Tell him you analyzed the wood to be Eastern Yellow Pine, the hardest,
strongest and extinct (except for a few protected stands in Maine) wood
species ever used in construction. Then when you go to the span tables, use
Douglas Fir +1.2 ratio to find the equivalent strength.
EYP is what all the old brownstones and tenements in NYC were built of in
the 1800's. When old NYC buildings burn down, the brick crumble before the
timbers do usually leaving a burned heap of rubble with lots of semi-charred
timbers laying around.
That way, you'll be over designed and he won't know what to say...
I'm gutting my kitchen & dining room, combining them & building an office
for me in an 8' slice at the end with access to the outside. No structural
walls removed. Plans completed and stamped by me, Contractor signed, we go
to town BI. He pulls out his joist span chart and announces that I have to
sister all the second floor joists as they are 2X8 and therefore undersized
and install a beam at midspan under the 1st floor. It's a bedroom up there
and we sleep in it, I know I need to loose weight, but it hasn't broken yet
;-). The house was built in 1886 and has no structural problems for 120
years. I know it's not worth fighting about as ceilings will be opened, but
give me a break!!!