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Learn more about roof framing, home remodeling and house repairs by watching more of our videos. In this video I will be sharing a building code I found that should help do it yourselfers who will be raising ceilings. Extra nails might be required when raising roof rafter ties when placing them between 1/10 and 1/3 of the lower over all heigh measurement under the roof ridge.
Here is one of the building code references.
TABLE 2308.7.3.1(1)HEEL JOINT CONNECTION ADJUSTMENT FACTORS