Roof Rafter Tie Down

Simpson strong tie 5 2 7 in 18 gauge triple zinc steel rafter tie.

Roof rafter tie down.

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. Simpson strong tie 1 1 2 in 12 gauge wood to wood triple zinc pipe rail tie. 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.

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. When ceiling joists run perpendicular to the rafters inspectors may find rafter ties installed above ceiling joists as framing members every 4 feet running above the ceiling joists connecting opposing rafters. 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. 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.

If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties. Tie down details for repair of storm damaged roofs in south east queensland page 2 of 13. You can possibly remove them altogether of you include posts in the gable walls to support a structural ridge. By upper third here we mean one third of the length of the rafter from ridge to top plate.

Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie. 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. For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates. In finding this location we do not count the additional length of the rafter that supports the roof eaves overhang or soffit.

An updated inspection is required by your insurance carrier to qualify for additional savings on your insurance premium for your hurricane tie downs. A rafter tie forms the bottom chord of a simple triangular roof truss. 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. Truss and rafter tie downs are used for wood construction and wood framing projects.

Rafter ties should be at least 2 x 4 inches nominal.