Is this acceptable install for engineered floor joists? 1 fastener in hanger to sill plate.
Yes, it looks like it from here…
http://www.strongtie.com/ftp/catalogs/C-2009/C-2009-p092.pdf
http://www.strongtie.com/ftp/catalogs/C-2009/C-2009-p090-p091.pdf
they are top mount hangers…they are common and approved.
there are four more nails on the top of each hanger.
…plus one on the other side.
Those are top hangers. It can’t be easily determined if they are installed correctly as the nailing is on the top. But with what you show I’d say they are unless I had some evidence to the contrary.
Common installation. You cannot confirm the 4 fasteners which should be in each of the two top flanges.