Alex, that is where a routine comes into play…e.g. start on the outside going clockwise. and do the same on the inside or however works for you.
Point being, don’t let anyone make you vary from your routine…it made me miss things.
You and only you are in charge at your inspections.
I’d look up your state’s edition of the IRC, Section 4. It will have all of the tables you’d want to get to know.
Then you’ll also want to know the IRC’s girder span provisions.
Plus HUD has a bunch of good references. And Carson Dunlop:
So in that first year, I’m sure there will be a few times where I will realize a week or two after I submit a report that I missed something. What do I do in that situation? Do I contact the client and tell them oh sorry you bought the house but I just realized you had one more defect? Or should I stay quiet unless it’s a major defect or safety hazard? This question has been nagging at me lately.
Thanks Darren! I see you’re a PE. I passed the exam but never became one. What made you switch to home inspection? Just curious.
You don’t actually measure spans in a crawlspace do you? I would think that would be technically exhaustive. Do you practice engineering still? I could technically do the paperwork to get my PE just to have that credential but I feel it might be too much work to keep up two licenses and I don’t want clients to think I’m giving them a structural evaluation. Structural is not my strong suit.
I would say something if it was a safety hazard.
I have had situations where I missed something and after a day of two realized it. So, I send an addendum and reminded them of speaking about it at the inspection and said to make that part of their report now. 
But, that was before the closed and before their inspection contingency was up.
If it is after they close, you and your insurance may have to open your wallets depending on the client. 
Without additional info and images I can’t see how anyone can make a determination.
I got into it about 10 years ago. But I never really switched. I do mostly commercial inspections.
No, no measurements, except some commercial clients demand it in their reports. And I do practice engineering on a regular basis. If I were you, I’d get the PE. And with your civil degree and specialty (soils, iirc), you could be doing Phase 1’s pretty easily.
Thanks for the advice - Phase I’s may be fun. I’ll consider that for the future after I develop the home inspection side. 
let the buyer know the support is non standard construction practice and to further evaluate repair by a qualified contractor