Results 1 to 10 of 10

Thread: pex insulation

  1. #1
    robert smith's Avatar
    robert smith Guest

    Default pex insulation

    i have a pex manifold surface mounted (on the drywall) in a utilty closet. the wall that this manifold is mounted on happens to be an exterior wall. an inspector has informed me that i need to insulate the pex lines at this location. he says the code explicitly specifies "pex shall be insulated within 24" of an exterior wall"

    this closet is inside the climate controlled living area of my house. my living area will never freeze, especially in south texas. this doesn't make any sense. can anyone expand on this code requirement or if it even exists?

    Similar Threads:
    F.I.R.E. Services

  2. #2
    Join Date
    Mar 2012
    Location
    North Central Texas
    Posts
    472

    Default Re: pex insulation

    The supply piping requires insulation in order to protect it from freeze damage as per IRC P2603.6 and/or the PEX manufacturer. P2603.6 Freezing. In localities having a winter design temperature of 32F (0C) or lower as shown in Table R301.2(1) of this code, a water, soil or waste pipe shall not be installed outside of a building, in exterior walls, in attics or crawl spaces, or in any other place subjected to freezing temperature unless adequate provision is made to protect it from freezing by insulation or heat or both. Water service pipe shall be installed not less than 12 inches (305 mm) deep and not less than 6 inches (152 mm) below the frost line.

    ***IMPORTANT*** You Need To Register To View Images ***IMPORTANT*** You Need To Register To View Images
    Texas Inspector
    http://www.texasinspector.com
    What the plainspoken man lacks in subtlety, he makes up in clarity.

  3. #3
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: pex insulation

    Quote Originally Posted by robert smith View Post
    i have a pex manifold surface mounted (on the drywall) in a utilty closet. the wall that this manifold is mounted on happens to be an exterior wall. an inspector has informed me that i need to insulate the pex lines at this location. he says the code explicitly specifies "pex shall be insulated within 24" of an exterior wall"

    this closet is inside the climate controlled living area of my house. my living area will never freeze, especially in south texas. this doesn't make any sense. can anyone expand on this code requirement or if it even exists?
    Is the utility closet inside the home? If it is on the drywall is there insulation behind it in the stud cavity/bay? Manifolds that I have seen are usually in the conditioned airspace of the home or an area that will not freeze. With you being in Houston, you could just about have the PEX on the back porch of the house and it wouldn't freeze!

    Last edited by Scott Patterson; 09-01-2012 at 10:31 AM.
    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  4. #4
    robert smith's Avatar
    robert smith Guest

    Default Re: pex insulation

    aaron, if this is the code, i don't see a "within 24 inch of an exterior wall" (as the inspector quoted) anywhere in there.
    scott, the closet is inside the house, on the drywall of an insulated exterior stud wall. you're right, freezing is normally not our biggest problem in houston; especially inside my house. i'd be more concerned about the invisible fire outside!
    still think if that 24 inch rule is actually code, it's a dumb code. thanks, guys.


  5. #5
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: pex insulation

    Quote Originally Posted by robert smith View Post
    aaron, if this is the code, i don't see a "within 24 inch of an exterior wall" (as the inspector quoted) anywhere in there.
    scott, the closet is inside the house, on the drywall of an insulated exterior stud wall. you're right, freezing is normally not our biggest problem in houston; especially inside my house. i'd be more concerned about the invisible fire outside!
    still think if that 24 inch rule is actually code, it's a dumb code. thanks, guys.
    If it is inside the conditioned part of the home and on an insulated wall then it is a moot point.

    Ask the inspector to cite the specific code that would not allow for this.

    I know of no code or manufactures requirement that would not allow this type of install. Now if it was in an unconditioned/uninsulated garage or storage room then it would be an issue.

    Yes, codes do not always equal common sense!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  6. #6
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,258

    Default Re: pex insulation

    I've never heard of any 24 inch rule. That's just silly. You would have to insulate a toilet line inside the bathroom if it came up through the floor of the bathroom. I'd ask, politely, to see the rule in writing. No need to antagonize the inspector if you'll need him later.

    Jim Robinson
    New Mexico, USA

  7. #7
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: pex insulation

    Quote Originally Posted by Aaron Miller View Post
    The supply piping requires insulation in order to protect it from freeze damage as per IRC P2603.6 ...
    Aaron,

    Nope, it does not say that - go back and read it again.

    Also read P3103.2.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  8. #8
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: pex insulation

    Quote Originally Posted by Aaron Miller View Post
    In localities having a winter design temperature of 32F (0C) or lower as shown in Table R301.2(1) of this code ...
    Table R301.2(1) refers you to Appendix D of the IPC, and Appendix D shows that 32F line right about ... (I'm sure you've heard me say this before) ... right about along I-10 (Interstate 10) from Jacksonville west.

    In other words, not much of the country is not included in being above that "I-10 freeze line" (as I refer to it - you've probably heard me say that before too). If you are near or above I-10, you should be adhering to the freeze protection sections of the code - or at least checking to see where you are located in relation to Appendix D areas.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  9. #9
    Join Date
    Mar 2012
    Location
    North Central Texas
    Posts
    472

    Default Re: pex insulation

    Quote Originally Posted by Jerry Peck View Post
    Aaron,

    Nope, it does not say that - go back and read it again.

    Also read P3103.2.
    Are you claiming that supply plumbing requires no insulation?

    Last edited by Aaron Miller; 09-01-2012 at 07:17 PM. Reason: typo
    Texas Inspector
    http://www.texasinspector.com
    What the plainspoken man lacks in subtlety, he makes up in clarity.

  10. #10
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: pex insulation

    Quote Originally Posted by Aaron Miller View Post
    Are you claiming that supply plumbing requires no insulation?
    Nope.

    I'm simply pointing out that you have *added words* which are not in there, and in doing so you are *limiting* what you say the code calls for to less than what is actually in the code.

    Go back and read it again, and read that other section too.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •