This algorithm puts the collar tie two feet below the ridge, but only if the ridge is 48" above the rafter ties. The collar tie length is a function of the pitch of the roof and the position of the collar tie. Note: some builder use a collar tie on every other rafter. Collar ties are suggested for roofs with a rise greater than forty eight inches (48"). Rafter ties or Ceiling Joists keep the rafter boards from kicking out under the downward load on the roof.
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