Thermal bridging via a steel I-beam in an exterior wall
We have a masonry row house building with interior insulation (about R16) in New York city. The exterior of the building consists of 3 wythes of brick (about 12″ thick). We are now building a steel frame deck. 2 steel i-beams will be inserted into the outermost wythe to support the deck. Does this present any kind of thermal bridging?
Note, the i-beam does not penetration the two innermost layers of brick npenetor the interior insulation. It only penetrates 4 ” or one brick width in.
I ask this question because I don’t really understand if the cold steel up against the brick actually presents more of thermal threat than the ambient air temperature.