if it falls under the door you should install one on each side of the door.
realistically anchor bolts only secure the sill plate to the foundation. unless you have a designed connection between the wall/floor/sill plate they do not keep the house on the foundation. this is the reason that in some parts of the country (high wind and seismic) it is common to see large holdown brackets being installed to stud corners (or even posts) down into the foundation, and this type of connection going up the corners to the upper most top plate and connections being made of either side of wall openings such as windows and doors.
Pawl.... What Gary says is important, not just the application of hold-downs, but overall in trying to bring the old Socal properties nearer to code and better prepared for earthquake occurance.
I just added on 1800' two story addition in Dana Point on a 1949 beach shack. First experience in Cali and earthquake engineering.
Not that your idea to secure the chit out of that mud sill is not noble, but old construction has so many weak links in the earth quake chain, it seems to me to be overkill on one weak link, especially when Simpson plates are probably sufficient and the difficulty of trying to replace anchor bolts with epoxy that isn't going to add very much hold down anyway.
Weak links abound, adequecy of the foundatione depth- size- concrete competancy, 3x4 mudsills that don't split ,4X 1/4 anchor washers. shear walls, hold-downs and their hold down pads, X bracing, shear strapping, second floor hold down strapping, blocking, 4x6 corner studding etc etc.
Not to be a defeatest, but your energy might be put to more efficient/ economical use to have a eng with remidial design experience for earthquakes to inspect and recommend which weak links are best and most feasable to attack.
Just an idea... it seems alfully tough to drill those anchor bolt holes with a non-hammer right angle unless your concrete is allfully soft... in which case there is probably not much hold down to gain.
Never stop learning (xcep fer speling en typeing)
Last edited by MTN REMODEL LLC; 06-04-2013 at 04:05 PM.