A rafter tie is the lowest chord of a simple triangular roof truss. Roof ridges that droop are a telltale sign that the roof structure lacks rafter ties. The ridge board may droop when the walls expand. They assist in preventing structures from spreading due to the roof’s weight. Rafter ties resist the outward push that rafters apply to the outside walls. Rafter ties are between opposing rafters, and they should be as near to the top plate as possible. The top plate is the bottom of one rafter and the top of another. In many cases, ceiling joists are installed parallel to the rafters will be utilized as rafter ties.
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