When an Inspector is conducting a NASHI or NAHI certified Home Inspection, they are bound to very specific terms that include ONLY VISIBLE DAMAGE. If you believe that there may be a structural problem with your property, I suggest that you bring in an engineer who can document the whole situation. Do this within your contingency period.
I like Barry Bornstein, Dan Pressman, and Apex Inspections for this type of inquiry.
For structural engineers I turn to Joe Graci/Franklin Engineering or CKS Structures.
Best of luck,
Hannah Angert, Realtor
(215) 869-9571 or firstname.lastname@example.org
William Festa Realty
3001 S. Sydenham St.
Philadelphia PA 19145
(215) 271-3000 phone
(215) 271-0988 fax