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Ceiling and interior wall leak

I have an 8 yr old home - two story . I recently noticed water stains in the bedroom and interior wall. I checked attic thoroughly and did not find any moisture at all and it hasn't rained but once in the past two months. Insulation in attic is probably 10-12 inches, but I could not find any soiled insulation anywhere. Could this be something else? Condensation from bathroom fan? What can I check? I am wanting to paint the bedroom, but want this issue addressed first. Thanks!

Re: Ceiling and interior wall leak

Check and see if you have a cold spot in that area. Air infiltration do to a lack of insulation or and opening to the out side can cause cold spots that will condense the moisture in the air.

Re: Ceiling and interior wall leak

That might explain the ceiling, but not the middle of the interior wall. Attic is well insulated, a good six inches above the ceiling joists. I will have to dig into the insulation just to see the ceiling drywall moisture. I'll check side of the house as well, maybe birds have created a gap allowing cold air to enter. Thanks!

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