I brought a house that was built in the 70's. It has tongue and grove ceilings which are beautiful. But, since I have lived here for the last 3 years I notice a yellow dust continuously on my furniture and hard wood flooring. The ceiling appears to never have been sealed. I did paint our bedroom ceiling which also get this yellow dust on the furniture. Could the dust be coming from the ceiling? Are the boards expanding and contracting and releasing dust? If so what can I do about it?