![]() Deflection of the exterior walls from missing rafter ties can be extensive, costly to repair and even lead to collapse if the rafters completely detach from the exterior walls. In our experience, this is the most common cause of failures observed during loading from a one-time snowstorm or repeated seasonal snow loading events. When rafter ties are not present – often the case when ceiling joists are installed perpendicular to rafters – the exterior walls tend to bow outwards as the ridge deflects downward under vertical loading. The critical role of rafter ties in mitigating common residential roof issues
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