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DESIGN GUIDEResidential PEX WaterSupply Plumbing SystemsPrepared forPlastics Pipe Institute, Inc (PPI)105 Decker CourtSuite 825Irving, TX 75062www.plasticpipe.organdPlastic Pipe and Fittings Association (PPFA)800 Roosevelt Road, Bldg. C, Ste. 312Glen Ellyn, IL 60137www.ppfahome.organdPartnership for Advancing Technology in Housing451 7th Street, SWWashington, DC 20410www.pathnet.orgPrepared byNAHB Research Center, Inc.400 Prince George’s BoulevardUpper Marlboro, MD 20774www.nahbrc.orgNovember 2006This document was developed as the result of a consensus process involving the Plastic Pipe Institute, the Plastic and PlasticPipe and Fitting Association, and representatives from numerous piping and fitting manufacturers. It was prepared by theNAHB Research Center, with support and research from the Partnership for Advancing Technology in Housing (PATH).
AcknowledgementsWe would like to thank the following principalcontributors to this Guide:Plastic Pipe and Fittings AssociationGlen Ellyn, IllinoisRichard Church, Mike CudahyPlastics Pipe InstituteIrving, TexasCamille RubeizRehau Inc.Leesburg, VirginiaLance MacNevinUponorApple Valley, MinnesotaRandy KnappVanguard Piping SystemsMcPherson, KansasGary MorganViegaWichita, KansasChristina SmithWattsRadiantSpringfield, MissouriChris HaldimanZurn Plumbing Products GroupCommerce, TexasGary RunyanDepartment of Housing and UrbanDevelopment (HUD)Washington D.C.Dana BresNAHB Research CenterUpper Marlboro, MarylandRobert Fuller, Michael Grothe, Megan Inouye,Shawn Martin, Joseph Wiehagen. Anne Holtz andKim Warren for editorial review, and Edith Craneand Pam Eggleston for layout and design.We would also like to acknowledge the supportof the Partnership for Advancing Technology inHousing (PATH) and the material support of theDelta Faucet Company.CopyrightCopyright 2006 NAHB Research Center,Inc., Plastics Pipe Institute, Plastic Pipe andFittings Association. All rights reserved.DisclaimerNeither the NAHB Research Center,Inc, the Plastics Pipe Institute, the PlasticPipe and Fitting Association, the U.S.Department of Housing and UrbanDevelopment, nor any person acting inits behalf, makes any warranty, expressor implied, with respect to the use of anyinformation, apparatus, method, or processdisclosed in this publication or that such usemay not infringe privately owned rights, orassumes any liabilities with respect to theuse of, or for damages resulting from theuse of, any information, apparatus, method,or process disclosed in this publication,or is responsible for statements made oropinions expressed by individual authors.For Further Information:Please consult the following websites forthe latest version of this publication.Plastics Pipe Institutehttp://www.plasticpipe.org/Plastic Pipe and Fittings p://www.toolbase.org/
Table of ContentsChapter 1 – INTRODUCTION . 1Objective .1Background .1Applications.3How to Use the Design Guide.3Chapter 2 – ADVANTAGES. 5Ease of Installation.5Durability .5Cost Effectiveness .5Energy Efficiency.5Noise Reduction .6Water Conservation.6Environmentally Sound.6Chapter 3 – MATERIAL PROPERTIES . 7Temperature and Pressure .8Flexibility.8Noise and Water Hammer Resistance.8Resistance to Freeze Damage.9Chlorine Resistance .9Corrosion Resistance . 10Ultraviolet (UV) Resistance . 10Inert Material – Safe for Drinking Water .11PEX Piping Dimensions and Flow Characteristics.11Chapter 4 – CODE ACCEPTANCE . 15International Residential Code (IRC-2003).15International Plumbing Code (IPC 2003).16National Standard Plumbing Code (NSPC 2003) .17Uniform Plumbing Code (UPC-2003).17International Code Council (ICC) Evaluation Service Reports(ESR) and Evaluation Reports (ER).17International Association of Plumbing and Mechanical Officials(IAPMO) Guide Criteria . 18C904-06 American Waterworks Association (ANSI/AWWAC904-06). 18Chapter 5 – JOINING METHODS . 19Cold Expansion Fittings with PEX Reinforced Rings . 20Cold Expansion Fittings with Metal Compression Sleeves . 20Metal or Plastic Insert Fittings.21Copper Crimp Ring.21Stainless Steel Clamp . 22Stainless Steel Sleeve. 22Push Type Fittings. 23Standard Specifications for Fittings . 24ASTM F 1807: Standard Specification for Metal Insert FittingsUtilizing a Copper Crimp Ring for SDR9 Cross-LinkedPolyethylene (PEX) Tubing . 24
ASTM F 1960: Standard Specification for Cold ExpansionFittings with PEX Reinforcing Rings for Use with CrossLinked Polyethylene (PEX) Tubing . 24ASTM F 2080: Standard Specification for Cold ExpansionFittings with Metal Compression Sleeves for Use withPEX Pipe . 24ASTM F 2098: Standard Specification for Stainless SteelClamps for Securing SDR9 Cross-Linked Polyethylene (PEX)Tubing to Metal Insert Fittings . 24ASTM F 2159: Standard Specification for Plastic Insert FittingsUtilizing a Copper Crimp Ring for SDR9 Cross-LinkedPolyethylene (PEX) Tubing . 25ASTM F 2434: Standard Specification for Metal Insert FittingsUtilizing a Copper Crimp Ring for SDR9 PEX Tubing andSDR9 PEX-AL-PEX Tubing. 25IAPMO – IGC 188: Removable and Non-Removable Push FitFittings. 25ASSE Standard – 1061. 25Chapter 6 – TYPES OF PEX PLUMBINGSYSTEMS . 27Trunk and Branch . 28Home-Run . 29Remote Manifold. 30Chapter 7 – DESIGN. 31Consult Local Codes .31Optimize Home Designs . 32Select Piping System Design. 33General Rankings of the Systems for Key Factors . 34Example Layouts . 35Colonial Layout. 36Ranch Layout. 39Townhouse Layout. 42Condominium Layout. 45Performance Verification Laboratory Testing . 48Industry Technical Support . 48Plan Pipe Routing, Manifold, and Valve Locations. 48Chapter 8 – PERFORMANCE DATA . 51System Performance Comparison.51Test System Design and Set-up .51Plumbing System Pressure and Flow Test Results . 54Wait Time for Hot Water.61Test Summary . 62Chapter 9 – INSTALLATION . 63Important Notice . 63Revision Policy . 64
Manual Content & Use. 65Other Uses of Cross-Linked Polyethylene (PEX) Tubing. 65Tubing Identification. 66Fitting Identification . 67Applicable Standards. 67Limitations on PEX Use . 67TUBING INSTALLATION PRACTICES. 68General Installation . 68Bending the Tubing. 69Handling and Storing Tubing and Fittings. 69Tubing Supports: . 70Selection and Inspection . 70Support Spacing and Location . 70Horizontal Tubing Support Spacing. 70Expansion/Contraction of Tubing.71Hydraulic Shock (Pressure Surge) .71Manifold Plumbing Systems . 72Parallel Water Distribution Manifold Plumbing (Home-Run)Systems. 73Thawing PEX Tubing Systems . 75Pressure Testing and Inspection of the Completed System . 76Disinfection of Potable Water Systems . 76Buried PEX Water Service Lines. 77Fittings . 77Trench Preparation . 77Laying the Tubing . 77Penetrating Foundation or Basement Walls . 77Slab-on-Grade Installation. 78Laying and Supporting Tubing under Slab . 78Protection of Tubing and Fittings from UV Exposure after thePour . 78Backfilling . 78Technical Data . 79Tubing Dimensions and Weights (ASTM F 876/F 877). 79Friction Losses. 79Friction Loss and Velocity vs. Flow Rate . 80PEX Pl
DESIGN GUIDE Residential PEX Water Supply Plumbing Systems Prepared for Plastics Pipe Institute, Inc (PPI) 105 Decker Court Suite 825 Irving, TX 75062 www.plasticpipe.org and Plastic Pipe and Fittings Association (PPFA) 800 Roosevelt Road, Bldg. C, Ste. 312 Glen Ellyn, IL 60137 www.ppfahome.org and Partnership for Advancing Technology in Housing
