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. <br /> Marriage line blocking cannot exceed 8ft without a 16x16 <br /> shocker set. Perimeter blocking must be installed within 2 <br /> ft of each end of the home as well as on either side of all <br /> windows over 4ft and all doors. Perimeter spacing cannot <br /> exceed 8ft. <br /> Main Rail: 4 — 6 ft = 16x16 footing <br /> Perimeter: 4 — 6 ft = 16x16 footing <br /> 6 — 8ft = 16x24 footing <br />