A friend used trim head screws for ALL of the 2x4 framing (including the outer walls) of his 2400 sq. ft. house. The house uses 8x8s to carry the load, so I suppose that none of the 2x4 framing is load bearing; and the inspector did not see a problem with it (but maybe she didn't even see them). Is it built to code? Would it be correct to assume that (at least) the outer walls are in danger of windy conditions and earthquakes?

A friend used trim head screws for ALL of the 2x4 framing (including the outer walls) of his 2400 sq. ft. house. The house uses 8x8s to carry the load; none of the 2x4 framing is load bearing. The inspector did not see a problem with it (but maybe she didn't even see the screws).

Edit- the picture below shows a similar (post and beam) style of building. The original building was a wood/furniture shop (not commercial); it was erected about 20 years ago (±5 years). The old exterior walls were removed (I don't know anything about them); the new walls are 2x4 construction with trim head screws, including the exterior walls. The friend is a maintenance guy... not an engineer.

Is it built to code? Would it be correct to assume that (at least) the outer walls are in danger of windy conditions and earthquakes?