Anyone familiar with this nailhead? Was thinking it might be something by Simpson but am not finding this head stamp on their site. It appears to be an IS or potentially a 1S
This is in the dome position of a joist to ledger connector.
those are galvanized nails, I dont think simpson marks their nails, but could be any brand. But by the color of the nail they are galvanized and the correct nails to use. At least they are not drywall screws.
Also I know they do stamp their heads. I’ve been browsing their technical documents for a bit looking for one that fits this description and haven’t found one yet.