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  1. #27
    Join Date
    Jul 2008
    Location
    Melbourne FL
    Posts
    10
    Quote Originally Posted by energy_rater_La View Post
    here we go again...rb paint vs rolls of rb attachec to roof decking...
    No, this is something that can be used in ADDITION to rolls of insulation. I never said that they were better, just s suggestion. Especially for houses with exposed Tongue and Groove ceilings, such as mine.

  2. #28
    Join Date
    Jun 2004
    Posts
    31
    Has anyone else thought about using spray foam insulation on ductwork? I wrapped the metal duct at my dads house with 2 1/4" fsk and then two wraps of reflectix with an airspace between them and it has helped quite a bit as he has no shade whatsoever.

  3. #29
    Join Date
    Jul 2008
    Location
    Rydal,Ga
    Posts
    84

    Yeap !!! We do it every day... Little ugly...Works Great

    Quote Originally Posted by buddylee View Post
    Has anyone else thought about using spray foam insulation on ductwork? I wrapped the metal duct at my dads house with 2 1/4" fsk and then two wraps of reflectix with an airspace between them and it has helped quite a bit as he has no shade whatsoever.
    The foam is ugly... it is awesome !!!
    Attached Images Attached Images  

  4. #30
    Join Date
    Jul 2008
    Location
    Melbourne FL
    Posts
    10
    Quote Originally Posted by kenny mac View Post
    The foam is ugly... it is awesome !!!
    Does this meet the NFPA Standards for flameability???? If it does, than it looks much easier than wrapping it.

  5. #31
    Join Date
    Jul 2008
    Location
    Rydal,Ga
    Posts
    84

    Our stuff is astm e84... and corner burn

    Quote Originally Posted by triforcharity View Post
    Does this meet the NFPA Standards for flameability???? If it does, than it looks much easier than wrapping it.
    THIS IS PASTED FROM THE IRC 07 SUPPLIMENTS


    M1601.3 Duct insulation materials. Duct insulation materials shall conform to the following requirements:
    1. Duct coverings and linings, including adhesives where used, shall have a flame spread index not higher
    than 25, and a smoke-developed index not over 50 when tested in accordance with ASTM E 84 or UL 723,
    using the specimen preparation and mounting procedures of ASTM E 2231.
    Exception: Spray polyurethane foam shall be permitted to be spray applied to the exterior of ducts in attics
    and crawl spaces subject to all of the following:
    1. The flame spread index is not greater than 25 and the smoke-developed index is not greater than
    450 at the specified installed thickness.
    2. The foam plastic is protected in accordance with the ignition barrier requirements of Sections
    R314.5.3 and R314.5.4.
    3. The foam plastic complies with the requirements of Section R314.

  6. #32
    Join Date
    Jun 2004
    Posts
    31
    Originally Posted by kenny mac
    The foam is ugly... it is awesome !!!
    Whats the R-value and what kind of time savings do you get from it.

  7. #33
    Join Date
    Jul 2008
    Location
    Rydal,Ga
    Posts
    84

    Buddy there is a bunch of depends....

    Quote Originally Posted by buddylee View Post
    Whats the R-value and what kind of time savings do you get from it.
    Closed cell foam is 7 Rs per inch.... and you can't pay me to put a system in an unconditioned attic... if I can help it...

    So one of the major steps omitted is sealing all the joints and connections....
    You can be a bit more liberal on your take off placement...
    No wrapping taping or stapling...
    The boots are a breeze....

    So yea... it saves a bunch of time....

    It seems to cost a bit more at the end of the day...

    Thanks

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