PEX Plumbing – Trunk & Branch Plumbing – Residential PEX Manifold Plumbing


PEX Plumbing – Trunk & Branch Plumbing – Residential PEX Manifold Plumbing – Home Run Plumbing Layouts

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Residential plumbing system layouts come in a variety of shapes and sizes, with a number of different types of plumbing layouts, and piping materials.

Trunk and Branch Residential Plumbing Layouts

For decades, trunk and branch (T B) plumbing layouts have been used by plumbers and home builders for water distribution using iron pipe, copper pipe, and rigid pipe. Trunk and branch plumbing layouts use a main trunk line to supply various branch take-offs to specific fixtures.

The trunk line services numerous branch lines, each branch lines serving generally one to three closely grouped outlets, such as in a bathroom where there may be one or two sinks, a toilet and a shower.

With trunk and branch plumbing the plumber usually uses rigid pipe, and generally follows the beams and trusses when installing the piping. This means extensive use of elbows and longer pipe runs than if the pipe was run directly from the water heater to the fixture.

Recirculating systems don’t work will with trunk and branch plumbing layouts, since they don’t include the branch lines in the circulating loop. (See Fig 1) Demand hot water systems suffer similar problems, although one could use multiple demand pumps.

Pex plumbing installation

Residential PEX Manifold Plumbing Systems

A relative newcomer to the residential plumbing system is the PEX manifold plumbing layout. A manifold system is similar in a way to the trunk and branch system in that it has a single trunk line leading to a manifold which in turn sends a single branch line to each fixture or closely spaced group of fixtures such as in a bathroom. (Fig 2)

In some situations the manifold type plumbing layout can work well with recirculating systems and demand hot water systems. For example, if the trunk lines are long, a pump could be placed at the manifold to rapidly fill the trunk lines. The branch lines being much smaller in diameter hold a much smaller volume of water and thus have a high flow rate.

With high flow rates the deliver is rapid and wastes only a small amount of water.

These systems are sometimes referred to as remote manifold systems. These systems are sometimes combined into a hybrid system, for instance, it could have two or three trunk lines with a remote manifold at the end of each trunk.

All kinds of combinations are possible. A single trunk line could have several flow-through manifolds and one at the end of the trunk line.

With PEX manifold systems shut off valves are often located at each outlet on the manifold allowing you to turn off individual fixtures for repair or replacement without shutting off the water to the whole house.

Pex plumbing installation

Home Run Plumbing Layouts

PEX piping systems make it ideal for use in home-run plumbing systems. In this design, all fixtures are fed from dedicated piping that runs directly from central manifolds. The hot water manifold should be located in close proximity to the hot water source to ensure fast and efficient delivery.

Because inline fittings are eliminated, pressure losses along the line are reduced, allowing the piping size to be reduced for certain fixtures. Three-eighths-inch piping may be used for lower flow applications and 1/2-inch piping is recommended for higher flow applications.

If the manifold is installed using a valve at each outlet, many plumbing codes do not require a second valve at the fixture. This speeds installation and adds convenience.

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Uponor Pex Repipe – The World’s First, Best, And Most Widely Used System For Single Family Homes And Residential Units.

What is PEX?

PEX is an acronym for crosslinked polyethylene. It is a flexible, durable, proven piping product that has been used in plumbing systems for more than 20 years. PEX tubing won’t pit, scale or corrode and, because of its flexibility, it also offers potential freeze-damage protection.

Residential Commercial Pex Plumbing. Call Toll Free 877-473-7473

Uponor Pex plumbing systems feature PEX-a tubing, which is considered the superior PEX tubing manufacturing method in the industry. PEX-a is the most flexible of all PEX types, and because of its shape and thermal memory, it can use ProPEX expansion fittings which are the only fitting system that actually gets stronger over time – making it highly leak resistant.

1) Repiping in a home begins at the transition point.

2) The transition point is the point where the potable water system enters the building from the exterior of the building.

3) Repiping a potable water system means you totally abandon the existing potable system and replace it with a new system.

4) The first step in repiping your home is masking or “covering” the floors, and this must be completed before the walls are masked off. This overlap “ enveloped ” system allows the plastic sheeting to be rolled up in one continuous motion.

5) Cutting the sheetrock: You will be shocked at how little sheetrock has to be removed for the layout and installation of a new potable water system. A real Pex Plumber is an expert at HVAC, framing, plumbing, and electrical layout, and will lay out the home pex repipe in the most effective route. The better the repiper. the smaller and fewer the drywall holes!

6) A “GREEN REPIPE” potable water system refers to a Pex repipe potable system only – such as UPONOR or ZURN with corrosion resistant fittings. CPVC and copper systems are not green systems.

7) The drywall pieces that are removed must be used in the patching process as each texture is a little different in thickness. This gives you a uniform surface thickness as you start the repair process. Each piece goes back in the hole it came from.

8) Repipe with an approved material. There are currently three main materials used in pex repiping jobs across the US: copper pipe and fittings, CPVC pipe and fittings, and PEX repipe and fittings. (DO NOT USE CPVC, IT IS THE NEXT POLYBUTYLENE)

9) Repipe inspections must be performed by the local building inspectors after the repipe is completed, with the system under full water pressure.

10) The signed inspection card must be given to the homeowner after the PEX repipe inspection is completed.

11) Drywall repair begins after all the necessary backing has been installed. Backing supports the drywall pieces that were removed to access the potable water pipes and accommodate the repiping of a new Pex repipe or copper potable water system.

12) The fiberglass mesh tape must be used 100% of the time.

13) The patches must be pre-filled with quick set patching compound. The compound comes in 18lb bags, and because it is a powder, it must be mixed with water. This locks the perimeter of each patch and will make the area of the patch stronger than it was before the work process began. The reason this is important is that when you close the doors in the house, the walls flex just a little bit, and if you do not perform this method of repair, the patch will fracture over time from the flex/vibration caused by shutting the doors.

14) Do not coat the drywall patches with regular all-purpose joint compound on the repipe patches.This is a common practice and the patches will crack later 100% of the time, even if it’s years later.

15) Coat all the repipe drywall patches with quick set patching compound only. USG will do and you can find it at any home and hardware store, or you will have fractures in the walls at the patch locations.

16) Float all the walls with quick set patching compound and use a 12″ drywall knife and stagger each coat until the walls become smooth and flat. The next step is wet sanding the patches and this must be done if you want the patches to blend in perfectly after the texture is applied. The reason you’ve seen bad patches in the past is that repairmen do not know how to “kill the edges.” This is an old drywall term that means you must do the detail wet sanding work and there is no short cut.

17) Texture to match the existing texture, and this is not as easy as you might think. This is a real art form for the few that know what they are doing. Also, if the texture is spray texture, you must sponge off the overspray for the texture to match. Nothing gives away the location of a patch more than overspray that is painted over and not “killing the edges.”

18) Paint to match the existing paint. All repipe companies color match the same way. They run down to their local hardware store and have the computer color matching done by the man behind the counter. This is beginner color matching. The proper way to color match is hand color matching. First, match the paint sheen. Second, computer match for the base color. Third, tint for color adjustment. Fourth, match the color and sheen after the paint sample has dried. Repeat if necessary. Did you know that the paint color on the wall after it dries will be different than the paint color while it is wet and in the can?

19) If you follow the basic repiping rules, after a very short time you will not be able to point out all the drywall patches from the repair. You will simply forget where the holes were due to the patches receiving the proper floating, texture and painting techniques. Your friends, neighbors, relatives, and even plumbing contractors will not be able to find the patches.

20) This is a basic guideline for a home repipe. and if done, properly you will have a repipe that was done as well as a repipe can be done.

At Integrity Repipe. we provide total abandonment of your existing potable system, and there are never hidden extras, and we don’t hire subcontractors. You’ll receive nothing but the finest, most complete and professional job in the industry. The scope will be for a lead-free and yellow brass -free potable “GREEN SYSTEM” with a full lifetime warranty that covers material and labor.

Contact Your Local Burbank Repiping Company