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  1. #14
    Join Date
    Dec 2003
    Posts
    2,410
    Gotcha. And I was just messing with you too.

    It is code here and really good practice also. If the duct is in the conditioned space, not a big deal, agreed. If its in the attic or crawl space, it should be sealed. And its almost all in "non-conditioned" space here.

  2. #15
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,187
    I pay less than $25 a roll for hardcast brand 1402 mastic tape.
    and that includes tax.
    materials are charged to homeowner, so what is the worry that
    it is a higher cost than paint on mastic. the money saved in time
    not used waiting for mastic to dry makes up the difference several times over.

    just my pov.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  3. #16
    Join Date
    Nov 2012
    Location
    Worcester, MA
    Posts
    16
    Quote Originally Posted by energy_rater_La View Post
    I pay less than $25 a roll for hardcast brand 1402 mastic tape.
    and that includes tax.
    materials are charged to homeowner, so what is the worry that
    it is a higher cost than paint on mastic. the money saved in time
    not used waiting for mastic to dry makes up the difference several times over.

    just my pov.
    I dont even wait for it to try just wrap it right after with bubble wrap, can be messy sometimes. And i only ask not because of pride but because its also code in relation to duct leak testing

  4. #17
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,187
    I never use bubble wrap. code allows it in Ma?
    not here. and our codes allow R-6.
    you might find this article of interest.
    http://www.energyvanguard.com/blog-b...diant-Barriers

    I only use R-8 ductwrap for hard pipe, and
    have to special order it, as supply houses stock
    R-6. putting R-6 in a hot vented attic makes no sense
    at all. but code allows it. crazy!
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  5. #18
    Join Date
    Jun 2011
    Location
    Houston area
    Posts
    1,493
    I read the article. There are things about his description of radiant barriers that defy physics. And maybe, due to his choice of words, it's semantics.

    If a fluid or solid of any sort exists in any state it will seek equilibrium, either positive or negative, Doesn't matter if the energy mechanism is conductance, radiance, convection or any other thing in the Milky Way. The mathematics are pretty straightforward and do not lie. The conservation of energy and mass are irrefutable.
    The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

    `. .` .>(((>

    `... `. .` .>(((>

    .` .>(((>

    LMAOSHMSFOAIDMT

  6. #19
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by energy_rater_La View Post
    I pay less than $25 a roll for hardcast brand 1402 mastic tape.
    and that includes tax.
    Stop buying the cheap stuff, get Hardcast 1403, with the black butyl rubber!

    It is easier to work with than 1402, especially in hot environments. The reduced hassle, is worth the price.
    If more government is the answer, then it's a really stupid question.

  7. #20
    Join Date
    Oct 2011
    Location
    Indiana
    Posts
    33
    Around here we are still getting used to increased RNC energy codes that include duct sealing. You're only allowed so much duct leakage and it includes what is lost at the boot going into the conditioned space.
    The three most prevalent methods I've heard around hear are Mastic, the Hardcast tape w/ blue writing and black rubber backing, and siliconing every joint. Everyone has their own preference, but it seems the tape is the most popular in my county.

  8. #21
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by Cooked View Post
    I read the article. There are things about his description of radiant barriers that defy physics. And maybe, due to his choice of words, it's semantics.
    What are your specific issues with what he said?

    I ask, because everything he said about radiant barriers, and about how the bubble wrap stuff would have to be installed to achieve the manufacturers claimed R value, is 100% correct.
    If more government is the answer, then it's a really stupid question.

  9. #22
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,187
    Quote Originally Posted by mark beiser View Post
    Stop buying the cheap stuff, get Hardcast 1403, with the black butyl rubber!

    It is easier to work with than 1402, especially in hot environments. The reduced hassle, is worth the price.
    hey now!don't be dissing my 1402. it costs me $38+ tax at the other supply house.
    which is why I switched supply houses.

    seriously...I've used 1403, 1402 seals better IMO.
    1403 cuts my fingers, 1402 pulls my fingerprints off!



    installing foil bubble foil & maintaining a 3/4" air space is difficult.
    I never believed it (fbf) worked better than a single sided radiant barrier,
    in a radiant barrier application in an attic @ the roofline.
    and for duct wrap..it is R-2 R-3 AT best, with the 3/4" air space.
    I've never seen anyone achieve 3/4" air space.

    but thats just in my area. it may be the stuff elsewhere??
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  10. #23
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by energy_rater_La View Post
    seriously...I've used 1403, 1402 seals better IMO.
    1403 cuts my fingers, 1402 pulls my fingerprints off!
    Once squeegeed down, neither one is coming off again, basically ever!
    In a 120+ attic, you have to be careful where/how you set down a roll of 1402, or it becomes a permanent fixture.
    If it hasn't been pressed down yet, 1403 can usually be successfully repositioned, and the roll doesn't stick to the equipment/duct.
    The backing tape is also easier to peal off 1402.



    installing foil bubble foil & maintaining a 3/4" air space is difficult.
    I never believed it (fbf) worked better than a single sided radiant barrier,
    in a radiant barrier application in an attic @ the roofline.
    and for duct wrap..it is R-2 R-3 AT best, with the 3/4" air space.
    I've never seen anyone achieve 3/4" air space.
    I've never used it, and never will willingly.
    The times where I've seen it used, the installers failed miserably at installing it with the correct air gap, as instructed by the manufacturer.
    Just looking at the instructions for the stuff, how the spacers are to be cut and installed before wrapping, I can't imagine it is an easy task for even the most diligent installer to maintain the required air gap.
    If more government is the answer, then it's a really stupid question.

  11. #24
    Join Date
    Nov 2012
    Location
    Worcester, MA
    Posts
    16
    Quote Originally Posted by energy_rater_La View Post
    I never use bubble wrap. code allows it in Ma?
    not here. and our codes allow R-6.
    you might find this article of interest.
    http://www.energyvanguard.com/blog-b...diant-Barriers

    I only use R-8 ductwrap for hard pipe, and
    have to special order it, as supply houses stock
    R-6. putting R-6 in a hot vented attic makes no sense
    at all. but code allows it. crazy!
    You've said too much. Guys we need to kill him before this gets out

  12. #25
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by Datsik View Post
    You've said too much. Guys we need to kill him before this gets out
    He lives in Lousyana, isn't that punishment enough?
    If more government is the answer, then it's a really stupid question.

  13. #26
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,187
    best hush up now.. we won't let y'all use our oil & ng.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

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