Shed Roof Rafter Ties

The rafter ties were clearly pulling away from their rafters because of the tension forces they were experiencing when under snow load.

Shed roof rafter ties.

For an 8 10 shed one sheet of plywood should be fine. Rafter ties are always required unless the roof has a structural self supporting ridge or is built using engineered. I noticed that steel cables has been hidden behind the rafter ties to try to reinforce them but the screws attaching the cables to the rafters were also pulling out. A collar tie is a length of lumber that attaches to each opposing rafter near the peak preventing your rafters from spreading apart.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. A rafter tie resists spreading of the building walls by bulges at the wall top that would otherwise occur due to roof loads. A rafter tie is a horizontal tension tie that is located in the lowermost third of the span of a pair of opposed sloped or gable roof rafters. Simpson strong tie 6 in 18 gauge triple zinc steel rafter tie.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Collar ties are necessary to prevent separation of the roof at the ridge due to wind uplift. For pricing and availability. The rule of thumb is that the gusset should be twice the width of the wood you use for your rafters.

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. Many local counties across the country now require the use of hurricane ties for roof framing on homes and your shed is no different. For additional support you can use ceiling joists which are lengths of lumber that run from the end of one rafter to another. For pricing and availability.

This also was a sign of tremendous tension. If heavy winds can damage a roof by uplifting the trusses on a house think what it can do to a shed. You are going to cut out triangles that will cover the apex of each set of rafters. So roughly 7 8 long for a 2 4.

In most homes the ceiling joists also serve as the rafter ties. Where rafters are oriented perpendicular to the ceiling joists rafter ties should. Rafter ties resist the forces caused by gravity loads that would otherwise cause the roof to pancake and push out the sidewalls. If your garage is 24 feet wide and has a 4 12 roof the new rafter ties can be placed no more than 16 inches up from the plate without additional engineering.

Other facts about rafter ties.