Page 1 of 2 12 LastLast
Results 1 to 13 of 21
  1. #1
    Join Date
    Nov 2004
    Posts
    43
    Can someone turn this into english: "when supply or return ducts pass through the floor, a 1/4 inch thick nocombustible resilient gasket must be used between the duct, unit and floor."

    I'm also trying to figure out why most of the jobs I see don't have this gasket.

    Why wouldn't register boots in floors/walls/celings need a gasket like this or does mastic sealant qualify.

    None of the uppers I have talked to can explain this very good. Thanks for any help.

  2. #2
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,405
    Maybe I'm reading this wrong too, but could they be talking about running a duct in a chase (from a basement to an attic or another floor), sealing the gap so that fire can't go up that chase?

  3. #3
    Join Date
    Nov 2004
    Posts
    43
    Filling the gap in the stud cavity around the duct would make sense. I think that is what they're talking about. Where is building code when you need him

  4. #4
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    you usually have to flash (firestop) it off and fire caulk it.
    FILL OUT YOUR PROFILE!!

  5. #5
    Join Date
    Nov 2004
    Posts
    43
    For the sake of clarity can you define 'firestop' ,and why in the heck would one only have to do this occasionally if it is that important.

  6. #6
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    i don't know where you're from because YOU DIDN'T FILL OUT YOUR PROFILE. around here... when you penetrate a top/bottom plate you have to put break angle metal when the plate used to be and firecaulk the rest of the penetration next to the duct (metal of course). stoppping the smoke/fire from going from one floor to another.
    FILL OUT YOUR PROFILE!!

  7. #7
    Join Date
    Nov 2004
    Posts
    43
    Tried editing my profile one time , but the site was unresponvsive (sluggish)...obviously it didn't work. I'll try again though. St. Louis is where I be. No inspectors, nothing, I must figure out the code/regs/right-way-to-do-it on my own, and of course from HVAC-Talk. Thanks

  8. #8
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    that's why we're here
    FILL OUT YOUR PROFILE!!

  9. #9
    Join Date
    Nov 2004
    Posts
    43
    Hey Tinner or whomever,

    If Stl doesn't have mechanical inspectors then would this code be enforceable. Public works is uncapable of disseminating information about regulations or codes for installing HVAC systems. Where is the line drawn when there is such a gray area in the city government??? Maybe someone out there has experience with situations like this.

  10. #10
    Join Date
    Aug 2003
    Posts
    1,841
    Mechanical Inspectors most towns don't have them.

    What wrong with just caulk or fire caulk?Thats is what most of us do.

  11. #11
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,405
    I know this is in the residential section, but this is in a residential house right?

    In our commercial jobs, whether there's a fire/smoke damper or not, we have to angle around the duct and fire caulk it. Residential we don't, but I typically at least flash it in with angle... part fire stop, part easy hanger system ='s good reason to do it.

  12. #12
    Join Date
    Nov 2004
    Posts
    43
    Yes it is a resi building. Companies here use entire stud cavities w/o ducting as returns from the second floor to the return trunk in the basement and no firestop obviously. I guess it's legal.

  13. #13
    Join Date
    Aug 2003
    Posts
    1,841
    In wv where I live they use the walls as duct or pan it for returns only when I lived in nc you couldn't do that you need to take to someone in you area.No one else will be able to help you.

    [Edited by framehvac on 02-22-2005 at 01:01 AM]

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event