Replies

1. 
   Paul_Taylor | May 05, 1999 03:46am | #7

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   Fred,
   Thanks. I'm doing a houser now which has ICF's for the daylight basement, SIP's for the above grade walls, and trusses at the ceiling/roof. I'm planning on cellulose for the above-ceiling space, but was kind of wondering about the relationship between volume and effectiveness. Do you think the 3.5 lbs. figure represents the best balance point?

2. 
   Guest_ | May 05, 1999 05:00am | #8

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   Paul,

   You can only acheive 3.5 lb per cu. ft. in an enclosed cavity, like a wall or a rafter bay with ceilings or ceiling joists with a floor above. Blown loose into an attic it will eventually settle out at a much lower density than that. Air sealing will have to be done independently of the cellulose in this case.

   Steve

3. 
   Guest_ | May 05, 1999 05:58am | #9

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   Any experience with this product, pros and cons, advise etc. We are considering it for use in the SF Bay Area on a new construction house that has cathedral ceilings (2 X 8) rafters, and 2 X 6 walls. What questions should I ask the insulation contractor in my meeting with him tomorrow, he is going to prepare a bid after the meeting? Thanks.

   Larry

1. 
   Guest_ | Apr 30, 1999 01:28am | #1

   *Larry,I have never heard of Greenstone Cocoon but cellulose is usually my first choice of insulation.Ask what density is being used in the walls (Should be at least 2.5 lb/cu. ft.) The attic should be installed by a certain number of pound per square foot NOT by the installed thickness. So the installer should specify how many bags or pounds he will be installing in the bid.Ron

1. 
   Guest_ | Apr 30, 1999 01:32am | #2

   *Ron,They are a Louisiana Pacific company, URL is http://www.greenstone.com. The product is a DP Cellulose sprayed in place wet. What product do you use and can you point me to a phone number or web site? Thanks.Larry

1. 
   Guest_ | Apr 30, 1999 10:38am | #3

   *Larry, I believe I used the same product, LP's Cocoon cellulose recently. From discussion here it doesn't seem the brand is a big deal, but the installation is. Dense pack is the way to go to avoid settling and improve air sealing. The diehards say 3.5 pounds per cube ft. Check the voulme to be filled and ensure that appropriate quantity is used.

1. 
   Guest_ | Apr 30, 1999 05:08pm | #4

   *Larry,I use whatever is available. As Andrew says, brand doesn't make much differance. A few companys do additional testing to prove the insect resistance but even those products are the same. The boric acid is the fire retardant used in all of them. I go with 2.5 lb./ cu. ft. with a vapor retarder and 3.5 without. Neither settle.Ron

2. 
   Guest_ | May 02, 1999 12:37am | #5

   *andrew d. forgive the nit picking. The 3.5 pounds per cubic foot installed density(side walls) comes form 20 years of measuring and observing installed dr cellulose in real world attics. When installed to 3.5 pcf it will not settle. GeneL.

3. 
   Paul_Taylor | May 02, 1999 04:29am | #6

   *Gene, So how do you know if your getting 3.5 lbs per foot? What methods have you used to install/verify this specific quantity?