Is it a good idea to remove my lose fill in fiberglass insulation, it's super dirty, old and doing a lousy job?

I'm planning on putting in new fiberglass batt insulation with an R-38 value up in the attic, I was thinking about removing the old loose fill in trash bags, should I just keep it and put unfaced batt insulation on top of it? or just remove this lousy insulation and put in new faced R-38 ? What is the best thing to do. Like I said the old fill in fiberglass insulation has no vapor barrier, it's super dirty with what looks like shingle particles, but it's not because the roof has never leaked. What would you do in this case? See I'm afraid if I keep this old non-efficient loose insulation there and unfaced on top, it won't be as effective as just getting rid of it altogether. This loose fill in stuff is already compact and lost it's fluffiness and it's SPARSELY SCATTERED in some places. My heating and air conditioning is leaking through, since my heater takes so long to heat up the house and the house gets cold real fast and has to restart over and over. Thanks for your advicem especially if your a home improvement pro or roofing specialist. or if you've done this job yourself. I hear we can get a tax break for buying new insulation, about $1,200 if I'm not mistaken. I think this expires on Dec. 31st. Oh one other note, this loose fill in fiberglass insulation is who knows how old, but tests negative for asbestos. Thanks to the syrup response, I like the idea of using blown in cellulose , but I don't like the idea of burying my junction boxes and recessed lights and my electrical cables for that matter, with that blown in stuff. I'm placing those plastic soffet vent protectors at the edges, to prevent the insulation. I'm ok on you being opposed to using batt fiberglass, I just thought that stuff was more dependable and could still walk on the rafter beams, but I am willing to use blown in stuff, it's going to cover up the trusses that I walk on since I'm still running electrical cables for new lighting. It's a tough choice , blown in cellulose sounds easy and fast, but probably won't let me walk up there anymore, what's your experience, how many inches high should it be, this house is the mid atlantic climate, southern Maryland to be more exact. The back part of the house has an addition and it has faced batt insulation already. So you say no way to batt and favor blown in cellulose, ok Hey hyrup, what does moldy insulation look like, mine looks dark brown , black, and has particles that look like shingle particles, Maybe the original color looked yellow but now it looks like a tan orange. Are those symptoms of mold?

Asked By: mister? - 11/11/2010
Best Answer - Chosen by Asker
Neither. Get blow-in cellulose (stabilized if you're one who's heard the "horrible" rumors about cellulose settling). Even if you opt for "loose fill" cellulose (still better than any form of fibergalss, the installers will compensate for settling by blowing in extra (unless they're a shady company... More
Answered By: pancakes & hyrup - 11/11/2010
Additional Answers (1)
I prefer blown mineral wool (rock wool or fiberglass) for flat attic -- it does a better job of preventing air migration than batts, and it's easier to install -- Lowe's will loan you a blow machine if you buy from them. Right over existing is fine. As Syrup said, be sure the attic above the insulation is well... More
Answered By: Doug Boyd - 11/11/2010
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