Interior Girder: Undersized for the Span

[homebild]

According to the engineering tables, this section is undersized if used as an interior girder.

2 2x12s can only span a maximum distance of 7 feet when support 1 floor and the building width is 28 feet.

Not even 3 2x12s can span this distance. The maximum span for 3 2x12s is only 8′ 10″ for a builidng 28 feet wide.

You would need a minimum a 4 2x12s to span 10ft if this span is part of the middle beam and the width of the house is 28 feet.