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  1. #1
    Hello,
    Thinking about replacing all my ducts (old steel ducts, that are rusted), with new flexduct, and taking out all the ducts in my crawlspace.

    1. What questions do I need to ask a contractor when they come out regarding parts, materials, etc??

    2. If I may be building a 2nd floor to my home in a few years should I wait until then, in case I need to do futher major revisions to the HVAC system?

    3. The heater is inside the home in a hall closet... if I add a 2nd floor, would they probably install a second heater, say in the garage for the upstairs, or redo the ductwork so the same location can "power" the entire house.

    Thanks!!

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    it is not a good idea to install flex in a crawl space
    if you are wanting to replace the duct work then do it woth only metal and insulate it with duct wrap

  3. #3
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    If you have a crawspace underneath the home I would recoomend that you use flex because of varmits eating holes in the ductwork. If you mean the attic crawlspace it would be fine.

  4. #4
    Thanks for the replies,
    In terms of cost, how much is the cost for sheetmetal ducts vs. flex duct?

    Thanks

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,063
    It cost more, thats all we're allowed to say.

    Please read site rules. No pricing questions allowed.
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  6. #6
    Join Date
    May 2005
    Location
    Mississippi
    Posts
    102
    Originally posted by aircooled53
    If you have a crawspace underneath the home I would recoomend that you use flex because of varmits eating holes in the ductwork. If you mean the attic crawlspace it would be fine.
    I think this was a typo? I believe aircooled mean to say he "wouldn't" recommend flex due to the varmits!.

    If not, I apologize in advance to aircooled53.

    regards

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,063
    Originally posted by biscuitnt
    Originally posted by aircooled53
    If you have a crawspace underneath the home I would recoomend that you use flex because of varmits eating holes in the ductwork. If you mean the attic crawlspace it would be fine.
    I think this was a typo? I believe aircooled mean to say he "wouldn't" recommend flex due to the varmits!.

    If not, I apologize in advance to aircooled53.

    regards

    maybe he meant use it because its good job security for the contractor replacing it every few years.

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  8. #8
    Join Date
    Dec 2002
    Location
    in a house, Appomattox, Va.
    Posts
    3,302
    If I had pests, I'd make them "go away". But that's me.

    They're partial to ductboard, though
    Col 3:23


    questions asked, answers received, ignorance abated

  9. #9
    Join Date
    Jan 2004
    Posts
    157
    Here they outlawed flex on resi just five feet on commerical so i would say go with metal and have it mastic sealed before it is insulated to get the best results.

  10. #10
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    maybe you guys are lucky -- I have had mice in the attic also --

    use metal ducts -- unless you have the whole duct system redesigned, which is not a bad idea.

    are any of the existing ducts rusted thru?

    is the crawl earth covered with pvc? are walls insulated & vents closed?

    read at BUILDINGSCIENCE.com

    harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!

  11. #11
    Join Date
    Nov 2000
    Location
    Waco, Texas, USA
    Posts
    6,153
    Originally posted by willy1
    Here they outlawed flex on resi just five feet on commerical so i would say go with metal and have it mastic sealed before it is insulated to get the best results.
    Have they outlawed the sale of flex? No. Then its not outlawed, you just think it is. I just love these new rules without enforcement.
    "And remember my sentimental friend......that a heart is not judged by how much you love, but by how much you are loved by others" - Wizard of Oz.

  12. #12
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    Left out the---------n't--------wouldn't. Been a bad week lost my brother so I guess that I'm allow a few mistakes.

    The difference is that metal ductwork contracts (heat&cold) and that flex has a higher restriction rate.
    But if hung and installed properly flex ductwork in attic crawlspace will work fine. But, if it is underneath the home in crawlspace that maybe cat's,possum,rats,mice,or any other varmits native to your area I DO Not recommend it.

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,063
    Sorry to hear about your brother.
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