Sawdust trail in crawl space below joints of OSB subfloor. No frass, no sign of insects. Thoughts?
It all points towards carpenter ants but if you see no evidence of insect then I can’t wait to hear from the experts here.
Was there a subfloor sheathing butt-joint above this area that may be moving/flexing against each other causing the dust?
Yes, T&G. Throughout the whole crawl space.
possibly sawdust swept from the floor above while in construction.
oh, nevermind