Within the past maybe 3 years or so we have been getting mold on your ceilingsIn some rooms more than othersIt is mainly along the molding and edge of the wall but sometimes it ventures into the middle of the ceilingSometimes it dripsWe dont know what is the cause of it and we're constantly wiping the ceilings downWe have been told it could be due to the insulation, so we took out the old and replaced it all and it still came backIf anybody knows why this could be happening as well as to get rid of it , for good, that would be extremely helpful!
First,make sure that the insulation over your ceiling does not contain a vapor barrierA vapor barrier will be a kraft paper, plastic or perhaps aluminumUnlike your walls your want to allow humidity in your house escape through the atticIf the insulation is okay then it is likely that your attic is not properly ventedIn most cases you want air be be able to enter the attic via vents or opening in the soffits located along its perimeterDon't fill them with insulation! This air then should exhaust through roof vents, ridge vent or perhaps gable end ventsThis flow will exhaust the moisture from the houseWithout this ventilation the warm moist air from within your house will condense on the underside of the roof during cool weather (most commonly the north facing slope) and then can drip down onto your ceilingOne final suggestion, if your house is built over a crawlspace check it out and make sure that you are not sitting over ponded waterThe moisture from this water will make its way through your house undetected as humidity and exacerbate any ventilation problem you might have in the attic.
Steel cuts with a much lower power laser than aluminumThin steel can be bent and it will hold its shape.
