![]() Frankly, you have no idea what you're talking about, and spreading this structural nonsense is not helpful. Since a roof beam does not generate any lateral forces (like a ridge board does), there is no reason for a collar tie. ![]() ![]() This is why you will always have a ridge BEAM with heavy roofs. Increase the loads with a tile roof, and you are looking at FAR more nailing required. Unlikely you could do this in a way that would not split the wood. Here is a sample structural calculation by a structural engineer that shows what even a lightly loaded tension forces are for a ridge BOARD arrangement: At the ceiling in the above example, you would be looking at at least 14-16d nails at each rafter/ceiling joist connection. Straps across the ridge are only needed for wind uplift forces that tend to pull the rafters away from the ridges. Generally, rafters are designed as beams to handle the full live and dead loads of the roofing material, and do not need any additional reinforcement. A rafter tie, especially as you get to lower slopes, is not going to work because the tension forces will require far more nailing/bolting than a rafter or ceiling joist can handle. With a high dead load, you most specifically are going to be using a ridge BEAM (as opposed to a ridge board). and I would defy ANYONE to show me a roof designed for clay roof tiles that is specified just using metal straps. If you have a high dead load roof then you will be using collar ties.
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