Roof Rafter Tie

Rafter ties prevent spreading.

Roof rafter tie.

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

In most homes the ceiling joists also serve as the rafter ties. Illustration of roof with rafter tie. Located horizontally in the middle of the rafter s run or horizontal span neutral. High horizontal ties in the upper third of the roof under compression definition of mid span rafter ties.

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

Secure the opposite side in the same manner. Other facts about rafter ties. Definition of collar ties. Definition of low rafter ties.

Step 4 continue installing collar ties. A tension tie in the lower third of opposing gable rafters that is intended to resist the outward thrust of the rafter under load. With the first collar tie in place you will follow the same procedure. Compare this with a similarly framed 12 12 roof that has similar loads.

Located in the bottom. Collar ties prevent uplift. Truss and rafter tie downs are used for wood construction and wood framing projects. Nail one end of the tie into the rafter with 3 inch nails.

Figure 2 is an illustration of a roof constructed using rafter ties.