Roof Rafter Tie

Simpson strong tie category roof truss and rafter connectors ties and straps for cold formed steel construction.

Roof rafter tie.

Nail one end of the tie into the rafter with 3 inch nails. 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. Definition of low rafter ties. Definition of collar ties.

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. Collar ties prevent uplift. Figure 2 is an illustration of a roof constructed using 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.

Truss and rafter tie downs are used for wood construction and wood framing projects. Located in the bottom. Illustration of roof with rafter tie. In most homes the ceiling joists also serve as the rafter ties.

Contrary to popular belief collar ties are not there to support rafters or to keep walls. The tie will go from one side of a roof rafter to an adjacent rafter but on the opposite side. We detail these below. Measure for each new collar tie.

High horizontal ties in the upper third of the roof under compression definition of mid span rafter ties. Rafter ties prevent spreading. 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. A tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load.

Step 4 continue installing collar ties. Compare this with a similarly framed 12 12 roof that has similar loads. Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered. Where rafters are oriented perpendicular to the ceiling joists rafter ties should.

Secure the opposite side in the same manner.