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Old 01-30-2009, 05:52 PM   #16
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Insulation - Cellulose vs. Icynene


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Originally Posted by Chemist1961 View Post
Before you take the plunge and to learn more about ventilation for the attic suggest you review this site buildingscience.com
Is this what you had in mind? http://www.buildingscience.com/docum...n/?full_view=1

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Old 01-30-2009, 06:05 PM   #17
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Insulation - Cellulose vs. Icynene


There is a big debate on whether the attic needs ventilation. Although batts are easy to move and work around, it seems they are not as efficient as the icynene or cellulose. I'm not sure which way to go, and although I am investigating and trying to get informed - the more confusing this is all getting
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Old 01-30-2009, 10:40 PM   #18
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Insulation - Cellulose vs. Icynene


Meth, i would be very scared about having an unvented attic in your climate. These may work in a dry climate like Arizona. Also you have an older home that likely has many warm air leaks into the attic, the moisture the warm air carries needs to be disposed of by some mechanism, other wise it will eventually find its way through the semipermeable foam and condense on the roof decking. This will wet the foam and accelerate the rate of condensation. I would use the blown in and do what you can to seal all air leaks into the walls and ceiling. There are a large number of ways to do this sealing. time consuming but well worth the effort.
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Old 01-31-2009, 07:55 AM   #19
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Insulation - Cellulose vs. Icynene


Thank you for the feedback and advice. Your concerns about moisture and ventilation validate my own concerns. I am starting to get more and more nervous about the Icynene. I'm thinking about using blown in cellulose around the majority of the attic, then using batts around the 2 air handlers in case I need to work on them the batts will be easier to move around. I can then wrap the handlers with an insulated wrap blanket. The big problem is addressing all of the current warm air leaks, I guess I need to pull each batt up (that's currently there) and look for potential leaks and then spray foam to seal them. Big pain but I'm sure its worth it. I will hire someone for the cellulose so maybe they will do this service for me as well. I'm sure it will still be a third of the 7k icynene cost. I would really like the basement sill plate sprayed with icynene though and this guy won't come out for such a small job. Its a 300 dollar line item on the initial quote, to just do the sill plate he wants 1000 as his minimum fee
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Old 02-01-2009, 08:57 PM   #20
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Insulation - Cellulose vs. Icynene


I agree with what's been posted by the others. In your situation (which is basically the same as mine), I would go with the cellulose. If I were building new and had the cash, I'd go with icynene. I've seen it done as the contractor suggested and it works very well and seals the house up well, but IMO it's something to be done on new construction as part of the design of the home. Adding it after the fact... nah, I wouldn't personally do that.

We just built an addition and I have the same attic situation... going with blown in for both. Good price and effective, plus the house was designed for it.. ridge vents and sofit vents.

Good luck!
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Old 02-02-2009, 08:36 AM   #21
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Insulation - Cellulose vs. Icynene


Thanks - I am working on a cellulose bid right now - My guess is that it will come in at about 1/3 of the Icynene bid. I spoke to the icynene contractor again about coming out to do the sill plate in the basement as I really think that makes sense to do - he will not schedule an appointment for such a small job but instead says that I can be on a "will call" basis and when they have another job in the area they can swing by and do mine. This pisses me off - I understand its a small job, but its still a job and it may lead to more work in the future, I explained I am getting ready to finish the basement and I would like to spray the foundation walls after its framed. Oh well - I will find someone else, and I will keep everyone posted on the cellulose situation
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Old 04-28-2009, 01:55 PM   #22
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Insulation - Cellulose vs. Icynene


meth, how did things turn out?
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Old 04-28-2009, 02:13 PM   #23
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Insulation - Cellulose vs. Icynene


Actually I just had the job done this past weekend. I had cellulose blown in the attic, as well as the ceiling in the garage since my bedroom is above it. Had the whole job done for about 20 percent of the foam cost. Couldn't get the icynene guy to do the sill plate, he wanted 1300 minimum job cost and. I had to wait until "he was in the area". I am glad I saved the money and went with cellulose.
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Old 04-29-2009, 07:42 AM   #24
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Insulation - Cellulose vs. Icynene


What depth of cellulose was installed ?

How was the garage done?

I also have living space above the garage. The garage ceiling has batts in it but there is still a good bit of open space between the garage ceiling drywall and the batts. I have been wondering if filling the rest of the cavity with cellulose will appreciably improve the comfort in the room above.

Since the sprayfoam is so expensive relative to cellulose, I have also been considering limiting sprayfoam use to the top plate of the attic and the sill plate in the basement and using cellulose elsewhere. Or perhaps a hybrid application of 3.5 inches of foam between the attic floor joists as an R-13 air barrier and then R-19 unfaced fiberglass batts on top of that for ignition barrier and the balance of the R-30 required for Climate Zone 3.

I would rather have the energy efficiency of the unvented attic design, but conversion of a vented attic to unvented so much more costly than improving the insulation of the vented attic.
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Old 04-29-2009, 09:12 AM   #25
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Insulation - Cellulose vs. Icynene


Not sure of the depth of the cellulose - have to go up and look at the measure marker he has there - My goal was to add an additional R30 value but that may be a bit aggressive.

As for the garage ceiling - they cut a small hall - insert the cellulose hose and fill the cavity - I am sure it is going to make a big difference to the living space above. The best part is I did not have to take down all the sheetrock and reinstall, as I would have had to do with the icynene

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