do i need a vapor barrier in ceilings with blown-in insulation? | |
i have cellulose blown-in insulation in the ceilings of my home but there is no vapor barrier, nothing, just cellulose blown in over ceiling drywall and wood rafters. i want to add more insulation - do i need to remove existing insulation & add a vapor barrier (what type) before putting old & new insulation back in? or, can i just blow in some more insulation and not expect to have any problems? about a 10 year old house and really haven't had any issues that i know of. thanks
Answers:
From: wogga
while i'm just a handy person, not a contractor, i have been researching this issue and thought i'd comment...
any time you have a warm space next to a cold space, there will be condensation resulting. a vapor barrier is usually therefore placed on the 'person' or warm side of the insulation. if you have a difference in temperatures and you have insulation but no typical plastic sheeting barrier, then you could will have moisture probably. however, if your insulation itself somehow stops the moisture (backed fiberglass batts, some blown in foams) you are okay. if you've got cellulose, that doesn't have a vapor barrier. you could still be okay if someone has painted the interior of your house (the inside of the exterior walls) with a vapor barrier paint. you can buy vapor barrier paints from paint stores. i believe these consist of vinyl.
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