If you have ever done a wood drag strut you know how valuable the double top plate is and specifying longer laps and more nailing.Īlso don't forget if you don't double plate then the wall height for pre-cut studs will be off. Code overlap is 24" with (2) 0.128x3" nail at 24" or "splice plate" (see below). Green building concepts be damned as they aren't think about the structure as a 3d concept rather only the vertical component. I am not a fan of the single plate either. Most wood design texts address this in detail. More critical in taller walls as sometimes metal angles are required with longer nailing especially at the roof as opposed to floor which will have a rim for purchase. Without the double plate, all joists/rafters/beams must have a stud underneath (+/- 1").Ĥ) out of plane wind load transfer from stud to floor. RE: Top Plate End Joints focuseng (Structural) 9 Jun 16 17:13ģ) Load transfer when vertical elements don't stack: 24" oc vs 16" oc or just the shoulder stud of an opening or a beam at floor opening. which should be designed to be supported by a very large roof or floor diaphragm. I would then question how a lateral load would get to this joint. Not very much.I guess it is good to have though. If the end post fails the single ply top plate will fail right after it.įrom an uplift stand point, the overlapping plate could be used to transfer the load across the corner however most engineers require uplift restraint each side of the corner or properly fasten the corner posts to get a force transfer along the entire height of the wall.įrom a lateral load stand point, assuming there are 2 nails in the overlap, there would be a 2-300 lb lateral capacity of this connection. What would this single ply 2x overlap provide?įrom a gravity load stand point, the end post of either wall would have to fail for the top plate to transfer any load to the adjacent wall. Drywall, exterior finishes, construction bracing, and non-load bearing framing. I personally believe any extra strength comes from the extra materials we don't account for. I suppose so, but requiring something that has no basis seems like it could get us in trouble.
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