Roof Rafter Tie Down

A collar tie is a horizontal roof rafter compression connector that is located in the uppermost third of the span of a pair of opposed sloped or gable roof rafters.

Roof rafter tie down.

We can refer you to a home inspector near you to help you find out of your home can benefit from our mitigation and retrofitting services including hurricane roof clips and hurricane ties for roof trusses and to learn more about wind mitigation inspection cost. An updated inspection is required by your insurance carrier to qualify for additional savings on your insurance premium for your hurricane tie downs. Compare this with a similarly framed 12 12 roof that has similar loads. Tie down designs for tile and sheet roofs conforms to wind classifications of up to category n3 previously w41n designed to withstand a maximum gust wind speeds of 50 metres per second.

Truss and rafter tie downs are used for wood construction and wood framing projects. Simpson strong tie 1 1 2 in 12 gauge wood to wood triple zinc pipe rail tie. For pricing and availability. Simpson strong tie 5 2 7 in 18 gauge triple zinc steel rafter tie.

If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties. You can possibly remove them altogether of you include posts in the gable walls to support a structural ridge. 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. For 16 inch on center framing that means connecting four trusses at each end of the house.

Tie down details for repair of storm damaged roofs in south east queensland page 2 of 13. In finding this location we do not count the additional length of the rafter that supports the roof eaves overhang or soffit. Rafter ties or ceiling joists acting as rafter ties are required by code unless the house is designed so that the walls or a structural ridge beam carries the full load of the roof. A rafter tie forms the bottom chord of a simple triangular roof truss.

For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates. Rafter ties should be at least 2 x 4 inches nominal. By upper third here we mean one third of the length of the rafter from ridge to top plate. 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.

Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie.