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Insulation under Radiant Floor Heat

Scott Gregg
Scott Gregg Member Posts: 187
I use Micro foil for any application like this. Downward R value of R-14 and easy to install. (Not itchy either!)

It comes in 250' rolls for 16"oc floors with a staple flange.

www.nofp.com

We are using it in the www.vaenergyhouse.com project along with "The Barrier" for the slab insulation.

Comments

  • Jeff Paquette
    Jeff Paquette Member Posts: 2
    Insulation under Radiant Floor Heat

    I am looking at installing hydronic radiant floor heat on the 1st floor of a new dwelling wet application (1-1/2" light concrete on 3/4" T&G subfloor on 12" wood "I" joists). Should I and with what type insulate between the floor joists of 1st floor.
    Jeff


  • I would generally do an R10 to 13 if the basement is heated, R19 to R30 if it's not, depending on whether the basement itself is insulated. Anything except reflective-only products.
  • paul zeszotarski
    paul zeszotarski Member Posts: 33
    insulation

    If it was me: I would insulate the piping between the furnace and the start and return of where the radiant heat in the floor is. if it was copper pipe in the whole project i would insuate as much as possible. if flexible, find another way.
  • Tombig_2
    Tombig_2 Member Posts: 231
    Scott

    Is that a real R value or a Sears R value? (Apologies to F.Z.)
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    waste of money....

    by itself it does not work....at least not if the basement is cold....lots of talk, fake stats...no results....go w/ what is tried and true....kpc

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  • Scott...

    Thought you might be interested in this tidbit of information...

    For Release: October 5, 2006

    FTC Stops Allegedly False Claims About Insulation Performance

    Seller to Pay More Than $100,000 in Civil Penalties

    An insulation seller will pay a $104,257 civil penalty to settle charges that it made false and misleading performance claims about its insulation product known as “The Barrier.” The settlement prohibits the company and owner from making false and misleading claims and violating the Federal Trade Commission’s R-value Rule.

    The R-value is a measure of an insulation’s resistance to heat flow: the higher the R-value, the greater the insulating power. The FTC’s R-value Rule requires home insulation industry members to provide R-value information based on the results of standard tests. Using the required R-value information, consumers can improve the energy efficiency of their homes by purchasing the right amount of insulation. Misleading advertising about R-values hurts the ability of consumers to make informed purchasing decisions.

    The FTC complaint alleged that advertising claims for “The Barrier” exaggerated its R-value by over 600 percent compared to test results and misrepresented other thermal performance characteristics of the insulation. The FTC also charged that labeling for “The Barrier” and Microfoil insulation did not mention the products’ R-values or explain the meaning of R-value, as required by law. The complaint also alleged other violations of the R-value Rule, including the publication of ads comparing “The Barrier” to competing products without disclosing the R-value for both products.

    The settlement order, against Northwestern Ohio Foam Packaging, Inc., and its owner, Wally Radjenovic, imposes a civil penalty of $104,257. The order prohibits the company and its owner from making false and unsubstantiated claims about the R-value, K-value, thermal performance, energy costs, energy consumption, insulation qualities, or energy-related efficacy of any product. It also prohibits certain false claims related to the thermal conductivity of products. The defendants must provide R-value and other information required under the R-value Rule and are required to comply with the R-Value Rule.

    The Commission vote to refer the complaint and proposed consent decree to the Department of Justice for filing was 5-0. The complaint and consent decree were filed on October 5, 2006 in the U.S. District Court for the Northern District of Ohio by the Department of Justice at the request of the FTC.

    NOTE: The Commission authorizes the filing of a complaint when it has “reason to believe” that the law has been or is being violated, and it appears to the Commission that a proceeding is in the public interest. The complaint is not a finding or ruling that the defendant actually has violated the law.

    NOTE: This consent decree is for settlement purposes only and does not constitute an admission by the defendant of a law violation. A consent decree is subject to court approval and has the force of law when signed by the judge.

    Copies of the complaint and consent decree are available from the FTC’s Web site at http://www.ftc.gov and also from the FTC’s Consumer Response Center, Room 130, 600 Pennsylvania Avenue, N.W., Washington, D.C. 20580. The FTC works for the consumer to prevent fraudulent, deceptive, and unfair business practices in the marketplace and to provide information to help consumers spot, stop, and avoid them. To file a complaint in English or Spanish (bilingual counselors are available to take complaints), or to get free information on any of 150 consumer topics, call toll-free, 1-877-FTC-HELP (1-877-382-4357), or use the complaint form at http://www.ftc.gov/ftc/complaint.htm. The FTC enters Internet, telemarketing, identity theft, and other fraud-related complaints into Consumer Sentinel, a secure, online database available to thousands of civil and criminal law enforcement agencies in the U.S. and abroad.

    MEDIA CONTACT:

    Jacqueline Dizdul,
    Office of Public Affairs
    202-326-2472

    STAFF CONTACT:

    Hampton Newsome,
    Bureau of Consumer Protection
    202-326-2889

    (FTC File No. 052-3192)

    (http://www.ftc.gov/opa/2006/10/foam.htm)

    ME
  • Weezbo
    Weezbo Member Posts: 6,231
    Howdy, Ed. *~/:)

    yes you definitely Should go with the radiant heat.

    Yes you should insulate.

    Insulate the rim and box beam with spray foam and or insulate with blue board cut in place tremco around the edge of the blue foam and spray foam that.

    insulate the floor from beneath with an R-19 ,if you have an open crawl space,maybe go with higher R-value with a sealed vapor barrier, you will be glad that you did in the future. once you paid for that insulation the pain is over, from then on you will be keeping the heat as opposed to attempting to heat the great outdoors.

    should you use tin foil type "reflective" Barrier? honestly, i have yet to see where is was of any benifit whatsoever. thats my take on bubble wrap or whatever. the only product that i have ever seen that would do wonders as a radiant vapor barrier, (though, entirely cost prohibitive )is called something like Eagle Wrap. it was like 5$ a square foot in the late 70's.it is made up of a metal polymer, that you could drag concrete block around in and it would never make a dent in it....sealing it would likely require some space age High dollar goop in order to make an effective seal.

    i belive it has platinum in its structure. the manufactures once asked me what i think it might be used for and i said a vapor barrier for radiant heating...because it is metal it should when used as soemthing of a mat with no holes make a "skin" that redistributed the BTU's most effectively.Aluminum,copper silver gold platinum are very good at conductance..which is a fancy word for an easy path for heat/electricity to travel. it is a partical barrier. meaning it would be something you might consider wrapping your gold electronic control board with, on a orbital mission to Mars..:)

    Did you like that part? :)
  • Steverino
    Steverino Member Posts: 140
    Another approach

    I put sheets of foam on the top of the floor and poured 2" of concrete on top. Easy to install. You do not have to fool around stuffing behind all of the stuff in the floor joists (pipes, wires, duct, etc.). Of course this means doing the framing to allow the extra floor thickness. I put 4 X lumber at all the wall plates and then framed on top of them when the pour was done. Worked out fine.

    I have a bunch of zones so I left gaps between zones and will fill them with decorative wood. Probably overkill, but easy looks interesting.
  • John_82
    John_82 Member Posts: 63
    insultarp

    they got this stuff called "insultarp", made by a company called insulation solutions. It's got an r-10, is reflective & is a vapor barrior. It comes in rolls & lays out like a blanket. It's popular here in jersey... You lay it down, put down wire, or use special clips to hold the tubing to it & then pour on top of it.
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    then your....

    heating bills are much higher and you can grow flowers next to your foundation in Feb.....insultarp is not much better than bubblefoil...it has no mass and it compresses...polystyrene is the tried and true method...kpc

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  • John_82
    John_82 Member Posts: 63


    dude..... it's an r-10

    But hey, there's a product out there for everyone, & if you like the other stuff, then cool, God Bless. Flowers won't grow though....
  • R 10 Schmar Penn...

    I've tested it, and it is NOT a R 10... Closer to an R 4 or 5, if that.

    Don't believe everything you read, especially when the manufacturer is not required to back up their claims...

    ME
  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    Here is a neat...

    web site Robert Bean has a lot of experience on this and other stuff....www.healthyheating.com click on the section on underslab insulation...enjoy. kpc

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  • I thought RIMA themselves tested it at an R 1.65, and that included the dirt, the concrete, gravel, etc.

    Anyway, the stuff is definitely junk, and J, anyone telling you it's an R10 is wrong, wrong, wrong.


  • Mark already presented the heavy info, but basically, while reflectivity can have some benefits in joists, it is not enough by itself, no matter what they claim for R-value. and, I don't trust it to hold up long term.

    No reason to gamble, use real insulation and you know it'll be good for a good long time.
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