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Roof rafter ties.
Moving the rafter ties up only 16 inches from the plate the maximum allowed by code increases the tie force from 1 440 pounds to 2 160 pounds.
Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie.
The tie force at the plate is 480 pounds and only 720 pounds when the ties are 4 feet up from the plate again the maximum allowed by code.
Secure the opposite side in the same manner.
Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered.
Rafter ties prevent spreading.
With the first collar tie in place you will follow the same procedure.
Collar ties prevent uplift.
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Measure for each new collar tie.
Contrary to popular belief collar ties are not there to support rafters or to keep walls.
Where rafters are oriented perpendicular to the ceiling joists rafter ties should.
Other facts about rafter ties.
Compare this with a similarly framed 12 12 roof that has similar loads.
Contrary to popular belief collar ties are not there to support rafters or to keep walls below from spreading under the weight of the roof.
In most homes the ceiling joists also serve as the rafter ties.
Nail one end of the tie into the rafter with 3 inch nails.
This means that if you secure one end of the collar tie to the left side of a roof rafter you will nail it to the right side of the adjacent rafter.
Simpson strong tie 5 2 7 in 18 gauge triple zinc steel rafter tie.