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CONSTRAINED REQUIRED SLAB AREA PER POST <br />FOOTING SIZE (SQUARE FEET) <br />d (IN)CONCRETE SLAB THICKNESS «N) <br />3.5 5.5"7.25"9.25" <br />20 26 17 13 10 <br />21 31 20 15 12 <br />22 36 23 17 14 <br />23 41 26 20 16 <br />24 47 30 23 18 <br />25 54 34 26 20 <br />26 61 39 30 23 <br />27 70 44 34 26 <br />28 78 50 38 30 <br />29 88 56 42 33 <br />30 98 63 48 37 <br />31 110 70 53 41 <br />32 122 78 59 46 <br />33 135 86 65 51 <br />34 149 95 72 56 <br />35 164 104 79 62 <br />36 180 115 87 68 <br />37 198 126 95 75 <br />38 216 137 104 82 <br />39 236 150 114 89 <br />40 257 163 124 97 <br />41 279 178 135 106 <br />42 303 193 146 114 <br />43 328 208 158 124 <br />44 354 225 171 134 <br />45 382 243 185 145 <br />46 412 262 199 156 <br />47 443 282 214 168 <br />48 476 303 230 180 <br />49 511 325 247 193 <br />50 547 348 264 207 <br />BUILDING PRODUCTS <br />2440 Albright <br />Houston, TX 77017 <br />Fti14*1411 m <br />Carl Putnam, P. E. <br />1*11044-1 Ivylin.A rlage <br />Lynchburg, VA 24503 M8-2005