Question: When evaluating a wall, frame, or foundation for wind uplift, should the self-weight of the foundation be reduced when using the 0.9D + 1.0W LRFD combination or the 0.6D + 0.6W ASD combination?
Answer: Yes. If the self-weight of the foundation is relied upon to resist uplift, it is part of the stabilizing dead load and must be multiplied by the applicable dead-load factor: 0.9 for LRFD or 0.6 for ASD.
These load combinations account for uncertainty in both the wind uplift demand and the dead load relied upon to resist it. Accordingly, the full nominal weight of the foundation should not be used as resistance against the factored wind load.