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""""". -'- --;,~ SECTION 2 ATTACHED & FREESTANDING COVERS AND UTILITY SHEDS SEAL PAGE 70 . _F.1I1"....... Allowable Attributable Roof Area per Post for Carports, Patio Covers, and other Open Buildings - ALUMINUM POSTS Aluminum Post Wind Load = 1 02 MPH I 110 MPH I 120 MPH I 125 MPH I 140 MPH Applied Load = 17 #/Sq, Ft. I 20 #/Sq. Ft. I 23 #/Sq, Ft. I tl6 #/Sq. Ft. I 32 #/Sq. Ft. Maximum Allowable Roof Area in Square Feet for Various Loads on Post Heiaht Load in Lbs 2" x 2" x 0,044" Hollow Extrusion or 7'-4" 2,064 121 103 90 79 65 8'.7" 1,548 91 77 67 60 48 9'-10" 1,204 71 60 52 46 38 11'.1" 903 53 45 39 35 28 Height Load in Lbs 2" x 3" x 0.050" Hollow Extrusion or 8'.2" 2,736 161 137 119 105 86 9'-6" 2,502 147 125 109 96 78 10'-11" 1,596 94 80 69 61 50 12'-3" 1,197 70 60 52 46 37 Heiaht Load in Lbs 3" x 2" x 0.070" Hollow Extrusion - Aluminum Alloy 6063 T-6 8'-2" 3,408 200 170 I 148 I 131 107 9'-6" 2,556 150 128 I 111 I 98 80 10'.11" 1,988 117 99 76 62 12'.3" 1,491 88 75 I 65 I 57 47 Height Load in Lbs 3" x 3" x 0,040" Roll Formed - Aluminum Alloy 3105 H-14 10'-0" 2,381 140 119 104 92 74 11'-8" 1,786 105 89 78 69 56 13'-4" 1,389 82 69 60 53 43 15'-0" 1,042 61 52 45 40 33 Heiaht Load in Lbs 3" x 3" x 0.060" Roll Formed - Aluminum Alloy 3105 H-14 11'-0" 3,600 212 180 157 138 113 12'-10" 2,700 159 135 117 104 84 14'-8" 2,100 124 105 91 81 66 16'.6" 1,575 93 79 68 61 49 Heiaht Load in Lbs 3" x 3" x 0.060" Fluted Hollow Extrusion. Aluminum 6063 T.6 11'.10" 3,408 200 170 148 131 107 13'-10" 2,556 150 128 111 98 80 15'.10" 1,988 117 99 86 76 62 17'-10" 1,491 88 75 65 57 47 e Example: Find Roof Area Needed; Area = 'A'; Post Spacing ='S'; Structure Projection = 'W: A = S x (W/2 + O.H.); If'S' = 7', W = 12', and O.H. = 2' then: 'Area' = 56 Sq. Ft For a 10'.11" post and 120 m.p.h. wind load or 23 # I Sq. Ft post choices are: _ 1) 2" x 3" x 0.050" Hollow Extrusion 2) All post sizes listed below the 2" x 3" x 0.044" Hollow Section Note: Where job conditions dictate a post height of 10' in a 120 MPH wind zone, a 3" x 3" Roll Formed COULD NOT BE used because when it is more than 10' tall it can only support 39 SF of roof On the other hand, a 3" x 3" Fluted Post with a post height of 10'. 7" can support an afea of 128 square feet of area. Thus, design must satisfy both height and area requirements. Lawrence E. Bennett, P,E. CIVIL ENGINEER - DEVELOPMENT CONSUL TANT P.O. BOX 4368, SOUTH DAYTONA, FL 32121 TELEPHONE (904) 767-4774 FAX (904) 767.6556 e @ COPYRIGHT 1999 NOT TO BE REPRODUCED IN WHOLE OR IN PART WITHOUT THE WRITTEN PERMISSION OF LAWRENCE E BENNETT, PE