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SCREEN, VINYL, GLASS & MODULAR ROOMS SECTION 3 Table 3.2.1 Allowable Upright Heights, Chair Rail Spans or Header Spans - Hollow Extrusions For Screen Rooms or Vinyl Rooms I Open or Partially Enclosed Structures Aluminum Alloy 6063 T -6 For 3 second wind gust at velocity of 120 MPH or an applied load of 14 # I sq. ft." Tributary Load Width W .. Puriln Spacing Sections 3'-0"' I 3'-6R I 4'-OR I 4'-6" 5'-0" I 5'-8" I 6'-0" I 6'-8" 7'-0" I 7'-6" Allowable Height 'H' I bending 'b' or deflection 'd' 2" x 2R x 0.0""" Hollow 7'-7' d 7'-2' d 6'-11" d 6'-6' b 6'-2' b 5'-11' b 5'-8" b 5'-5' b 5'-3' b 5'-1' b 2" x 2" x 0.055" Hollow 8'-0' d 7'-7" d 7'-4' d 7'-0' d 6'-9' b 6'.5' b 6'-2' b 5'-11' b 5'-8" b 5'-6' b 3" x 2R x 0.045" Hollow 8'-4' d 7'-11' d 7'-7' d 7'-4' d 7'-1' d 6'.10' b 6'-6' b 6'-3' b 6'-0' b 5'-10' b 2" x 3" x 0.045" Hollow 10'-5' d 9'-11'=- . .~9'-2' d 8'-10' d 8'-7' d 8'-4' d 7'-11' b 7'-8' b 7'-5' b 2" x 4" x 0.050" Hollow 14'-3' d 13'-4' b 12-6' b 11'-9' b 11'-2' b 10'-8' b 10'-2' b 9'-9' b 9'-5' b 9'-1' b 2" x 5" x 0.050" S.M.B. 19'-1 " d 18'-2' d 17'-4' b 16'-4' b 15'.6' b 14'-9' b 14'-2' b 13'-7' b 13'-1' b 12'-8' b 2" x 6" x 0.050" S.M.B. 22'-4' d 21 ',3' d 20'-0' b 18'-10' b 17'-11' b 17'-1' b 16'-4' b 15'-8' b 15'.2' b 14'-7' b . For Maximum hleghts at wind velocities other than 120 MPH, see Conversion Table 3B on the specification page for tables at the beginnIng of this section and example below. Note: For high velocity zones, convert to 130 MPH spans. Example: To calcualate maximum height 'H' at 140 MPH wind velocity for: 2' x 2' x 0.044' Hollow Extrusion with Load Width = 4' 1. Find 'H' at 120 MPH: H=6'-11' 2, Convert 'H' to decimal feet: H = 6'-11' = 6.92' 3 Select the appropriate multiplier from the conversion table 3A found on the specification sheet at the beginning of this section, - if the height is followed by 'b' use Bending multiplier - if the height is followed by 'd' use Deflection multiplier. 4 Multiply 'H' in decimal feet by appropriate multiplier. 'H' at 140 MPH is 6,11' x 0.92 = 5.62' = 5'-7" Lawrence E. Bennett, P. E. CIVIL ENGINEER. DEVELOPMENT CONSUL TANT P.O. BOX 4368, SOUTH DAYTONA, FL 32121 TELEPHONE (366) 767-4774 FAX (366) 767.aS56 SEAL @ PAGE COPYRIGHT 2001 NOT TO BE REPRODUCED IN WHOLE OR IN PART WITHOUT THE WRITTEN PERMISSION OF LAWRENCE E. BENNETT, P,E. 3-29