![]() ![]() In summary, collar ties and rafter ties perform different functions but are both essential roof-framing members. The 2006 IRC requires them to be at least 2-inch by 4-inch. It's not unusual to see rafter ties of either 2-inch by 4-inch or 2-inch by 6-inch. When rafters are installed on 24-inch centers, rafter ties are typically installed every other rafter. Where rafters are oriented perpendicular to the ceiling joists, rafter ties should be installed just above the ceiling joists. Lift the underlayment out of the way, and then lay a 3-ft.-wide roll of waterproof shingle underlayment in the valley. In most homes, the ceiling joists also serve as the rafter ties. The other option is to sister the rafters which I have plenty of details on. A lack of rafter ties is a serious structural issue in a conventionally framed roof. I want to beef up the roof and it looks like the best way is to add new 2 x 6 rafters to make the spacing 12 on center. Rafter ties are always required unless the roof has a structural (self-supporting) ridge, or is built using engineered trusses. They should be placed as low as possible in the roof framing. Rafter ties form the bottom chord of a simple triangular roof truss. A sagging ridge is one clue that the home may lack adequate rafter ties. When the walls spread, the ridge will sag. ![]() This helps keep walls from spreading due to the weight of the roof. Rafter Ties are designed to tie together the bottoms of opposing rafters. The 2006 International Residential Code (IRC) requires they have a minimum nominal dimension of 1-inch x 4-inch.Ĭollar ties, contrary to popular belief, do not prevent walls from spreading. Where they are required, they should be installed on every other rafter where rafters are on 24-inch centers. Inspectors should not call out lack of collar ties as a defect unless they know that collar ties were required in the jurisdiction in which the home is located at the time the home was built.Ĭollar ties are probably not needed if metal connectors were used to fasten the rafters to the ridge. They may or may not be required, depending on jurisdiction. Collar ties must be placed in the upper third of the roof. This helps brace the roof framing against uplift caused by wind. I cannot find any information pointing to the need for an interior load bearing wall with this design. ties are designed to tie together the tops of opposing rafters. The houses roof framing consists of collar and rafter ties with the rafter ties sitting directly on exterior walls and are also acting as the ceiling joists. FWIW Not sure how this affects BG999's project.Ĭollar ties and rafter ties are both horizontal roof-framing members, each with different purposes and requirements.Ĭollar Ties. Not the original poster, but Jim this is what I was taught. I would imagine it is the elevation of the timber but you should explain that to me. You're going to have to explain to me what the difference is between a collar tie and a rafter tie. ![]()
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