Roof Rafter Tie

Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered.

Roof rafter tie.

Truss and rafter tie downs are used for wood construction and wood framing projects. Other facts about rafter ties. Measure for each new collar tie. Secure the opposite side in the same manner.

Located horizontally in the middle of the rafter s run or horizontal span neutral. Nail one end of the tie into the rafter with 3 inch nails. High horizontal ties in the upper third of the roof under compression definition of mid span rafter ties. 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.

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. Figure 2 is an illustration of a roof constructed using rafter ties. Simpson strong tie category roof truss and rafter connectors ties and straps for cold formed steel construction. Where rafters are oriented perpendicular to the ceiling joists rafter ties should.

A tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load. Located in the bottom. Collar ties prevent uplift. 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.

The tie will go from one side of a roof rafter to an adjacent rafter but on the opposite side. We detail these below. Step 4 continue installing collar ties. With the first collar tie in place you will follow the same procedure.

Contrary to popular belief collar ties are not there to support rafters or to keep walls. Rafter ties prevent spreading. Definition of collar ties. Compare this with a similarly framed 12 12 roof that has similar loads.

In most homes the ceiling joists also serve as the rafter ties.