||Thread Tools||Display Modes|
|11-07-2013, 09:41 PM||#1|
Join Date: Jul 2013
Location: Onalaska, Wisconsin
Posts: 25Rewards Points: 14
Attic Insulation Covered by Plastic
Looking for some guidance. We purchased a small vacation property in the last year. The home inspection revealed the prior owner had rolled out plastic on top of the insulation in the attic. In addition, the insulation was pushed tight to the side walls, preventing fresh air from coming up thru the soffets and out the roof vent.
Today, I added attic ventilation baffles, and removed the plastic.
While I was crawling around the attic, I noticed a significant amount of moisture between the top of the batting and the bottom of the plastic.
1 - why would someone put plastic on top of the insulation batting? It appears they added a new roof...would the prior owner have been trying to prevent slivers of wood from dropping onto the insulation batting?
2 - The insulation batting has a paper backing which is facing the ceiling drywall. Is it proper to have a paper backing on the batting?
3 - Some of the batting has "black" along the ceiling joists. I am "assuming" that moist air was working its way through the ceiling and up along the floor joists. In your opinion, do I need to remove any batting with black...or will the hot summer sun bake out the mold?
|11-08-2013, 10:33 PM||#2|
Join Date: Mar 2009
Posts: 11,595Rewards Points: 5,256
1. Ignorance. Housewrap (Tyvek 58 perms)will let the moisture from below through, not stop it as poly sheeting (0.04 perms), yet stop attic air convective looping from degrading your R-value. Remove poly/insulation, air-seal attic, replace insulation.
2. Yes, in a heating climate, attic application where attic air is very cold and insulation has space above it.
3. Probably dirt from the air-flow through it (think "furnace filter"), if mold, trash it; http://www.finehomebuilding.com/PDF/Free/021105092.pdf Wet fg losses 60-70% of R-value.
If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
Last edited by Gary in WA; 11-08-2013 at 10:36 PM.
|attic , insulation , moisture barrier|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Improving attic insulation: remove old fiberglass or just add cellulose/fiberglass?||DrSteveBrule||Insulation||12||10-22-2013 12:42 AM|
|Newbie questions on refinishing walkup attic with knee walls||FileOpen||Insulation||2||11-20-2011 12:31 AM|
|Damp Insulation in Attic||wiz561||Building & Construction||6||12-24-2010 12:16 AM|
|Adding insulation and storage to Cape Cod Side Attic||turin39789||General DIY Discussions||5||11-08-2010 11:50 AM|
|Attic insulation over the cavity above the stairs||jkocher||Building & Construction||5||10-15-2010 10:03 AM|