hi, i am planning to gut renovate a 1930s house in ny. one of the (plaster) walls had an issue so we opened it up to take a look. in the process, we exposed some floor joists. i think they are 2x8, but what was strange was that a few looked bent. has anyone else seen this? pictures are attached...
They are just warped. Most likely they warped in the first few years after the house was built...the first year even...as they dried out. Structurally they are fine. The only issue you may encounter, if any of them are warped enough, are some issues in drywalling the ceiling. Nothing that a little planing or furring would not address.
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Yes, I have...not floor joists...but ceiling joists and rafters. High humidity and heat as best as I can figure. Your floor joists look just like some of my 1954 ceiling joists (2x12's...11.25" measured) and rafters (2x6's) over my master bathroom. I think mine was caused by heat and moisture.
But, could have been caused by drying process after they were installed as was said by Iron Light