved metal stud for a shaftwall, the stud being of sheet metal folded into an I-beam shape with an overlapping portion provided with ventilating holes spaced along one layer of the overlapping portion. 
    
    
     In the drawings: 
     FIG. 1 is a fragmentary, perspective view of an improved shaftwall forming one embodiment of the invention; 
     FIG. 2 is an enlarged fragmentary perspective view of a stud of the shaftwall of FIG. 1; 
     FIG. 3 is an enlarged, horizontal, sectional view of the stud; 
     FIG. 4 is an enlarged, fragmentary, horizontal sectional view of the stud; 
     FIG. 5 is an enlarged, fragmentary, vertical sectional view taken along line 5--5 of FIG. 1; 
     FIG. 6 is an enlarged, fragmentary, horizontal sectional view of an outside corner of the shaftwall of FIG. 1; 
     FIG. 7 is an enlarged, fragmentary, horizontal sectional view of an inside corner of the shaftwall of FIG. 1; 
     FIG. 8 is a fragmentary, horizontal, sectional view taken along line 8--8 of FIG. 1; and 
     FIG. 9 is an enlarged, fragmentary, horizontal sectional view of an end wall connection of the shaft of FIG. 1. 
    
    
     Referring now in detail to the drawings, there is shown therein an improved shaftwall forming a specific embodiment of the invention and including a side wall 10 having a shaft side 12 and a corridor side 14. The wall 10 includes novel I-beam studs 20 which are made by roll forming galvanized sheet metal. The studs include flanges 22 and 23 bent back on flanges 24 and 25 of a U-section 26. Spacer tabs 28 are provided for shaftwall (elevator and stairwall) construction and are ommited from housing wall construction. Bent over reinforcing edges 30 are provided on the free ends of the flanges 22 and 23. 
     In constructing the wall 10, top and bottom tracks 32 and 34 are fixed, an inner gypsum board 36 is slid into the tracks and into a corner member 38 or 39 or end member 41, the top track 32 having a narrower front flange 40 to permit the boards to be tilted into the lower track and then swung into the upper track. One of the studs 20 then is placed in the tracks and in position receiving the side edge portion of the board 36. The other boards 36 and studs are so positioned to form the inner wall. Then, outer gypsum boards 42 are secured by screws to the studs to complete the wall. In dry walls for houses, the tabs 28 are omitted and the boards are secured only to the flanges 22. Corner angle members 48 are provided for inside corners. 
     The portions of each of the flanges 22 overlapping one of the flanges 24 is provided with holes 50 therethrough to admit cooling air into a slight space forming a vertical passage 52 between the flange 22 and the flange 24. This gives a chimney effect to permit the air to travel through the holes and up the passages and out the tops of the studs to cool the studs and prevent excessive heat transfer. The holes, preferably, are of a diameter about one-half the width of the flanges 24 and are centered widthwise relative to the flanges 24. The holes, preferably, are spaced vertically about one foot apart along the studs starting near the bottoms of the studs. In one specific example, the holes were three-eighths of an inch in diameter, and the width of the flanges 24 was three-quarters of an inch.