I just completed an inspection on a house that had a three season porch attached to the rear side of the building (see attached pics). The issue I have is that the floor joists are 2x6 members spanning about 10’. The rim joists are also single 2x6 members which are supported by 4x4 posts resting on “cow pie” footings. Moreover, the 4x4 posts are not notched to support the joists but instead the joists are simply nailed into the 4x4s. Also, the floor joists are not attached to the ledger or rim with joist hangers but just nailed together. When you walk on the floor it you can instantly feel movement.
In my opinion the floor structure is not stable enough to support the structure above it, particularly with the weight of a shingled roof. The Realtor is not happy with my reporting as he states that this porch has stood for many years without incident. My concern however is that while it may be sufficient for one or two people, what happens if the owners have a dinner party with 15-20 adults standing on this porch? I feel that I reported this correctly. Any thoughts?