Best Option for Pipes

Pipe Options

Polyethylene (PE or PEX)

Polyethylene (PEX) is becoming a more popular option. It will leach small amounts of VOCs for some years. Different brands cause different odors and leach different chemicals - this has not been thoroughly researched yet. Precautions you can take are to avoid drinking warm water from the tap or filter your drinking water with RO/carbon or distillation.

The usual fittings are brass which contain lead, though there are plastic PPSU fittings.

When running lines to a tiny house use PEX instead of a garden hose or RV hose. RV hoses are made of PVC.

PEX is not allowed by all local building codes.

Radiant Floors

PEX tubing is also the tubing of choice for radiant floor heating. Radiant Floors are a great heating option, as ducts can pose problems for those sensitive to mould and dust. I prefer electric underfloor heating as I have seen PEX floor heating spring a leak.

With PEX make sure to select the right diameter for your application.

Copper 

Copper can be considered for those extremely sensitive to plastics. However, there are also health risks associated with it. Those with EMF sensitivity are also concerned about copper pipes which can pick up stray electric currents.

Copper can be filtered from drinking water with a reverse osmosis system.

For people very concerned about mould they sometimes run their water lines inside the house. In this case you would use copper.

Copper is more expensive than PEX and more prone to bursting if it freezes.

Use solder without lead.

The fittings are brass which contain lead. Even "lead-free" allows for a small amount of lead. It is in theory possible to have 100% lead-free brass fittings but I have not seen any for copper yet.

PVC or ABS (Outgoing Pipes)

Either one can be used on outgoing water pipes. Your codes may require one or the other.

Make sure that when glue is used at junctures in the pipes it is done outdoors or while the house can be totally aired out. Make sure your contractors are aware of the toxicity of the glue and to be extra careful with spills and clean-up. The glues cure very quickly, however. So they should be tolerable very soon.

Where plumbing meets the wall, it should be sealed with non-toxic caulking.

8 comments:

  1. I don't agree with the copper being toxic. First of all most people are deficient in copper. Secondly, scientists elsewhere have come to the opposite conclusion – that copper prevents rather than promotes Alzheimer's. Commenting on the new study, Christopher Exley, professor in Bioinorganic Chemistry at Keele University in Staffordshire, England, was quoted in news reports suggesting that the amount of copper the Rochester researchers described as being harmful is actually an average, normal amount. In February of 2013, Dr. Exley and his team published a study in which they found what they claimed is "unequivocal evidence that under conditions which are approximately similar to those found in the brain, copper can only protect against beta amyloid forming" and that it is "highly unlikely" that copper is directly involved in forming the plaques characteristic of Alzheimer's.

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    1. Copper can be toxic over time if you get too much of it. Especially if you are a woman with a copper IUD. Copper is convenient and can work well but getting your copper levels checked on a regular basis should be routine if you have copper piping. It can drive down zinc levels if copper is too high. Taking zinc can actually help keep copper levels more balanced in that situation.

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  2. I don't understand how a blog titled, "My Chemical Free House" could possibly promoted plastic drinking water pipes. 100% of the materials used in these pipes are chemicals.

    Copper, although it too has concerns, has been used safely for 100s of years and is of course a material found in the natural world. My feeling is that it is only the solder used to join the pipes that may be problematic. Obviously lead free solder is the best choice here.

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    1. Both have pros and cons, what is natural is not always the best and people will want a choice between those two. I choose PEX.

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  3. As has been pointed out high acidic water causes copper to leach into your drinking water so copper is not benign either

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  4. All brass has lead content. Most or all connectors for copper pipes are brass. All the fittings and fixtures are brass. Most drains are brass with various color coatings. It can leach into the water (the lead). It is crazy that they allow this but they do. Any lead in the water system is too much. So anywhere the pipes join to a joint, water spigot, etc you will see brass. I thought copper was much safer and now I don't know what to do. Maybe get a well and use a bucket. Stainless steel seems like a good idea but that doesn't exist in plumbing.

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