In some cases just leave it alone
Q. We've had cellulose insulation pumped between the floor joists in our attic. Since then people have variously been telling us: (1) We need a vapor barrier; (2) we should use glossy paint on the bedroom ceiling which is papered; and (3) we don't have to do anything. What do you say? Stephen J. Beecroft Winona, OntarioSkip to next paragraph
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A. If it were my house I'd leave it exactly the way it is.
An added barrier, such as an oil-based enamel paint on the bedroom ceiling, would thwart a certain amount of humidity, but the effect is likely to be minuscule.
After all, the fact that you already have many coats of paint, plus wallpaper , now on the ceiling, there is little in the way of vapor transmission into the attic.
My advice: Don't worry about it.