Roof Rafter Tie Down

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.

Roof rafter tie down.

Truss and rafter tie downs are used for wood construction and wood framing projects. Tie down details for repair of storm damaged roofs in south east queensland page 2 of 13. 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 should be at least 2 x 4 inches nominal.

For 16 inch on center framing that means connecting four trusses at each end of the house. For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates. Compare this with a similarly framed 12 12 roof that has similar loads. A rafter tie forms the bottom chord of a simple triangular roof truss.

If you are framing a cathedral ceiling there are a couple ways to deal with the need for rafter ties. 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. An updated inspection is required by your insurance carrier to qualify for additional savings on your insurance premium for your hurricane tie downs. For gable end roofs the florida code requires that you start by tying down roof framing members within 6 feet of each corner.

Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie. In finding this location we do not count the additional length of the rafter that supports the roof eaves overhang or soffit. 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.

Simpson strong tie 1 1 2 in 12 gauge wood to wood triple zinc pipe rail tie. 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 category roof truss and rafter connectors ties and straps for cold formed steel construction. By upper third here we mean one third of the length of the rafter from ridge to top plate.

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.