![]() If you’re unsure of whether you can safely remove collar ties, consult your local code official or engineer. If rafters are sized correctly, this shouldn’t be needed, though it might explain why collar ties have been a part of roof structures for a long time. In this scenario, the load on one side is partially transferred to the rafters on the other side across the collar ties. Some engineers theorize that collar ties may minimize deflection of undersize rafters, particularly under heavy loads, such as snow. Theoretically, no-if rafters are correctly sized and properly joined by rafter ties, and if other means to resist uplift, such as ridge straps, are present. If you’re not sure if you need collar ties, you should consult an engineer. That’s the job of the rafter ties or the ceiling joists. ![]() The proper thing to do, of course, hinges on knowing why they’re there in the first place.Ĭontrary to popular belief, collar ties are not there to support rafters or to keep walls below from spreading under the weight of the roof. 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.īuilders have been installing collar ties for years, and for years, space-starved homeowners have been asking to have them removed, particularly if they plan to remodel their attic. Rafter ties resist the forces caused by gravity loads that would otherwise cause the roof to pancake and push out the sidewalls. Collar ties are necessary to prevent separation of the roof at the ridge due to wind uplift. In this “How It Works” article, managing editor Debra Judge Silber explains the role of collar and rafter ties in the framing of a roof. Synopsis: Collar ties may take up space in the attic of your home, but they are there for a reason.
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