Roof Rafter Ties

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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. 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. Simpson strong tie 5 2 7 in 18 gauge triple zinc steel rafter tie. Compare this with a similarly framed 12 12 roof that has similar loads.

Simpson strong tie category roof truss and rafter connectors ties and straps for cold formed steel construction. Nail one end of the tie into the rafter with 3 inch nails. Rafter ties prevent spreading. Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie.

In most homes the ceiling joists also serve as the rafter ties. 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. Where rafters are oriented perpendicular to the ceiling joists rafter ties should. Step 4 continue installing collar ties.

The tie will go from one side of a roof rafter to an adjacent rafter but on the opposite side. With the first collar tie in place you will follow the same procedure. Measure for each new collar tie. Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered.

Collar ties prevent uplift. Contrary to popular belief collar ties are not there to support rafters or to keep walls. 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.