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JoeK
02-11-2006 16:07:05
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Re: Blow-In Fiberglass Insulation in reply to Ron in Nebr, 02-08-2006 21:35:08
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"Insulation"is primarily provided,not by the insulating material,but by the amount of air trapped within it.Moisture tends to condense at the "dew point"within the insulation where the warm moist air meets the cooler airsettling thru the material.This is why you want airflow over the insulation,to carry any moisture out before it becomes a problem or"pools up" in the media and compacts it,or drips back down through the ceiling.The use/contents of the building make a huge difference.For instance livestock,drying hay etc give off vast amounts of water vapor,where storage of dry goods,machinery result in little vapor.A bulding with a vented heating system(chimney/pipe etc)or electric heat will contain far less vapor than one using unvented space heaters.A "tight" building with floor,tight doors etc will also reduce moisture as damp air is not continually seeping in.The plastic covered insulation you mentioned uses the plastic as a vapor barrier,keeping it from penetrating into the insulation media and allowing it to evaporate back into the room air.The "tin" ceiling you have,unless caulked at each joint and fastener is not a vapor barrier although sealing what you have up,would be less work than tearing it all out.The whole princpal is to keep any water vapor from entering the insulation and the venting is to carry off any moisture that does get thru.As to time frame on damage...impossible to determine..depends on many factors..amount of vapor generated,amount leaking into insulation,temperature variations in weather,ventilation of area both above and below insulation etc,etc. The "baffles" are very lightweight foam generally,could probably be put up with construction adhesive if need be.
Didn't mean to terrorize you on this matter,just that theres potential for some real problems to develop with factors as they are that needed addressing.
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