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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 ~ For 3 second wind gust at velocity of 120 MPH or an applied load of 14 # I SQ. ft.. Tributary Load Width W = Purlln Spacing Sections 3'.{I"' T 3'~" 4'.{I" 4'~" I 5'.{I" I 5'~" 6'.{I" I 6'~" T T' .{I" T'~" Allowable Height 'H' I bending 'b' or deflection 'd' 2" x 2" x 0.044" 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 2" 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'-{)' b 5'-10' b 2" x 3" x 0.045" Hollow 10'-5' d 9'-11' d 9'-6' d 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' Ii 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" 8,M.B. 22'-4' d 21'-3" d 20'-{)" 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 veloclly zones, convert to 130 MPH spans Example: To calcualate maximum height 'H' at 140 MPH wind velocity for: 2" x 2" x 0044" 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.H2' 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 Ih" bAlghl is followed by 'd' use Deflection multip~er 4 Multiply 'H' In decimal feet by appropriate multiplier '11' ill 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 (386) 767-4774 FAX (386) 767-&56 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