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Older houses are often cherished for their charm and character. Many that remain standing were built to unique specifications and constructed with materials that are prohibitively expensive in modern construction. For many young people looking to buy their first home, an old house that needs a little extra care is often an attractive option.

However, these houses often conceal a number of problems behind their fancy crown molding and plaster walls. While some of these issues are relatively minor inconveniences, others are ticking time bombs that could cause significant damage. Potential homeowners would be wise to keep in mind a few specific plumbing features that are unfortunately quite common in homes more than a few decades old.

1: Old Pipe Materials

Any home built before the 1990s could potentially feature pipes made from materials that are no longer approved by US building codes. If the home has been renovated within the last few decades, some or all of these pipes were probably replaced, but it’s always recommended to have the home’s plumbing inspected to ensure there are no unexpected surprises the first time a drain clogs.

Older homes could potentially feature three outdated types of pipe:

  • Lead: Most commonly used for sewer lines and water main lines, lead is one of the oldest metals used in piping. Before the development of blast furnaces capable of casting iron, lead was an ideal metal for plumbing because of its malleability and durability. Lead was also used extensively as an additive in the solder used to join copper pipe fittings. Unfortunately, lead is highly toxic, resulting in joint and gastrointestinal pain, irritability, fatigue, and memory loss. It is especially dangerous to children, causing serious problems with physical and mental development. Although the US has restricted the use of lead since the 1920s, it wasn’t banned completely at the national level until Congress amended the Safe Drinking Water Act in 1986.
  • Galvanized: Commonly used for water lines in homes built before the 1960s, galvanized pipe is made of iron and coated with a layer of zinc. Over time, the zinc erodes, leaving the pipe very susceptible to corrosion and breakage. Although they can last as long as 60 years, most of them become clogged with rust long before then. Aging galvanized pipes become so brittle that they usually have to be broken apart to be removed and replaced. For this reason, they are usually replaced piecemeal in older homes, with the relatively intact pipes left in place.
  • Polybutylene: Heralded as the “pipe of the future” when it appeared in the 1970s, polybutylene pipe was introduced as a replacement for copper lines and saw widespread use throughout the 1980s. Unfortunately, the manufacturer was forced to pay out millions of dollars after a class action lawsuit alleging the pipes were defective. Although the manufacturer never acknowledged a defect, oxidants in public water systems caused a chemical reaction with the plastic, leading it to flake, become brittle, and crack. Polybutylene was mostly used in mobile home installations, but any home constructed in the 1980s and early 1990s may have the plastic pipes somewhere. No longer manufactured or rated by US building codes, any existing polybutylene pipes should be replaced before they fail.

2: Pipe Bellies

Pipes installed underneath homes, either buried in the ground or encased in the concrete slab, are affected by the gradual movement and shifting of the house over time. If the pipes shift downwards, they can create a negative slope, or “belly,” that restricts the flow of water and creates pools that accumulate waste or sediment. Left unattended, pipe bellies can cause stoppages or leaks over time.

3: Failing Sewer Lines

Buried and out of sight, no one thinks much about their sewer line until it fails, seeping sewage into the ground or backing foul smelling wastewater up into the home. Sewer lines see heavy use and those in older homes were often built before modern appliances (garbage disposals, dishwashers, etc) and toilets forced more water through them, making them more susceptible to failure, especially if there’s been extensive remodeling. Older homes are also more likely to have issues with sewer lines shifting or being damaged by tree roots.

4: Outdated Fixtures and Connections

Nothing lasts forever. Older homes often have faucets, fixtures, and supply line connections that are nearing the end of their lifespan. Corrosion and general wear and tear can lead to restricted water flow, broken knobs, and leaks that make simply using water in the house an inconvenience at best and an expensive disaster at worse. While many people try to simply “get by” with failing plumbing, things have a way of breaking at the worst possible time. No one wants to return from vacation to find that the rusty water line valve under the sink finally failed, causing hundreds or thousands of dollars in water damage.

5: Bad Repairs

By their very nature, older homes have had plenty of opportunity to develop plumbing problems. It’s not a question of “if” the home has had plumbing repairs, but rather “who” did the repairs. Many old homes feature DIY repairs made by either the homeowner or a handyman rather than a professional plumber. These problems can range from the mundane, such as unsecured pipes or backwards sink traps, to more serious and expensive mistakes, like unsafe water heaters or improperly sloped showers. While some of these repairs are more amusing than anything else, others have the potential to be quite dangerous and should be repaired immediately.

While old homes have their own unique charm, they also present a number of unique problems. Anyone moving into a home built more than thirty years ago should be sure to have a thorough inspection completed by a licensed plumbing contractor who can identify any concerns. A few proactive steps today can head off potentially serious (and expensive) problems in the future.

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Topics: broken sewer line, Tree roots, Pipe Repair, Plumbing Fixtures