• Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
  • ENGINEERS
  • RADIANT & HYDRONICS
  • INSIGHTS
  • MEDIA
  • RESOURCES
  • EMAGAZINE
  • SIGN UP!
cart
facebook instagram twitter linkedin youtube
  • CONTRACTORS
  • BATH & KITCHEN PRO
  • BUSINESS MANAGEMENT
  • HIGH EFFICIENCY HOMES
  • TECHNOLOGY
  • WATER TREATMENT
  • PMC COLUMNS
  • PMC COLUMNS
  • Dave Yates: Contractor’s Corner
  • John Siegenthaler: Hydronics Workshop
  • Kenny Chapman: The Blue Collar Coach
  • Matt Michel: Service Plumbing Pros
  • Scott Secor: Heating Perceptions
  • ENGINEERS
  • CONTINUING EDUCATION
  • DECARBONIZATION | ELECTRIFICATION
  • FIRE PROTECTION
  • GEOTHERMAL | SOLAR THERMAL
  • PIPING | PLUMBING | PVF
  • PME COLUMNS
  • PME COLUMNS
  • Christoph Lohr: Strategic Plumbing Insights
  • David Dexter: Plumbing Talking Points
  • James Dipping: Engineer Viewpoints
  • John Seigenthaler: Renewable Heating Design
  • Lowell Manalo: Plumbing Essentials
  • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
  • RADIANT COMFORT REPORT
  • THE GLITCH & THE FIX
  • INSIGHTS
  • CODES
  • GREEN PLUMBING & MECHANICAL
  • PROJECT PROFILES
  • COLUMNS
  • SPONSOR INSIGHTS
  • COLUMNS
  • Codes Corner
  • Natalie Forster: Editorial Opinion
  • Guest Editorial
  • MEDIA
  • PODCASTS
  • VIDEOS
  • WEBINARS
  • RESOURCES
  • INDUSTRY CALENDAR
  • DIRECTORIES
  • EBOOKS
  • PM BOOKSTORE
  • CE CENTER
  • MARKET RESEARCH
  • CLASSIFIEDS
  • EMAGAZINE
  • EMAGAZINE
  • ARCHIVE ISSUES
  • CONTACT
  • ADVERTISE
  • PME EMAGAZINE ARCHIVES
search
cart
facebook instagram twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
    • BATH & KITCHEN PRO
    • BUSINESS MANAGEMENT
    • HIGH EFFICIENCY HOMES
    • TECHNOLOGY
    • WATER TREATMENT
    • PMC COLUMNS
      • Dave Yates: Contractor’s Corner
      • John Siegenthaler: Hydronics Workshop
      • Kenny Chapman: The Blue Collar Coach
      • Matt Michel: Service Plumbing Pros
      • Scott Secor: Heating Perceptions
  • ENGINEERS
    • CONTINUING EDUCATION
    • DECARBONIZATION | ELECTRIFICATION
    • FIRE PROTECTION
    • GEOTHERMAL | SOLAR THERMAL
    • PIPING | PLUMBING | PVF
    • PME COLUMNS
      • Christoph Lohr: Strategic Plumbing Insights
      • David Dexter: Plumbing Talking Points
      • James Dipping: Engineer Viewpoints
      • John Seigenthaler: Renewable Heating Design
      • Lowell Manalo: Plumbing Essentials
      • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
    • RADIANT COMFORT REPORT
    • THE GLITCH & THE FIX
  • INSIGHTS
    • CODES
    • GREEN PLUMBING & MECHANICAL
    • PROJECT PROFILES
    • COLUMNS
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
    • SPONSOR INSIGHTS
  • MEDIA
    • PODCASTS
    • VIDEOS
    • WEBINARS
  • RESOURCES
    • INDUSTRY CALENDAR
    • DIRECTORIES
    • EBOOKS
    • PM BOOKSTORE
    • CE CENTER
    • MARKET RESEARCH
    • CLASSIFIEDS
  • EMAGAZINE
    • EMAGAZINE
    • ARCHIVE ISSUES
    • CONTACT
    • ADVERTISE
    • PME EMAGAZINE ARCHIVES
  • SIGN UP!
Columns

The Best Of Both Worlds: PEX-AL-PEX

By Julius Ballanco P.E., CPD
June 19, 2000
The name isn't very catchy, but PEX-AL-PEX has the benefits of both metal and plastic pipe.

I was first introduced to a multi-layer PEX-AL-PEX pipe about 15 years ago. A company executive explained to me how the pipe was made and how they planned to distribute it in North America. What kept running through my mind at the time was what is this good for?

When I couldn't hold back any more, I finally blurted out, "Why would somebody want a pipe like this?" I could see the hurt look in the executive's eyes. I went on to explain that it was not my intention to insult him, I was just curious as to why a contractor would want to use this type of pipe. I went on to say that if a contractor wanted metallic piping they would use copper, and if they wanted plastic pipe, they would use plastic pipe.

His eyes lit up as he quickly responded, "Don't you understand, with PEX-AL-PEX, you get the best of both worlds. There is the high quality of a corrosion-resistant PEX plastic pipe on the interior, and the rigidity of a metallic pipe with the aluminum inner layer."

It quickly made sense to me that there could be a market for this product. PEX has been established as one of the highest quality plastics for use in potable water systems. Hence, the water is in contact with this high-quality plastic. However, unlike PEX, when you form the pipe, it stays in place. One of the complaints I always hear from contractors is that a PEX installation looks like spaghetti. Others say that the plumbing looks like an electrician installed it.

With PEX-AL-PEX, the aluminum inner layer keeps the pipe rigid, as if it were a metallic piping system. Unlike metallic pipe, it can bend easily in your hand and take the shape you determine. Hence, elbows and 45's are unnecessary fittings. The feel of the aluminum also assures that the bends do not exceed the bending radius of the pipe.

True Benefits

PEX-AL-PEX got its start in North America in radiant heating systems. It is an excellent material for this application, since the pipe retains its shape. When PEX is used, additional pipe supports are required to hold the pipe in place until the concrete or gypcrete is installed.

Lately, the PEX-AL-PEX manufacturers have been pushing to use the pipe in potable water distribution systems. Who has not seen the clever IPEX ads that ask, "Where's my Kitec?"

PEX-AL-PEX has the same material exposed to the water as PEX. Hence, it would only be natural that if PEX is acceptable for potable water piping systems, so is PEX-AL-PEX. The plumbing codes are finally catching up to this concept. PEX-AL-PEX is currently permitted for potable water in the International Plumbing Code. The material is also listed with the Uniform Plumbing Code.

Another question on contractors' minds is, "How do we join the pipe?" There are two popular methods of joining PEX-AL-PEX. One method uses a crimp fitting, the other a compression fitting. Both fittings are insert-type fittings. The crimp fitting requires a crimping tool, while the compression fittings are made with normal wrenches. Most of the manufacturers have o-rings as part of their fittings. This is to ensure the most positive joint for the piping system.

The newer crimp and compression fittings are now interchangeable between manufacturers. Previously, the fittings were tied to the particular manufacturer of the pipe.

While IPEX's Kitec pipe has been one of the standard bearers in the PEX-AL-PEX business, there are other manufacturers introducing their versions of the pipe. This is a strong indicator that the material is starting to catch on with contractors.

One of the new PEX-AL-PEX pipes available is from Stadler-Viega. They have a very clever concept in that the color of the pipe is copper. Rather than using fittings similar to other PEX-AL-PEX pipe, Stadler-Viega has a tool that peels away the outer layer of PEX and the layer of aluminum. The fittings used are the standard PEX press fittings used for the company's PEX pipe. The idea is to have only one set of fittings for both their PEX and PEX-AL-PEX pipe.

Drawbacks

The one system I do not recommend for PEX-AL-PEX is a home-run style manifold piping system; PEX is known as the piping system for this style of manifold system. PEX-AL-PEX is not as flexible to accommodate this type of installation. PEX-AL-PEX is really intended for conventional straight-piping systems or within the slab.

Another concern is that PEX-AL-PEX has not been listed for residential sprinkler systems. However, that could change. As combined residential sprinkler systems gain in popularity, PEX-AL-PEX will need a listing to stay competitive with other piping systems.

I haven't found any other real downsides to the material. A major factor to consider is whether you want a rigid pipe or a flexible pipe.

The one complaint I do have is in the name of the pipe. PEX-AL-PEX is a mouthful. I think they should have come up with a better name or simpler acronym. Perhaps just shortening the name to PAP pipe would be preferable. Maybe if everybody started calling it Pap pipe, it will catch on. Or, how about layered pipe? Anything is better than PEX-AL-PEX.

In the meantime, the way I see it, the PEX-AL-PEX market is a growing market. The use of this type of piping material is expanding across the country. If you haven't tried it yet, give it a shot. It really does offer the best of both worlds.

Share This Story

Looking for a reprint of this article?
From high-res PDFs to custom plaques, order your copy today!

Ballancojuliusvwhite 200

Julius Ballanco, P.E., CPD, F-ASPE, is president of J.B. Engineering and Code Consulting, P.C. in Munster, Ind. He can be reached at by email at jbengineer@aol.com.

Recommended Content

JOIN TODAY
to unlock your recommendations.

Already have an account? Sign In

  • Worker using the Milwaukee Tool SWITCH PACK drain cleaner

    Pipeline profits: Drain cleaning, pipe inspection create opportunities

    Drain cleaning and inspection services offer lucrative...
    Green Plumbing and Mechanical
    By: Nicole Krawcke
  • Uponor employee, Arturo Moreno

    The reinvestment in American manufacturing and training

    Plumbing & Mechanical Chief Editor Nicole Krawcke and...
    Plumbing News
    By: Nicole Krawcke and Natalie Forster
  • March 2024 Women in Plumbing hero image of woman engineer overlayed by circle of hexagon shapes with numbers from 1 to 10

    Celebrating 10 Influential Women in the Plumbing Industry

    Celebrating Women's History Month and Women in...
    Plumbing News
    By: Nicole Krawcke
Subscribe For Free!
  • eNewsletters
  • Online Registration
  • Subscription Customer Service
  • eMagazine
  • Manage My Preferences

Bell & Gossett Illustrates Path to Net-zero at AHR Expo

Bell & Gossett Illustrates Path to Net-zero at AHR Expo

NIBCO Press Solutions

NIBCO Press Solutions

AI can boost efficiency and profitability for plumbing, HVAC contractors

AI can boost efficiency and profitability for plumbing, HVAC contractors

IPEX celebrates grand opening of new Florida distribution center

IPEX celebrates grand opening of new Florida distribution center

More Videos

Sponsored Content

Sponsored Content is a special paid section where industry companies provide high quality, objective, non-commercial content around topics of interest to the Plumbing & Mechanical audience. All Sponsored Content is supplied by the advertising company and any opinions expressed in this article are those of the author and not necessarily reflect the views of Plumbing & Mechanical or its parent company, BNP Media. Interested in participating in our Sponsored Content section? Contact your local rep!

close
  • J.J. Keller CMV vehicles on road
    Sponsored byJ. J. Keller & Associates, Inc.

    The dash cam game-changer for small business safety

Popular Stories

The interior of a government building.

President Trump signs executive order promoting skilled trades and apprenticeships

Figure 1 is a sketch of the flow problems of the current plumbing system.

Hydronic heating glitch solved: Why adding a circulator won't fix primary loop flow issue

Underfloor heating installation with drain sewer hole in bathroom close up on water floor heating.

Using hydronics to leverage time-of-use electrical rates

PM BEMIS June 25 Free Webinar: Optimizing Plumbing Solutions for Single-Family, Multi-Family & Public Spaces

Events

November 13, 2024

Future Proofing MEP: Navigating the 2026 High Efficiency Water Heating Standards

Join our deep dive into DOE’s new standards so you can future-proof your MEP practice.

EARN: 0.1 ASPE CEU; 1 AIA LU/HSW; 0.1 IACET CEU*; 1 PDH

View All Submit An Event

Poll

Will business be up or down in 2025?

Do you anticipate business in 2025 to be up or down in comparison to 2024?
View Results Poll Archive

Products

The Water Came To A Stop

The Water Came To A Stop

See More Products

Download the FREE Water Conservation, Quality & Safety eBook: Plumbing Trends Increasing Safe Water Availability

Related Articles

  • It's The Solids That Run Away
    Julius Ballanco

    See More
  • Plumbing Design Of Residential Sprinklers

    See More
  • Julius Ballanco

    Mysteries of wet venting in bathrooms

    See More
×

Keep your content unclogged with our newsletters!

Stay in the know on the latest plumbing & piping industry trends.

JOIN TODAY!
  • RESOURCES
    • Advertise
    • Contact Us
    • Directories
    • Store
    • Want More
    • Supply House Times
  • SIGN UP TODAY
    • Create Account
    • eMagazine
    • eNewsletter
    • Customer Service
    • Manage Preferences
  • SERVICES
    • Marketing Services
    • Reprints
    • Market Research
    • List Rental
    • Survey/Respondent Access
  • STAY CONNECTED
    • LinkedIn
    • Facebook
    • Instagram
    • YouTube
    • X (Twitter)
  • PRIVACY
    • PRIVACY POLICY
    • TERMS & CONDITIONS
    • DO NOT SELL MY PERSONAL INFORMATION
    • PRIVACY REQUEST
    • ACCESSIBILITY

Copyright ©2025. All Rights Reserved BNP Media.

Design, CMS, Hosting & Web Development :: ePublishing

search
cart
facebook instagram twitter linkedin youtube
  • Sign In
  • Create Account
  • Sign Out
  • My Account
  • NEWS
  • PRODUCTS
  • CONTRACTORS
    • BATH & KITCHEN PRO
    • BUSINESS MANAGEMENT
    • HIGH EFFICIENCY HOMES
    • TECHNOLOGY
    • WATER TREATMENT
    • PMC COLUMNS
      • Dave Yates: Contractor’s Corner
      • John Siegenthaler: Hydronics Workshop
      • Kenny Chapman: The Blue Collar Coach
      • Matt Michel: Service Plumbing Pros
      • Scott Secor: Heating Perceptions
  • ENGINEERS
    • CONTINUING EDUCATION
    • DECARBONIZATION | ELECTRIFICATION
    • FIRE PROTECTION
    • GEOTHERMAL | SOLAR THERMAL
    • PIPING | PLUMBING | PVF
    • PME COLUMNS
      • Christoph Lohr: Strategic Plumbing Insights
      • David Dexter: Plumbing Talking Points
      • James Dipping: Engineer Viewpoints
      • John Seigenthaler: Renewable Heating Design
      • Lowell Manalo: Plumbing Essentials
      • Misty Guard: Guard on Compliance
  • RADIANT & HYDRONICS
    • RADIANT COMFORT REPORT
    • THE GLITCH & THE FIX
  • INSIGHTS
    • CODES
    • GREEN PLUMBING & MECHANICAL
    • PROJECT PROFILES
    • COLUMNS
      • Codes Corner
      • Natalie Forster: Editorial Opinion
      • Guest Editorial
    • SPONSOR INSIGHTS
  • MEDIA
    • PODCASTS
    • VIDEOS
    • WEBINARS
  • RESOURCES
    • INDUSTRY CALENDAR
    • DIRECTORIES
    • EBOOKS
    • PM BOOKSTORE
    • CE CENTER
    • MARKET RESEARCH
    • CLASSIFIEDS
  • EMAGAZINE
    • EMAGAZINE
    • ARCHIVE ISSUES
    • CONTACT
    • ADVERTISE
    • PME EMAGAZINE ARCHIVES
  • SIGN UP!