Foam vs Cellulose Blow in
Page 1 of 2 12 LastLast
Results 1 to 13 of 57

Hybrid View

  1. #1
    Join Date
    Mar 2008
    Posts
    205

    Foam vs Cellulose Blow in

    I do realize this isn't a insulation forum per se, but you guys I trust. WE have Phase I beginning next week of our project-insulation.

    We have 4 guys coming out to give quotes. Already have raw quotes over the phone.

    3 will blow in cellulose up to R-49 (on top of R-19) for $$ to $$$$

    1 apply foam to the underneath side of the roof for $$$$$$

    1650 ft2
    Ridge Vents
    Soffit vents

    Nothing outta the ordinary

    Your thoughts, IF THIS WAS YOURABODE, WHICH WOULD YOU PICK??????

    Sidebar: what about using both?

    Thanx once again!!!!

    RS

  2. #2
    Join Date
    Jun 2001
    Location
    DFW
    Posts
    684
    IF the duct work and / or air handler is in the attic, foam the underside of the roof and seal the ridge and soffit vents.

    Otherwise, take the existing insulation out, add 1" of foam to the top of the ceiling to air seal it, and add your R49 cellulose on top of that.

  3. #3
    Join Date
    Mar 2003
    Location
    PA/DE area
    Posts
    1,535
    i was in an attic today 95 degrees outside and spray foam on rafters of roof and attic was 72 degrees,it would have been hot as heck if it was fiberglass up there.It has to be better R vaule.
    It's NOT the BRAND,it's the company that installs it!!!!!

  4. #4
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889
    100% foam here in Southwest Florida.

  5. #5
    Join Date
    Jun 2001
    Location
    DFW
    Posts
    684
    Quote Originally Posted by adrianf View Post
    100% foam here in Southwest Florida.
    Where the dew point is often higher than the indoor temperature, foam is the best answer. In that case, spray foam is the only answer for existing construction. For new construction, polyiso foam in 4x8 sheets can be used at less than half the price of spray foam.

  6. #6
    Join Date
    Mar 2008
    Posts
    205

    Yeah the duct work is up there

    Quote Originally Posted by paul42 View Post
    IF the duct work and / or air handler is in the attic, foam the underside of the roof and seal the ridge and soffit vents.

    Otherwise, take the existing insulation out, add 1" of foam to the top of the ceiling to air seal it, and add your R49 cellulose on top of that.
    but the air handler is in a closet. I'm really thinkin' about goin' whole hog w/this and get the foam + cellulose blown in.

  7. #7
    Join Date
    Apr 2002
    Posts
    11,808
    Quote Originally Posted by RomulanSpy View Post
    but the air handler is in a closet. I'm really thinkin' about goin' whole hog w/this and get the foam + cellulose blown in.
    Doing both is a waste of moiney, after you get the quote for the foam you will not be thinking about spending any more money in the roof.

    To get the best answer, you need to state your approximate location.

    Foam in the walls has it advantages also. A stud wall with batts of fibreglass insulation is a filtered fresh air intake, air will flow through the wall and short circuit the insulation value, how ever the fibreglass will catch the big pieces of dirt.

    If you blow the foam into your wall you have stopped air movement

  8. #8
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889
    Quote Originally Posted by Carnak View Post
    Doing both is a waste of moiney, after you get the quote for the foam you will not be thinking about spending any more money in the roof.

    To get the best answer, you need to state your approximate location.

    Foam in the walls has it advantages also. A stud wall with batts of fibreglass insulation is a filtered fresh air intake, air will flow through the wall and short circuit the insulation value, how ever the fibreglass will catch the big pieces of dirt.

    If you blow the foam into your wall you have stopped air movement
    I believe he had something in the area of a $170.00 light bill that he is trying to reduce. Your thoughts please.

  9. #9
    Join Date
    Mar 2008
    Posts
    205

    Exactly

    Quote Originally Posted by adrianf View Post
    I believe he had something in the area of a $170.00 light bill that he is trying to reduce. Your thoughts please.
    Right now I doubt seriously if even have R-19 in the attic. TVA and other outfits say that I should max out at R-49 for Northern Mississippi.

    The quote on the foam is 3x as much as the blow in, but still wondering if bringing cellulose up to say R-30 and 5" of foam would be better or overkill.

  10. #10
    Join Date
    Apr 2002
    Posts
    11,808
    Quote Originally Posted by adrianf View Post
    I believe he had something in the area of a $170.00 light bill that he is trying to reduce. Your thoughts please.
    the romulon guy or the super insulated guy?

  11. #11
    Join Date
    Jul 2008
    Location
    Rydal,Ga
    Posts
    84

    Rumo check out my page....

    Rumo.

    All foam anywhere... We do foam and cellulose and HVAC

    "Build it Tight Size it Right"

    There is no better $$$ spent than the roof !!!

    Go to my web page...... pick it up from my profile
    Attached Images Attached Images  

  12. #12
    Join Date
    Jun 2008
    Posts
    63
    I do love the concept, if not the price, of a sealed attic. Cool, clean, bug and bat resistant, easy to see plumbing, wiring, etc.

    But how would you find a small roof leak prior to it becoming a major problem?

    What are the considerations for a gas furnace in a sealed attic?

  13. #13
    Join Date
    Mar 2008
    Posts
    205

    Man that's nice

    Quote Originally Posted by kenny mac View Post
    Rumo.

    All foam anywhere... We do foam and cellulose and HVAC

    "Build it Tight Size it Right"

    There is no better $$$ spent than the roof !!!

    Go to my web page...... pick it up from my profile
    do you have any insulation below?

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event