This is probably an overly long explanation for a question for which I think I already know the answer to, (probably obvious) but other opinions would be great.
In tearing out some very old outdoor wooden steps that are starting to rot, a few of the center stringers for those steps split at the corners. Hence, the new treads (11 inches deep) at these locations will not be supported by that full 11 inches.
My plan is to sister a new board to the center stringer at those spots (the existing stringers, except for the several split corners, are still in pretty good shape). Both the stringers and sister boards are about 1.5 inches thick.
My question: I already have a good number of (expensive) 3.5 inch-long lag bolts that are plenty strong (1/4 or 3/8 inch). However, the end of the lag screw would stick out by a tiny bit (~ 1/4 inch max if I use a washer). I can't imagine this would be a problem (other than bothering me aesthetically, even though it will never be seen), especially since the end is tapered and not contributing to any holding strength, but just wanted to check.