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  1. #1
    Join Date
    Dec 2007
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    69

    Sealng and repairing vents/boots: different mastics for different jobs?

    Is there a preferred mastic to use for sealing the outside of vents in an attic?

    How about for work that may be partially on the inside of vents? I found a hack job in my house where the previous owners cut a hole in the bottom of a floor vent boot and used the hole to blow air to a vent in the basement (they didn't even use sheet metal to cover over the exposed insulation between floors! ).

    For this job, I want to abandon the basement vent (totally unecessary vent). I was thinking of having the someone use sheet metal to cover over the hole that was made in the bottom of the boot and sealing the edges with mastic.

    First is okay to have a decent amount of mastic in the air way? I mean will it break down and dust or off-gas or anything?

    Secondly, I've seen types of mastic that say fiber reinforced. I am assuming this is fiberglass? I feel leery of allowing someone to use anything with fiberglass in it within the airway. Can we get away with using a non-fiber reinforced mastic?

    I will be having someone come out to install a Lennox or April Air filter as well as fix the mediocre install of my new hvac so I will be discussing this with them. I want to be informed.

  2. #2
    Join Date
    Dec 2007
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    69
    Any advice at all on the fiber vs non-fiber mastic?

  3. #3
    Join Date
    Jun 2007
    Location
    Pigeon Forge, TN
    Posts
    293
    I use aluminum foil tape pretty much exclusively. The only time I use a mastic is on a tva job that *requires mastic tape be used on all of the metal duct seams. (In Tennesse the customer can get a rebate from tennesse valley authority for putting in a heat pump rather than gas and it must be installed per their codes).

    As far as what type of mastic, I use whatever the supply house has. I don't think your choice of tape is gonna have any great impact on anything and I've never heard of a tape that was made for hvac disintegrating, releasing fiberglass particles or noxious fumes, its just tape. Get the real stuff though from an hvac supply house and you should be fine.

  4. #4
    Join Date
    Dec 2007
    Posts
    69
    Quote Originally Posted by JumpSteady View Post
    I use aluminum foil tape pretty much exclusively. The only time I use a mastic is on a tva job that *requires mastic tape be used on all of the metal duct seams. (In Tennesse the customer can get a rebate from tennesse valley authority for putting in a heat pump rather than gas and it must be installed per their codes).

    As far as what type of mastic, I use whatever the supply house has. I don't think your choice of tape is gonna have any great impact on anything and I've never heard of a tape that was made for hvac disintegrating, releasing fiberglass particles or noxious fumes, its just tape. Get the real stuff though from an hvac supply house and you should be fine.
    I was more worried about the fiberous mastic disintegrating or releasing fibers over time.

    While we're at it, is it okay to use the foil tape inside of the air vents for leaks in ceiling boots?

  5. #5
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,046
    Quote Originally Posted by viche View Post
    I was more worried about the fiberous mastic disintegrating or releasing fibers over time.

    While we're at it, is it okay to use the foil tape inside of the air vents for leaks in ceiling boots?
    Any latex mastic that they use, plain or re-enforced with fiberglass will be fine.

    Do not use tape on the airside of the ductwork.

    You are in Elkton?

  6. #6
    Join Date
    Dec 2007
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    69
    Quote Originally Posted by second opinion View Post
    Any latex mastic that they use, plain or re-enforced with fiberglass will be fine.

    Do not use tape on the airside of the ductwork.

    You are in Elkton?

    No, but pretty close by. Why?

    Why can't tape be used on the air side of a supply boot?

  7. #7
    Join Date
    Jun 2005
    Location
    The Gray Northwest
    Posts
    661
    Tape on the inside will not stay attatched. I prefer mastic for all sealing applications because it's permenent. You can google duct mastics and they will state the VOC content. You will find that 99% of them have no or very little VOC's. The reinforcement fiber is for patching large gaps on high velocity systems. You probably don't need it. Be sure to use a mastic that has the correct temp rating for your system.

  8. #8
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
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    Quote Originally Posted by viche View Post
    No, but pretty close by. Why?

    Why can't tape be used on the air side of a supply boot?
    The mastic on the tape will dehydrate and blow loose in the system or cause whisteling sounds.

    Type in Trane Comfort Specialist and type in your zip codes 42/43 and you will get 10 dealers to choose to fix your problems. You never told us who your current dealer is. There are only two on these lists that I would not recommend several I know nothing about.
    Last edited by second opinion; 02-05-2008 at 09:38 AM.

  9. #9
    Join Date
    Dec 2007
    Posts
    69
    Quote Originally Posted by second opinion View Post
    The mastic on the tape will dehydrate end blow loose in the system or cause whisteling sounds.

    Type in Trane Comfort Specialist and type in your zip codes 42/43 and you will get 10 dealers to choose to fix your problems. You never told us who your current dealer is. There are only two on these lists that I would not recommend several I know nothing about.
    Thanks for the link. Who would you and wouldn't you recommend on that list? My dealer is on the list.

  10. #10
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
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    Quote Originally Posted by viche View Post
    Thanks for the link. Who would you and wouldn't you recommend on that list? My dealer is on the list.
    What are the last 4 digits of the phone #?

  11. #11
    Join Date
    Dec 2007
    Posts
    69
    Quote Originally Posted by second opinion View Post
    What are the last 4 digits of the phone #?
    You are persistent. Isn't there some type of etiquette that says I shouldn't bad mouth companies that I have a 10 year warranty through? It would be just as easy for you to tell me who to avoid.

    I'd be glad to share it with you privately, but I don't feel comfortable posting it in the open. I Hope you understand. I'm still really interested in your company suggestions though. I need to have someone come out soon.

    Have you heard of H & C Inc in laurel MD? They claim to be a couple of signatures away from Comfort Specialist Certification. I talked to someone there who seemed knowledgeable. Offered to send out their service manager.

  12. #12
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,046
    Quote Originally Posted by viche View Post
    You are persistent. Isn't there some type of etiquette that says I shouldn't bad mouth companies that I have a 10 year warranty through? It would be just as easy for you to tell me who to avoid.

    I'd be glad to share it with you privately, but I don't feel comfortable posting it in the open. I Hope you understand. I'm still really interested in your company suggestions though. I need to have someone come out soon.

    Have you heard of H & C Inc in laurel MD? They claim to be a couple of signatures away from Comfort Specialist Certification. I talked to someone there who seemed knowledgeable. Offered to send out their service manager.
    Your 10 year warranty can be transfered to any Trane dealer that is in the warranty program.

    The dealer that you chose should have the integrity to step up to the plate and resolve your problems with your new system. It is not your responsibility to correct his deficiencys.

    As far as the 10 year warranty is concerned, if they could not install a new system correctly what gives you the confidence that they can repair it!

    Right now you have a two stage system that is wired as a single stage and they are telling you "well thats all I can do but thanks for the money".

    If you have not already filed a consumer complaint with Trane 903-581-3660 I would make that my #1 priority of the day. Ask them why you where told that your new two stage system should be wired as a single stage "per Trane", and then post there response.

  13. #13
    Join Date
    Dec 2007
    Posts
    69
    Quote Originally Posted by second opinion View Post
    Your 10 year warranty can be transfered to any Trane dealer that is in the warranty program.

    The dealer that you chose should have the integrity to step up to the plate and resolve your problems with your new system. It is not your responsibility to correct his deficiencys.

    As far as the 10 year warranty is concerned, if they could not install a new system correctly what gives you the confidence that they can repair it!

    Right now you have a two stage system that is wired as a single stage and they are telling you "well thats all I can do but thanks for the money".

    If you have not already filed a consumer complaint with Trane 903-581-3660 I would make that my #1 priority of the day. Ask them why you where told that your new two stage system should be wired as a single stage "per Trane", and then post there response.
    I'm not relying on them to fix it. I'd like to find another company. Can you make a suggestion from that list since you said you knew a couple of them?

    The consumer is at a huge disadvantage here. No-one on the other side of a fence wants to recognize and deal with a problem. The installer claims that it is working correctly. The Trane factory-rep says that the wiring fix is Trane approved. Whenever I call Trane about a question they refer me to the distributor in my area where the factory rep works. At then end of the day they will just claim that my vents are leaking or poorly insulated and the installer will claim that he is not responsible for existing ductwork. Am I wrong?

    On another note, can a two stage system be converted to 1 stage via thermostat settings so that at least I know the air handler ramp profile being used is for second stage? At least until I get this all resolved?

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