I purchased a Woodmizer last year and have been drying wood in anticipation of building our house. You'll want to get a copy of: "Grades, design Values and Span Tables for yellow poplar framing lumber", AG-351 from the North Carolina Ag Extension Service, Raleigh, NC, published 1985. If you go with poplar for the floor just remember that you'll get a lot of dents in it, maybe use it upstairs where there is less traffic. You can use your poplar for framing, floors, siding and many other purposes. If I were building a new home I'd use oak or antique heart pine for the timber frame. What you have to remember though is in the old days they didn't have log trucks and moving a massive beam was a large undertaking and so they usually used whatever trees were close at hand and were big enough to serve the purpose. I do some work with antique lumber and have seen many poplar beams used in old timber frame buildings. It may be best to use the yellow poplar for trim etc. Thanks for the info and I will check local codes and also the consulting architect with timber frame experience. Any other species are very difficult to get engineered. I know around here with our snow loads timbers are spec'd out for doug fir although some timber frames I've seen are heart pine. Check with local inspectors and engineers to see if they have specs for your codes/species. You need to contact your building inspector. Around here tulip poplar cannot be used for weight bearing walls in a dwelling.
It all depends upon your building codes as to whether you can use it, structurally sound or not. Is yellow poplar structurally sound/strong enough to consider for a timber frame? I hope to build a timber frame house within the next 1-2 years and have availability of yellow poplar around 24 inch dbh or larger and clear spans of 25-30 feet from the butt end.
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