Polybutylene and Galvanised: The Plumbing That Scares Lenders

Two pipe materials cause more trouble in an Oklahoma house sale than the rest combined. One is grey plastic installed in enormous quantities between the late nineteen seventies and the mid nineteen nineties. The other is steel pipe with a zinc coating, standard before that and still present in a great many older houses. Neither is dangerous to live with in the way people imagine. Both can complicate a sale considerably.

This article covers how to identify each one yourself, what actually goes wrong with them, why insurers and lenders react the way they do, what a repipe costs, and how to handle it as a seller.

Why anybody cares about a pipe

A buyer is not usually worried about the plumbing itself. The chain runs through insurance. A financed buyer must obtain a homeowner policy in order to close, and if carriers decline to write the house, or write it only with restrictions, the buyer cannot complete, and the sale dies for reasons that have nothing to do with the price you agreed.

The lender does not refuse the pipe. The insurer refuses the pipe, and the lender refuses the uninsured house.

That is the mechanism behind almost every plumbing related deal collapse we see, and it is why a material that has been sitting quietly in the walls for thirty years suddenly becomes urgent at contract stage.

Polybutylene

How to identify it

Look at the pipe where it enters the water heater, at the main shut off, under sinks and at any exposed run in a garage, crawl space or attic.

• Colour. Most commonly grey, sometimes blue, occasionally black. It is plastic rather than metal
• Flexibility. It is semi rigid and bends gently, unlike copper
• Markings. Often stamped with a code beginning PB, commonly PB2110
• Diameter. Frequently half inch or three quarter inch on interior runs
• Era. Broadly houses built or replumbed from the late nineteen seventies to the mid nineteen nineties

What goes wrong

The concern is failure at joints and, in some installations, degradation of the pipe itself, with leaks that appear without warning inside walls and ceilings. The original acetal plastic fittings and the crimp rings used with them attracted particular attention. Later installations using metal fittings are generally regarded as performing better, though views differ and it depends on the specific installation.

The material was the subject of major class action litigation in the United States during the nineteen nineties, and those settlement programmes closed a long time ago. If somebody tells you there is money available to replumb your house under a settlement, treat that with considerable scepticism and check independently.

The insurance position

This is the practical problem. Some carriers decline to write houses with polybutylene supply lines, some write them with exclusions or higher deductibles for water damage, and some do not ask. Positions vary between companies and change, so the only way to know is for the buyer to obtain quotes on the actual address.

A seller can help enormously here by finding out in advance which carriers will write the house, so the buyer is not discovering the problem for the first time with a closing date approaching.

Galvanised steel

How to identify it

• Material. Steel pipe with a dull silver grey zinc coating, magnetic, so a fridge magnet sticks to it. Copper and plastic do not
• Joints. Threaded, with visible screwed couplings and elbows rather than soldered or crimped connections
• Appearance. Frequently rusty or scaled at the threads, and often painted over
• Era. Broadly pre nineteen sixties construction, though it persisted later in some places and is often found in partial runs after piecemeal repairs

What goes wrong

It corrodes from the inside. Mineral scale and rust build up on the interior wall, narrowing the bore over decades until flow is noticeably restricted. The classic symptoms are poor pressure, particularly upstairs and particularly when two fixtures run at once, water that runs brown after the house has been empty, and pinhole leaks at threaded joints where the wall has thinned.

It also fails in a characteristic way during renovation. Old galvanised pipe that has been undisturbed for fifty years frequently starts leaking after somebody works on part of the system, because moving it breaks the scale that was effectively holding it together. Sellers who decide to do a partial repair before listing sometimes find they have committed themselves to a full one.

A note on lead

Galvanised supply piping is not the same thing as a lead service line, and the two get conflated. Questions about lead in drinking water are a public health matter rather than a plumbing preference, and the water utility for your address and a certified testing laboratory are the right places to direct them. Our article on asbestos and lead paint covers the related materials question in older houses.

What else you might find

• Copper. Widely accepted. Pinhole leaks occur in some water conditions, and it is generally the material buyers are happiest to see
• CPVC. Rigid cream or tan plastic, common in some eras and regions, and generally acceptable, though it becomes brittle with age
• PEX. Modern flexible plastic, red, blue or white. Standard in new construction and the usual material for a repipe
• A mixture. Extremely common. Decades of partial repairs leave houses with three or four materials joined together, and the transitions are where leaks concentrate

Working out what you have

You can get most of the way yourself in fifteen minutes with a torch. Look at the water heater connections, the main shut off, under every sink, at the washing machine box, and at any exposed run in a garage, attic or crawl space.

What you cannot see is what is inside the walls, and houses frequently differ from what the visible portions suggest, because previous owners replaced the accessible parts and left the rest. A plumber inspecting the accessible sections and giving you a written opinion is inexpensive and much more useful to a buyer than your own description.

What a repipe costs

Figures vary widely with the size of the house, the number of fixtures, the number of storeys, the construction type and the access, so obtain several written itemised bids.

• A full repipe of a modest single storey house commonly runs into five figures
• Larger houses, two storeys, and houses on slabs where lines have to be re-routed through walls and ceilings run higher
• Drywall repair and repainting is frequently quoted separately, and it is a real cost rather than a rounding error. Ask explicitly whether it is included and to what standard
• Partial repipes are cheaper and leave a house with mixed materials, which some insurers treat the same as no repipe at all

Ask any repipe quote two questions. Does it include drywall and paint, and does it replace all supply lines or only the accessible ones?

Partial repipes and why they disappoint

Replacing the visible runs in a garage and leaving the polybutylene inside the walls produces a house that looks better and answers the insurance question no better, because a carrier asking whether the house has polybutylene supply lines is asking about all of them.

The same applies to galvanised. Replacing the horizontal runs and leaving the risers leaves the pressure problem in place and creates new transition joints. If you are going to spend the money, get a written scope that states exactly what is being replaced and what is being left.

Disclosure and how to handle it selling

Oklahoma places disclosure obligations on residential sellers regarding known defects and known material facts, covered in seller disclosure requirements. Knowing your house has polybutylene and saying nothing while a buyer's insurance falls through is not a strategy.

Three workable approaches:

1. Repipe before listing. Removes the objection entirely, widens the buyer pool, and rarely returns its full cost in price. Makes most sense where the material is already leaking
2. Disclose, document and price it in. Get a plumber's written assessment, get one or two repipe quotes, and hand the file to buyers upfront. A known, quantified number is far less frightening than an unknown one, and it stops a buyer inventing a larger figure during the option period
3. Find out which carriers will write it. Cheap, fast and frequently decisive. If you can tell a nervous buyer that insurance is obtainable and roughly what it costs, most of the problem disappears

What tends to go wrong is discovering the issue at the same time as the buyer, mid contract, with an inspection report and a closing date. Our article on what a home inspector checks covers that sequence, and electrical panels that fail inspection covers the equivalent problem on the electrical side, which behaves almost identically.

Where we come in

We buy houses in Tulsa and the surrounding towns as they are, including houses with polybutylene, galvanised, mixed materials and active leaks. We do not obtain retail homeowner insurance the way a financed buyer does, so the material that ends other sales does not end ours.

The straight version: if the plumbing is the only significant issue and the house is otherwise in good order, repiping and selling on the open market will usually leave you better off than selling to us, and we would rather say so than pretend the maths is different. Where we make sense is when the repipe number is out of reach, when the house has already had water damage from a failure, when the plumbing sits alongside a roof or a foundation on the list, or when a financed sale has already fallen through over insurance and you do not want to go through it again.

We price condition into the offer, we close on Oklahoma title company timelines, and our offer process is free with no obligation.

The short version

• The problem is rarely the pipe itself. It is insurance, and a buyer who cannot insure cannot borrow
• Polybutylene is usually grey, sometimes blue, semi rigid, often stamped PB, and broadly late nineteen seventies to mid nineteen nineties
• PEX is not polybutylene. Confusing the two costs sellers money, so get it confirmed in writing
• Polybutylene class action settlement programmes closed long ago. Treat claims of available funds with scepticism
• Galvanised steel is magnetic, threaded and corrodes from the inside, producing poor pressure and brown water
• Disturbing old galvanised during a partial repair frequently causes new leaks
• Carrier positions on both materials vary and change, so quotes on the actual address are the only real answer
• A full repipe commonly runs into five figures, and drywall and paint are frequently quoted separately
• Partial repipes rarely satisfy an insurer asking whether the house has the material at all
• Finding out which carriers will write the house is cheap and often resolves the whole objection