Roof rafter tie rods3/20/2024 2 illustrates an example of exterior walls that bowed outward several inches following a record season of New England snowfall in 2014-2015, along with corresponding displacement and cracks to finishes on the interior and framing in the attic. 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 and have adequate connection capacity along their length to ensure continuity of the horizontal tie across the roof span, i.e.
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