I hired a framing crew to frame a new home in Anchorage, Alaska. When they were done I found that most of the nailing on the shear panels and seismic hardware was done incorrectly.
Many of the shear panels have nailing that is too narrow and too short. I verified with my designer and the nail manufacturer that the nails are wrong and do not have the shear strength of those specified in the plans.
Moreover, almost all of the Simpson seismic hardware on the outside of the building (twist straps and coil straps) was installed with nails that are also far too short. Simpson requires a minimum 2.5" nail when nailing through sheathing. My framers used a 1.5" nail.
In other places, the nailing on the sheathing, and the sheathing install generally, is just plain terrible:
I'm in a pretty serious seismic zone here. The 1964 earthquake was the second-largest ever recorded in history and killed over 100 people, and in 2018 we had a 7.1 just a a few miles north of the city. My home location is also exposed to a lot of wind.
How should I go about fixing the sheathing? The nailing is already extremely tight due to our seismic requirements--but the nails are all wrong. Could I pull the nails and replace them with slightly larger screws (something rated for the appropriate shear?) or do the panels need to be pulled and rebuilt?