It turned out that the construction drawings had not been followed, and some load-bearing structures in the form of splice plates, studs, and beam hangers were missed. The whole framework has now been reinforced and supplemented; our engineer stated that the existing structure did not have the load capacity for any filler. It is so disappointing that the construction company does not take any responsibility for delivering at least a reasonably safe and good product, but only acts when they are proven to have done something "wrong."